{"id":117482,"date":"2021-03-12T01:10:48","date_gmt":"2021-03-12T09:10:48","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=117482"},"modified":"2021-03-12T01:12:58","modified_gmt":"2021-03-12T09:12:58","slug":"overview-of-dnsmasq-vulnerabilities-the-dangers-of-dns-cache-poisoning","status":"publish","type":"post","link":"https:\/\/unit42.paloaltonetworks.com\/ja\/overview-of-dnsmasq-vulnerabilities-the-dangers-of-dns-cache-poisoning\/","title":{"rendered":"dnsmasq\u306e\u8106\u5f31\u6027\u306e\u6982\u8981: DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u5371\u967a\u6027"},"content":{"rendered":"<h2>\u6982\u8981<\/h2>\n<p>DNS\u30de\u30b9\u30ab\u30ec\u30fc\u30c9(dnsmasq)\u306f\u3001\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306eDNS\u30ea\u30be\u30eb\u30d0\u3067\u3059\u3002\u305d\u306e\u540d\u306b\u805e\u304d\u899a\u3048\u304c\u306a\u304f\u3066\u3082\u3001\u3053\u308c\u306fKubernetes\u304b\u3089\u30eb\u30fc\u30bf\u30fc\u3084\u305d\u306e\u4ed6\u306e\u88fd\u54c1\u306b\u81f3\u308b\u307e\u3067<a href=\"https:\/\/www.jsof-tech.com\/disclosures\/dnspooq\/#DNSPOOQ-scenarios\">\u4e16\u754c\u4e2d\u306e\u591a\u304f\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3084\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30d5\u30a1\u30fc\u30e0\u30a6\u30a7\u30a2\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059<\/a>\u3002<\/p>\n<p>\u9577\u5e74\u306b\u308f\u305f\u308adnsmasq\u306b\u306f<a href=\"https:\/\/access.redhat.com\/security\/vulnerabilities\/3199382\">\u8907\u6570\u306e\u91cd\u5927\u306a\u8106\u5f31\u6027<\/a>\u304c\u767a\u898b\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u6700\u8fd1\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7814\u7a76\u8005\u305f\u3061\u306fdnsmasq\u3092\u8106\u5f31\u306b\u3057\u7d9a\u3051\u308b\u65b0\u305f\u306a\u554f\u984c\u3092<a href=\"https:\/\/www.jsof-tech.com\/disclosures\/dnspooq\/\">\u767a\u898b\u3057\u307e\u3057\u305f<\/a>\u3002\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306f\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3001Denial of Service (\u30b5\u30fc\u30d3\u30b9\u62d2\u5426 - DoS)\u3001\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u30ea\u30e2\u30fc\u30c8\u30b3\u30fc\u30c9\u5b9f\u884c(RCE)\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306f\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u3001dnsmasq\u306e\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u3053\u306e\u3088\u3046\u306a\u554f\u984c\u304cKubernetes\u306a\u3069\u306e\u30af\u30e9\u30a6\u30c9\u88fd\u54c1\u306b\u53ca\u307c\u3059\u5f71\u97ff\u306b\u3064\u3044\u3066\u3082\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u304a\u5ba2\u69d8\u306f\u3001<a href=\"https:\/\/www.paloaltonetworks.com\/network-security\/next-generation-firewall\">\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb<\/a>\u3001<a href=\"https:\/\/www.paloaltonetworks.com\/products\/threat-detection-and-prevention\/dns-security\">DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a>\u3001\u304a\u3088\u3073<a href=\"https:\/\/www.paloaltonetworks.com\/prisma\/cloud\">Prisma Cloud<\/a>\u306b\u3088\u308a\u3001\u3053\u306e\u30d6\u30ed\u30b0\u3067\u6982\u8aac\u3055\u308c\u308b\u653b\u6483\u304b\u3089\u4fdd\u8b77\u3055\u308ct\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>DNS\u306e\u8106\u5f31\u6027\u306e\u80cc\u666f<\/h2>\n<p>\u4ee5\u524d\u306e\u30d6\u30ed\u30b0\u300c<a href=\"https:\/\/unit42.paloaltonetworks.jp\/dns-vulnerabilities\/\">DNS\u306e\u8106\u5f31\u6027\u306e\u6b74\u53f2\u3068\u30af\u30e9\u30a6\u30c9<\/a>\u300d\u3067\u8a73\u3057\u304f\u8aac\u660e\u3057\u305f\u3088\u3046\u306b\u3001\u30dd\u30fc\u30c8\u3068\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304b\u3089\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306b\u6700\u65b0\u306eDNS\u30ea\u30be\u30eb\u30d0\u304c\u4f7f\u7528\u3059\u308b\u91cd\u8981\u306a\u65b9\u6cd5\u306e1\u3064\u3067\u3059\u3002<\/p>\n<p>\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u5fdc\u7b54\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001DNS\u30ea\u30be\u30eb\u30d0\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6c5a\u67d3\uff08\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\uff09\u3059\u308b\u653b\u6483\u3067\u3059\u3002\u3053\u306e\u653b\u6483\u306f\u3001DNS\u30ea\u30be\u30eb\u30d0\u304c\u8981\u6c42\u3092\u4e0a\u4f4d\u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3057\u305f\u5f8c\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u306e\u6642\u70b9\u3067\u3001\u653b\u6483\u8005\u306f\u3001\u88ab\u5bb3\u8005\u306e\u7d44\u7e54\u304c\u63a5\u7d9a\u3057\u305f\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u3088\u3046\u306b\u898b\u3048\u308b\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002DNS\u30ea\u30be\u30eb\u30d0\u306f\u60aa\u610f\u306e\u3042\u308b\u5fdc\u7b54\u3092\u53d7\u4fe1\u3057\u3066\u305d\u308c\u3089\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u305d\u308c\u4ee5\u964d\u3001\u88ab\u5bb3\u8005\u306e\u7d44\u7e54\u304cDNS\u30ea\u30be\u30eb\u30d0\u306b\u3053\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u8981\u6c42\u3059\u308b\u3068\u3001\u653b\u6483\u8005\u306e\u5236\u5fa1\u4e0b\u306b\u3042\u308b\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3067\u5fdc\u7b54\u3057\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u304c\u767a\u751f\u3059\u308b\u3068\u691c\u51fa\u304c\u975e\u5e38\u306b\u56f0\u96e3\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u30e6\u30fc\u30b6\u30fc\u304c\u9280\u884c\u306eWeb\u30b5\u30a4\u30c8\u3092\u53c2\u7167\u3057\u3066URL\u3092\u6b63\u3057\u304f\u5165\u529b\u3057\u305f\u5834\u5408\u3067\u3082\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u306b\u3088\u3063\u3066DNS\u30ea\u30be\u30eb\u30d0\u304c\u9280\u884c\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u3055\u305a\u30e6\u30fc\u30b6\u30fc\u3092\u653b\u6483\u8005\u306eIP\u30a2\u30c9\u30ec\u30b9\u3078\u5411\u3051\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u304c\u3082\u305f\u3089\u3059\u6df1\u523b\u306a\u5f71\u97ff\u306e\u305f\u3081DNS\u306e\u8106\u5f31\u6027\u306f\u91cd\u5927\u306a\u3082\u306e\u304c\u591a\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u653b\u6483\u306b\u5bfe\u3059\u308b\u7de9\u548c\u7b56\u306e1\u3064\u306f\u30ea\u30be\u30eb\u30d0\u304b\u3089\u4e0a\u4f4d\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u8981\u6c42\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u3089\u306e2\u3064\u306e\u5024\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3059\u308b\u3068\u3001\u305d\u308c\u305e\u308c16\u30d3\u30c3\u30c8\u9577\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u5404\u8981\u6c42\u306b\u306f32\u30d3\u30c3\u30c8\u30ad\u30fc\u304c\u3042\u308a\u3001DNS\u30ea\u30be\u30eb\u30d0\u306b\u3088\u3063\u3066\u60aa\u610f\u306e\u3042\u308b\u5fdc\u7b54\u304c\u53d7\u3051\u5165\u308c\u3089\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u653b\u6483\u8005\u304c\u3053\u306e\u30ad\u30fc\u3092\u7167\u5408\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p style=\"text-align: center;\"><em><img width=\"2002\" height=\"898\"  class=\"wp-image-117371 alignnone lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/03\/word-image-43.png\" \/><\/em>\u56f31.DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u306e\u307e\u3068\u3081<\/p>\n<h2>CVE<\/h2>\n<p>dnsmasq\u306b\u306f\u6700\u8fd12\u7a2e\u985e\u306e\u8106\u5f31\u6027\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u306b\u5229\u7528\u53ef\u80fd\u306a\u3001\u691c\u8a3c\u554f\u984c\u306a\u3069\u306eDNS\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u5b9f\u88c5\u306b\u304a\u3051\u308b\u30d0\u30b0<\/p>\n<ul>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25684\">CVE-2020-25684<\/a><\/li>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25685\">CVE-2020-25685<\/a><\/li>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25686\">CVE-2020-25686<\/a><\/li>\n<\/ul>\n<p>DoS\u653b\u6483\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u30d0\u30b0<\/p>\n<ul>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25681\">CVE-2020-25681<\/a><\/li>\n<li><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2020-25682\">CVE-2020-25682<\/a><\/li>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25683\">CVE-2020-25683<\/a><\/li>\n<li><a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-25687\">CVE-2020-25687<\/a><\/li>\n<\/ul>\n<p>\u3053\u308c\u307e\u3067\u306e\u3068\u3053\u308d\u3001\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u8106\u5f31\u6027\u306e\u5f71\u97ff\u306f\u3001DoS\u653b\u6483\u306b\u9650\u5b9a\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u8106\u5f31\u6027\u306e\u6700\u521d\u306e\u30b0\u30eb\u30fc\u30d7\u306f\u3001\u58ca\u6ec5\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u60aa\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u305f\u3081\u672c\u7a3f\u3067\u306f\u3053\u308c\u3089\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n<p>dnsmasq\u306b\u56fa\u6709\u306e\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u8a2d\u8a08\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5b9f\u88c5\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u77e5\u308b\u3053\u3068\u306f\u3001\u6700\u8fd1\u306e\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>CVE-2020-25684: \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306e\u4e0d\u6b63\u5b9f\u884c<\/h2>\n<p>dnsmasq\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u540c\u6642\u306b\u6700\u592764\u30dd\u30fc\u30c8\u307e\u3067\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001dnsmasq\u304c64\u30dd\u30fc\u30c8\u306e\u30aa\u30fc\u30d7\u30f3\u30bd\u30b1\u30c3\u30c8\u3092\u540c\u6642\u306b\u4fdd\u6301\u3057\u3001\u3053\u308c\u3089\u306e\u5404\u30dd\u30fc\u30c8\u30bd\u30b1\u30c3\u30c8\u3067\u5fdc\u7b54\u3092\u5f85\u6a5f\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u9001\u4fe1\u5143\u30dd\u30fc\u30c8(\u958b\u3044\u3066\u3044\u308b64\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b)\u3092\u6b63\u3057\u304f\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u3068\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u304cdnsmasq\u30b5\u30fc\u30d0\u30fc\u4e0a\u3067\u5358\u306b\u30c9\u30ed\u30c3\u30d7\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3088\u3044\u7de9\u548c\u7b56\u306e\u3088\u3046\u306b\u601d\u308f\u308c\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u306e\u554f\u984c\u306f\u3001dnsmasq\u304c\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3068\u7167\u5408\u3057\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u4e8b\u5b9f\u306b\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u3001\u6b63\u78ba\u306a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID<strong>\u3068<\/strong>\u6b63\u78ba\u306a\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3092\u63a8\u6e2c\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u306f\u306a\u304f\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u300164\u500b\u306e\u30dd\u30fc\u30c8\u306e<strong>\u3044\u305a\u308c\u304b<\/strong>\u3060\u3051\u3092\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306b\u3088\u308b\u7de9\u548c\u7b56\u306e\u5f37\u5ea6\u306f64\u5206\u306e1\u306b\u5f31\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001dnsmasq\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u7279\u5b9a\u306e\u30dd\u30fc\u30c8\u3068\u7167\u5408\u3057\u306a\u3044\u305f\u3081\u3001\u30aa\u30fc\u30d7\u30f3\u8981\u6c42\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c64\u500d\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u306f64\u500b\u306e\u30aa\u30fc\u30d7\u30f3\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b\u306b\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u3053\u3068\u3067\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>dnsmasq\u306f\u5fdc\u7b54\u3068\u8981\u6c42\u3092\u3069\u306e\u3088\u3046\u306b\u7167\u5408\u3059\u308b\u304b<\/h2>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span> (\u8ee2\u9001\u30ec\u30b3\u30fc\u30c9)\u306f\u3001dnsmasq\u3067\u53d7\u4fe1\u3057\u305f\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u5185\u306b\u5b58\u5728\u3057\u306a\u3044\u30ec\u30b3\u30fc\u30c9\u3067\u3042\u308b\u305f\u3081\u3001dnsmasq\u306f\u8981\u6c42\u3092\u4e0a\u4f4d\u30b5\u30fc\u30d0\u30fc\u306b<strong>\u8ee2\u9001<\/strong>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8981\u6c42\u304c\u6e80\u305f\u3055\u308c\u306a\u3044\u9650\u308a\u3001\u3064\u307e\u308a\u3001dnsmasq\u304c\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u8981\u6c42\u306b\u5bfe\u3059\u308b\u5fdc\u7b54\u3092\u307e\u3060\u53d7\u4fe1\u3057\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u3053\u308c\u306f<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3068\u547c\u3070\u308c\u307e\u3059\u3002dnsmasq\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3057\u305f\u3044\u653b\u6483\u8005\u306f\u3001frec\u306b\u5bfe\u3057\u3066\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306f\u3001\u8981\u6c42\u304c\u6e80\u305f\u3055\u308c\u308b\u304b\u3001\u307e\u305f\u306f\u7279\u5b9a\u306e\u6642\u9593\u304c\u7d4c\u904e(\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8)\u3059\u308b\u3068\u3001\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001dnsmasq\u306f\u3001\u5404\u5fdc\u7b54\u3068\u6b63\u3057\u3044<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3092\u3069\u306e\u3088\u3046\u306b\u7167\u5408\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002dnsmasq\u306f\u3001DNS\u30af\u30a8\u30ea\u306e\u8cea\u554f\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30cf\u30c3\u30b7\u30e5\u306e\u307f\u3092\u4fdd\u5b58\u3057\u3001\u6b8b\u308a\u306f\u7834\u68c4\u3057\u307e\u3059\u3002\u5404DNS\u30af\u30a8\u30ea\u306b\u306f\u300c\u8cea\u554f\u300d\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30af\u30a8\u30ea\u304c\u5b9f\u969b\u306e\u8cea\u554f\u3092\u4fdd\u6301\u3059\u308b\u5834\u6240\u3067\u3059\u3002\u4f8b: <span style=\"font-family: 'courier new', courier, monospace;\">where is www.example.com<\/span>\u3002<\/p>\n<p>\u3053\u308c\u304c\u53ef\u80fd\u306a\u306e\u306f\u3001\u5404DNS<strong>\u5fdc\u7b54<\/strong>\u306b\u306f\u5fdc\u7b54\u3057\u3066\u3044\u308b\u8cea\u554f\u3082\u542b\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u8981\u6c42\u3068\u5fdc\u7b54\u306e\u4e21\u65b9\u306b\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u4e21\u30b5\u30a4\u30c9\u3067\u5b8c\u5168\u306b\u540c\u3058\u3067\u3042\u308b\u305f\u3081\u3001\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u306e\u304c\u4fbf\u5229\u3067\u3059\u3002dnsmasq\u306f\u8981\u6c42\u3092\u9001\u4fe1\u3059\u308b<strong>\u524d\u306b<\/strong>\u8cea\u554f\u3092\u30cf\u30c3\u30b7\u30e5\u3057\u3001<strong>\u53d7\u4fe1\u3057\u305f\u5fdc\u7b54<\/strong>\u306e\u8cea\u554f\u3092\u30cf\u30c3\u30b7\u30e5\u3057\u3066\u3001\u305d\u308c\u3092<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3092\u610f\u5473\u3059\u308b\u8cea\u554f\u3068\u7167\u5408\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001\u4e0a\u4f4d\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u53d7\u4fe1\u3057\u305f\u5834\u5408\u306b<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3092\u7167\u5408\u3059\u308b\u305f\u3081\u306ednsmasq\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u7c21\u7565\u5316\u3055\u308c\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">1.0 \u5fdc\u7b54\u306e\u5b9b\u5148\u30dd\u30fc\u30c8\u304c\u30aa\u30fc\u30d7\u30f3\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b\u306b\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">1.1 \u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u5fdc\u7b54\u3092\u30c9\u30ed\u30c3\u30d7\u3057\u307e\u3059<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">2.0 \u30ad\u30fc\u306e\u8a2d\u5b9a = (\u5fdc\u7b54\u306e\u8cea\u554f\u306e\u30cf\u30c3\u30b7\u30e5\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID)<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">3.0 \u30ad\u30fc\u3067\u4e00\u81f4\u3059\u308bfrec\u3092\u691c\u7d22\u3057\u307e\u3059<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">3.1 \u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u3001\u5fdc\u7b54\u3092\u30c9\u30ed\u30c3\u30d7\u3057\u307e\u3059<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\">4.0 \u5fdc\u7b54\u3092\u51e6\u7406\u3057\u307e\u3059<\/span><\/p>\n<p>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001dnsmasq\u306f\u540c\u6642\u306b\u6700\u5927150 <span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u307e\u3067\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u6240\u5b9a\u306e\u671f\u9593\u306b150\u306e\u30aa\u30fc\u30d7\u30f3<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u304c\u5b58\u5728\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5404<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306f\u3001\u524d\u8ff0\u3057\u305f64\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u884c\u52d5\u3092\u60aa\u7528\u3059\u308b2\u3064\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3069\u3061\u3089\u3082\u540c\u3058\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u3053\u306e\u4e21\u65b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>CVE-2020-25685: \u5f31\u3044\u30cf\u30c3\u30b7\u30e5\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/h2>\n<p>dnsmasq\u306f\u3001\u30ad\u30fc\u306e\u30cf\u30c3\u30b7\u30e5\u95a2\u6570\u3068\u3057\u3066\u30ab\u30b9\u30bf\u30e0<span style=\"font-family: 'courier new', courier, monospace;\">CRC32<\/span>\u95a2\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u6b8b\u5ff5\u306a\u304c\u3089\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CRC32<\/span>\u306f\u3001<strong>\u6697\u53f7\u5316\u3055\u308c\u305f\u5b89\u5168\u306a<\/strong>\u30cf\u30c3\u30b7\u30e5\u95a2\u6570\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3059\u306a\u308f\u3061\u3001\u5165\u529b\u304c\u7570\u306a\u3063\u3066\u3082\u540c\u3058\u51fa\u529b\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u8cea\u554f\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u7570\u306a\u3063\u3066\u3044\u3066\u3082\u540c\u3058\u51fa\u529b\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u305d\u308c\u3092\u60aa\u7528\u3057\u3066\u3001\u3059\u3079\u3066\u540c\u3058<span style=\"font-family: 'courier new', courier, monospace;\">Custom-CRC32<\/span>\u30cf\u30c3\u30b7\u30e5\u3092\u751f\u6210\u3059\u308b\u7279\u5225\u306a\u30c9\u30e1\u30a4\u30f3\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u30ea\u30b9\u30c8\u3092\u4f7f\u7528\u3057\u3066dnsmasq\u306b150\u500b\u306e\u30af\u30a8\u30ea\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>CVE-2020-25686: \u4fdd\u7559\u4e2d\u306e\u30af\u30a8\u30ea\u304c\u78ba\u8a8d\u3055\u308c\u306a\u3044<\/h2>\n<p>dnsmasq\u306f\u3001\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u8907\u6570\u306e\u30af\u30a8\u30ea\u3092\u8a31\u53ef\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001dnsmasq\u304c\u4efb\u610f\u306e\u8981\u6c42\u306e\u7d50\u679c\u3092\u53d7\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u524d\u306b\u3001\u653b\u6483\u8005\u304c<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306b150\u56de\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3067\u304d\u308b\u3053\u3068\u3068\u3001150\u306e\u30af\u30a8\u30ea\u306b\u5bfe\u3057\u3066150\u306e\u30aa\u30fc\u30d7\u30f3frec\u304c\u5b58\u5728\u3059\u308b\u671f\u9593\u304c\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u304cWeb\u30d6\u30e9\u30a6\u30b6\u304b\u3089\u653b\u6483\u3092\u4ed5\u639b\u3051\u305f\u5834\u5408\u306f\u3001\u6700\u65b0\u306e\u307b\u3068\u3093\u3069\u306eWeb\u30d6\u30e9\u30a6\u30b6\u306f\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u8ffd\u52a0\u306e\u8981\u6c42\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u305f\u3081\u3001\u3053\u306e\u65b9\u6cd5\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u653b\u6483\u8005\u306f\u5c11\u3057\u8907\u96d1\u306a\u3001\u4ee5\u524d\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>\u6210\u679c<\/h2>\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306f\u4e21\u65b9\u3068\u3082\u540c\u3058\u7d50\u679c\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3057\u305f\u3044\u653b\u6483\u8005\u306f\u3001dnsmasq\u304c150\u306e<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3092\u4fdd\u6301\u3057\u3001\u307e\u3063\u305f\u304f\u540c\u3058<strong>\u30cf\u30c3\u30b7\u30e5\u3055\u308c\u305f<\/strong>\u8cea\u554f\u30ad\u30fc\u3001150\u306e\u7570\u306a\u308b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u300164\u306e\u7570\u306a\u308b\u30dd\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u6642\u9593\u67a0\u3067\u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3092\u9078\u629e\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u306f\u3001\u3053\u306e\u6642\u9593\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3057\u3001\u958b\u3044\u3066\u3044\u308b150\u306e<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u304c\u3059\u3079\u3066\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u306b\u3042\u308b\u3068\u304d\u306b\u3001\u305d\u306e\u5c0f\u3055\u306a\u6642\u9593\u67a0\u3067\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u306e\u507d\u306e\u5fdc\u7b54\u306f\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u3082\u884c\u308f\u308c\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u653b\u6483\u8005\u304c\u958b\u3044\u3066\u3044\u308b<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306e\u3044\u305a\u308c\u304b\u3067\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u306f\u3001\u901a\u5e38\u306e\u653b\u6483\u306e150\u500d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u5fdc\u7b54\u304c\u691c\u8a3c\u3055\u308c\u306a\u3044<\/h2>\n<p>dnsmasq\u306f\u4e0a\u4f4dDNS\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u5fdc\u7b54\u3092\u53d7\u4fe1\u3059\u308b\u3055\u3044\u3001\u305d\u308c\u3092\u691c\u8a3c\u3057\u307e\u305b\u3093\u3002\u3053\u3053\u3067\u554f\u984c\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u30ec\u30b3\u30fc\u30c9\u306b\u7cbe\u901a\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b63\u898f\u540d\u307e\u305f\u306f<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u540d\u3092\u5b9f\u969b\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u307e\u305f\u306f\u6b63\u898f\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u306b\u30de\u30c3\u30d7\u3059\u308bDNS\u30ec\u30b3\u30fc\u30c9\u306e\u4e00\u7a2e\u3067\u3059\u3002<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u30ec\u30b3\u30fc\u30c9\u306f\u901a\u5e38\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www<\/span>\u3084<span style=\"font-family: 'courier new', courier, monospace;\">mail<\/span>\u306a\u3069\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u305d\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30db\u30b9\u30c8\u3059\u308b\u30a2\u30c9\u30ec\u30b9\u306b\u30de\u30c3\u30d7\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001CNAME\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30c9\u30e1\u30a4\u30f3<span style=\"font-family: 'courier new', courier, monospace;\">mail.example.com<\/span>\u3092\u30c9\u30e1\u30a4\u30f3<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306b\u30de\u30c3\u30d7\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001dnsmasq\u3067\u306f\u3001CNAME\u30ec\u30b3\u30fc\u30c9\u306e\u5f8c\u306b<strong>\u4efb\u610f\u306e<\/strong><span style=\"font-family: 'courier new', courier, monospace;\">A<\/span>\u30ec\u30b3\u30fc\u30c9\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001dnsmasq\u306f\u305d\u306e\u5fdc\u7b54\u3092\u691c\u8a3c\u305b\u305a\u306b\u3001\u4fe1\u983c\u3059\u308b\u306e\u307f\u3067\u3059\u3002\u305d\u308c\u3089\u306e<span style=\"font-family: 'courier new', courier, monospace;\">A<\/span>\u30ec\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u8ab0\u3082\u5c0b\u306d\u306a\u304b\u3063\u305f\u305f\u3081\u3001dnsmasq\u306f\u305d\u308c\u3089\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8ee2\u9001\u3057\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b\u3001\u6307\u5b9a\u3055\u308c\u305f\u3059\u3079\u3066\u306e<span style=\"font-family: 'courier new', courier, monospace;\">A<\/span>\u30ec\u30b3\u30fc\u30c9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3060\u3051\u3067\u3059\u3002\u305d\u308c\u3060\u3051\u3067\u306f\u306a\u304f\u3001dnsmasq\u306f\u3059\u3067\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u308b\u30a2\u30c9\u30ec\u30b9\u3082\u4e0a\u66f8\u304d\u3057\u307e\u3059\u3002\u4f8b:<\/p>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">www.example.com\u00a0 CNAME\u00a0 www.bank[.]com<\/span><\/p>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">www.bank[.]com\u00a0 \u00a0 \u00a0A\u00a0 \u00a0 \u00a0 13.37.13[.]37<\/span><\/p>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001dnsmasq\u304c<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306b\u5bfe\u3059\u308b\u30aa\u30fc\u30d7\u30f3\u8981\u6c42\u306b\u5bfe\u3059\u308b\u5fdc\u7b54\u3092\u53d7\u4fe1\u3057\u3001\u653b\u6483\u8005\u304c\u6b63\u3057\u3044\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3092\u53d6\u5f97\u3057\u305f\u5834\u5408\u3001\u4ee5\u524d\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u306eTTL (Time to Live)\u306b\u95a2\u4fc2\u306a\u304f\u3001dnsmasq\u306f<span style=\"font-family: 'courier new', courier, monospace;\">www.bank[.]com<\/span>\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u308b\u30a2\u30c9\u30ec\u30b9\u3092\u4e0a\u66f8\u304d\u3057\u307e\u3059\u3002\u4eca\u5f8c\u3001\u9280\u884c\u306eWeb\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u7d44\u7e54\u306f\u3001\u653b\u6483\u8005\u304c\u7ba1\u7406\u3059\u308bWeb\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u304a\u304b\u3057\u306a\u8a71\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u3046\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002dnsmasq\u304c<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u306e\u5f8c\u306e\u3059\u3079\u3066\u306e\u884c\u3092\u691c\u8a3c\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5927\u5e45\u306b\u4f4e\u4e0b\u3059\u308b\u304b\u3089\u3067\u3059\u3002<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u5fdc\u7b54\u306e\u5404\u30c9\u30e1\u30a4\u30f3\u306b\u63a5\u7d9a\u3057\u3001\u6307\u5b9a\u3055\u308c\u305fA\u30ec\u30b3\u30fc\u30c9\u304c\u5b9f\u969b\u306b\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u306e\u6982\u5ff5\u5168\u4f53\u304c\u5197\u9577\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u305d\u306e\u4ee3\u308f\u308a\u306b\u3001dnsmasq\u306f\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306e\u7de9\u548c\u7b56\u306b\u6253\u3061\u52dd\u3064\u3053\u3068\u306f\u307b\u307c\u4e0d\u53ef\u80fd\u3067\u3042\u308b\u3068\u3044\u3046\u524d\u63d0\u306b\u7acb\u3063\u3066\u3001\u5fdc\u7b54\u306e\u9001\u4fe1\u5143\u3092\u4fe1\u983c\u3057\u307e\u3059\u3002<\/p>\n<h2>\u653b\u6483\u30b7\u30ca\u30ea\u30aa\u306e\u8aac\u660e<\/h2>\n<h3>\u7406\u8ad6<\/h3>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u306b\u306f\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3092\u6b63\u3057\u304f\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u901a\u5e38\u3001\u3053\u308c\u306f32\u30d3\u30c3\u30c8\u30ad\u30fc\u3092\u63a8\u6e2c\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30dd\u30fc\u30c8\u306b16\u30d3\u30c3\u30c8\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306b16\u30d3\u30c3\u30c8\u3067\u3059\u3002<\/p>\n<p>\u4eca\u307e\u3067\u793a\u3057\u3066\u304d\u305f\u3088\u3046\u306b\u3001CVE-2020-25684\u306f\u653b\u6483\u8005\u304c\u6b63\u3057\u3044\u30dd\u30fc\u30c8\u306b\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u309264\u500d\u9ad8\u3081\u308b\u3053\u3068\u3067\u653b\u6483\u8005\u3092\u652f\u63f4\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30ad\u30fc\u306e\u30dd\u30fc\u30c8\u90e8\u5206\u306f<span style=\"font-weight: 400;\">16-<em>lo<\/em><\/span><em><span style=\"font-weight: 400;\">g<\/span><\/em><sub><span style=\"font-weight: 400;\">2<\/span><\/sub><span style=\"font-weight: 400;\">64=10<\/span>\u30d3\u30c3\u30c8\u9577\u306b\u524a\u6e1b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u30ad\u30fc\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u30ad\u30fc\u306e\u9577\u3055\u306f\u307e\u306026\u30d3\u30c3\u30c8\u3067\u3059\u3002\u3053\u308c\u307e\u3067\u306e\u3068\u3053\u308d<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u3067\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u306f1\u56de\u306e\u5fdc\u7b54\u30671\uff5e<span style=\"font-weight: 400;\">2<\/span><sup><span style=\"font-weight: 400;\">26 <\/span><\/sup><span style=\"font-weight: 400;\">= <\/span><span style=\"font-weight: 400;\">67,108,864<\/span>\u3067\u3059\u3002<\/p>\n<p>CVE-2020-25685\u307e\u305f\u306fCVE-2020-25686\u306e\u3044\u305a\u308c\u304b\u3092\u4f7f\u7528\u3057\u3066\u3001\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u307e\u305f\u306f\u7279\u5225\u306a\u30ea\u30b9\u30c8\u3092\u6301\u3061\u3001\u540c\u3058\u8cea\u554f\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u6301\u3064150\u4ef6\u306e\u8981\u6c42\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6b63\u3057\u3044<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306b\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c150\u500d\u9ad8\u304f\u306a\u308b\u3068\u7d50\u8ad6\u4ed8\u3051\u307e\u3057\u305f\u3002\u3053\u308c\u3092CVE-2020-25684\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306b<span style=\"font-weight: 400;\">64 * <\/span><span style=\"font-weight: 400;\">150 = 9,600<\/span>\u500d\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u307e\u3067\u306e\u3068\u3053\u308d<span style=\"font-family: 'courier new', courier, monospace;\">frec<\/span>\u306b\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u53ef\u80fd\u6027\u306f1\uff5e<span style=\"font-weight: 400;\">2<\/span><sup><span style=\"font-weight: 400;\">32<\/span><\/sup><span style=\"font-weight: 400;\">\/<\/span><span style=\"font-weight: 400;\">9600 <\/span><span style=\"font-weight: 400;\">= <\/span><span style=\"font-weight: 400;\">447,392<\/span>\u500d\u3067\u3059\u3002<\/p>\n<p>\u3082\u30461\u3064\u306e\u554f\u984c\u306f\u3001\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3092\u884c\u3046\u306b\u306f\u3001<strong>\u901a\u5e38<\/strong>\u3001\u653b\u6483\u8005\u304cDNS\u30a8\u30f3\u30c8\u30ea\u306eTime to Live\u5024\u304c\u671f\u9650\u5207\u308c\u306b\u306a\u308b(\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u524a\u9664\u3055\u308c\u308b)\u307e\u3067\u5f85\u3064\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u305d\u3046\u3057\u306a\u3044\u5834\u5408\u3001DNS\u30ea\u30be\u30eb\u30d0\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u306e\u7d50\u679c\u3092\u3059\u3050\u306b\u63d0\u4f9b\u3057\u3001\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306f\u767a\u751f\u3057\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u3001\u5f0a\u793e\u306e\u30b1\u30fc\u30b9\u3067\u306f\u3001\u5fc5\u8981\u306a\u30a8\u30f3\u30c8\u30ea\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3059\u308b\u305f\u3081\u3001\u653b\u6483\u8005\u306f<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u30ec\u30b3\u30fc\u30c9\u3092\u60aa\u7528\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u653b\u6483\u30b7\u30ca\u30ea\u30aa<\/h3>\n<p>\u653b\u6483\u8005\u306f<span style=\"font-family: 'courier new', courier, monospace;\">www.bank[.]com<\/span>\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002\u901a\u5e38\u3001\u3053\u308c\u306b\u306f<span style=\"font-family: 'courier new', courier, monospace;\">www.bank[.]com<\/span>\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u306a\u304f\u306a\u308b\u306e\u3092\u5f85\u3061\u3001\u30dd\u30fc\u30c8\u3092\u6b63\u3057\u304f\u63a8\u6e2c\u3057\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u6b63\u3057\u304f\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u304c\u5b9f\u969b\u306b\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u306f\u3001\u305d\u306e\u5834\u5408\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>DNS\u30ea\u30be\u30eb\u30d0\u304cdnsmasq\u306e\u5834\u5408\u3001\u653b\u6483\u8005\u306f\u6700\u521d\u306e\u90e8\u5206\u3092\u30b9\u30ad\u30c3\u30d7\u3057\u3066\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u5b58\u5728\u3057\u306a\u3044<strong>\u4efb\u610f\u306e<\/strong>\u30c9\u30e1\u30a4\u30f3\u3092\u7167\u4f1a\u3059\u308b\u3060\u3051\u3067\u3059\u3002\u901a\u5e38\u306eA\u30ec\u30b3\u30fc\u30c9\u5fdc\u7b54\u3067\u5fdc\u7b54\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u524d\u8ff0\u306e\u3088\u3046\u306b\u3001\u653b\u6483\u8005\u306f<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u3067\u5fdc\u7b54\u3057\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u306f\u3001\u30dd\u30fc\u30c8\u3068\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID (32\u30d3\u30c3\u30c8\u9577\u306e\u30ad\u30fc)\u3092\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p style=\"text-align: center;\"><em><img width=\"2015\" height=\"677\"  class=\"wp-image-117373 alignnone lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/03\/word-image-44.png\" \/><br \/>\n<\/em>\u56f32.dnsmasq\u306b\u5bfe\u3059\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u3002<\/p>\n<p>\u4e0a\u8a18\u306e\u8106\u5f31\u6027\u3092\u4f7f\u7528\u3057\u3066\u3001\u653b\u6483\u8005\u306f\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u3001\u307e\u305f\u306f\u540c\u3058<span style=\"font-family: 'courier new', courier, monospace;\">custom-CRC32<\/span>\u30cf\u30c3\u30b7\u30e5\u3092\u6301\u3064\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30b9\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001150\u4ef6\u306e\u8981\u6c42\u3092\u767a\u884c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u653b\u6483\u8005\u306f\u63a8\u6e2c\u53ef\u80fd\u306a150\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u6301\u3061\u3001\u305d\u306e\u3046\u3061\u306e1\u3064\u306e\u307f\u306b\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e0a\u8a18\u3067\u8a08\u7b97\u3057\u305f\u3088\u3046\u306b\u3001\u653b\u6483\u8005\u306f\u3053\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5404\u5fdc\u7b54\u3067\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u304c9,600\u500d\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u304c\u507d\u306e\u5fdc\u7b54\u306e1\u3064\u3067\u653b\u6483\u3092\u30d2\u30c3\u30c8\u3055\u305b\u308b\u5834\u5408\u3001dnsmasq\u306f<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span>\u5fdc\u7b54\u3092\u53d7\u4fe1\u3057\u3001\u305d\u306e\u4e2d\u306eA\u30ec\u30b3\u30fc\u30c9\u3092\u3059\u3079\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002<\/p>\n<h3>\u653b\u6483\u304c\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027<\/h3>\n<p><a href=\"https:\/\/unit42.paloaltonetworks.jp\/dns-vulnerabilities\/\">DNS\u306b\u3064\u3044\u3066\u306e\u79c1\u306e\u6700\u65b0\u30d6\u30ed\u30b0<\/a>\u3067\u306f\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u304c\u3055\u307e\u3056\u307e\u306a\u7de9\u548c\u7b56\u3092\u4f7f\u7528\u3057\u3066\u3082\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u306b\u3064\u3044\u3066\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u78ba\u7387\u306e\u8a08\u7b97\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u8a08\u7b97\u306f\u524d\u56de\u3068\u540c\u3058\u3067\u3059\u304c\u3001\u30ad\u30fc\u30b5\u30a4\u30ba\u306f<span style=\"font-weight: 400;\">2<\/span><sup><span style=\"font-weight: 400;\">32 <\/span><\/sup><span style=\"font-weight: 400;\">\/ <\/span><span style=\"font-weight: 400;\">9600 <\/span><span style=\"font-weight: 400;\">= <\/span><span style=\"font-weight: 400;\">447,392<\/span>\u3067\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u304c\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u306b\u306f\u3001150\u500b\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306864\u500b\u306e\u30aa\u30fc\u30d7\u30f3\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b\u306b\u653b\u6483\u304c\u30d2\u30c3\u30c8\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u79c1\u306f\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3055\u308c\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u6982\u5ff5\u5b9f\u8a3c(PoC)\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u6700\u60aa\u306e\u5834\u54085\u5206\u4ee5\u5185\u306b\u3001\u653b\u6483\u304c\u6210\u529f\u3057\u305f\u5834\u5408\u306f\u5e73\u574710\u79d2\u4ee5\u5185\u306b\u793e\u5185\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u304b\u3089dnsmasq\u30ea\u30be\u30eb\u30d0\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/strong><\/p>\n<h2>Kubernetes\u3068OpenShift<\/h2>\n<p>dnsmasq\u306fKubernetes\u306eDNS\u30b5\u30fc\u30d3\u30b9\u3067\u3042\u308bkube-dns\u306e\u4e00\u90e8\u3067\u3059\u3002kube-dns\u30b5\u30fc\u30d3\u30b9\u306f\u3001kube-system\u540d\u524d\u7a7a\u9593\u306ekube-dns\u30dd\u30c3\u30c9\u3067\u5b9f\u884c\u3055\u308c\u308b3\u3064\u306e\u30b3\u30f3\u30c6\u30ca\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>3\u3064\u306e\u30b3\u30f3\u30c6\u30ca\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li>kube-dns: DNS\u30af\u30a8\u30ea\u89e3\u6c7a\u3092\u5b9f\u884c\u3059\u308b\u3001SkyDNS\u3092\u5b9f\u884c\u3059\u308b\u30b3\u30f3\u30c6\u30ca\u3067\u3059\u3002<\/li>\n<li>dnsmasq: SkyDNS\u304b\u3089\u306e\u5fdc\u7b54\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002<\/li>\n<li>sidecar: \u6307\u6a19\u306e\u5831\u544a\u3092\u51e6\u7406\u3057\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u306b\u5fdc\u7b54\u3059\u308b\u30b5\u30a4\u30c9\u30ab\u30fc\u30b3\u30f3\u30c6\u30ca\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u524d\u306f\u3001Kubernetes\u3068OpenShift\u306fDNS\u30b5\u30fc\u30d3\u30b9\u306bkube-dns\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>Kubernetes v1.12\u306e\u6642\u70b9\u3067\u306f\u3001kube-dns\u306b\u7f6e\u304d\u63db\u308f\u308a\u3001CoreDNS\u304c\u63a8\u5968\u3055\u308c\u308bDNS\u30b5\u30fc\u30d0\u30fc\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3054\u4f7f\u7528\u306e\u30af\u30e9\u30b9\u30bf\u304c\u6700\u521d\u306bkube-dns\u3092\u4f7f\u7528\u3057\u3066\u3044\u305f\u5834\u5408\u3001CoreDNS\u3067\u306f\u306a\u304fkube-dns\u3092\u307e\u3060\u4f7f\u7528\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001kube-dns\u306fdnsmasq\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u306e\u8a18\u4e8b\u3067\u8aac\u660e\u3057\u3066\u3044\u308b\u3088\u3046\u306b\u3001dnsmasq\u306f\u5371\u967a\u306a\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002CoreDNS\u306fdnsmasq\u3092\u4f7f\u7528\u3057\u306a\u3044\u305f\u3081\u3001Kubernetes\u306e\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3002<\/p>\n<h3>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/h3>\n<p>dnsmasq\u3092\u4f7f\u7528\u3059\u308bKubernetes\u307e\u305f\u306fOpenShift\u30af\u30e9\u30b9\u30bf\u306f\u3001\u4e0a\u8a18\u306e\u653b\u6483\u306b\u5bfe\u3057\u3066\u8106\u5f31\u306b\u306a\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u30bf\u5168\u4f53\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3059\u308b\u306b\u306f\u3001\u5358\u4e00\u306e\u5c0e\u5165\u74b0\u5883\u3092\u4fb5\u5bb3\u3059\u308b\u3060\u3051\u3067\u5341\u5206\u3067\u3059\u3002\u3082\u30461\u3064\u306e\u8003\u3048\u3089\u308c\u308b\u72b6\u6cc1\u3068\u3057\u3066\u306f\u3001\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3060\u3051\u3067\u306a\u304f\u3001\u8aa4\u3063\u3066\u8a2d\u5b9a\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308bdnsmasq\u30de\u30b7\u30f3\u304c\u3042\u308a\u307e\u3059\u3002DNS\u30ea\u30be\u30eb\u30d0\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u3068\u3001\u30dc\u30c3\u30c8\u304c\u30d1\u30d6\u30ea\u30c3\u30afIP\u3092\u30b9\u30ad\u30e3\u30f3\u3057\u3066\u691c\u51fa\u3057\u3084\u3059\u304f\u306a\u308b\u305f\u3081\u3001\u3053\u306e\u30b7\u30ca\u30ea\u30aa\u306f\u3055\u3089\u306b\u60aa\u5316\u3057\u307e\u3059\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306f\u3001\u9577\u5e74\u306b\u308f\u305f\u3063\u3066\u8ffd\u52a0\u3055\u308c\u3066\u304d\u305f\u3042\u3089\u3086\u308b\u7de9\u548c\u7b56\u304c\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304c\u3001\u4eca\u65e5\u306e\u554f\u984c\u306b\u76f4\u7d50\u3057\u3066\u3044\u308b\u7406\u7531\u3092\u518d\u5ea6\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u3082\u3001\u6700\u8fd1\u3067\u306f\u3001\u5b89\u5168\u306a\u30d6\u30e9\u30a6\u30b8\u30f3\u30b0\u3068\u8a3c\u660e\u66f8\u306e\u4f7f\u7528\u306b\u3088\u308a\u3001\u653b\u6483\u8005\u304c\u30c9\u30e1\u30a4\u30f3\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3057\u305f\u3068\u3057\u3066\u3082\u3001\u8a3c\u660e\u66f8\u304c\u4e00\u81f4\u3057\u306a\u3044\u305f\u3081\u3001\u88ab\u5bb3\u8005\u306e\u7d44\u7e54\u306e\u30d6\u30e9\u30a6\u30b6\u304c\u30da\u30fc\u30b8\u3092\u30ed\u30fc\u30c9\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u9ad8\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u6280\u8853\u306f\u3001ISP\u306eDNS\u30ea\u30be\u30eb\u30d0\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3057\u3001\u5b58\u5728\u3057\u306a\u3044IP\u30a2\u30c9\u30ec\u30b9\u306b\u8981\u6c42\u3092\u8ee2\u9001\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u5de8\u5927\u306aDoS\u653b\u6483\u306b\u3082\u4f9d\u7136\u3068\u3057\u3066\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30af\u30e9\u30a6\u30c9\u306b\u304a\u3044\u3066\u306f\u3001\u554f\u984c\u306f\u306f\u308b\u304b\u306b\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002\u524d\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001Kuberenetes\u306f\u3001\u5c11\u3057\u524d\u307e\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u306eDNS\u30ea\u30be\u30eb\u30d0\u3068\u3057\u3066dnsmasq\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u73fe\u5728\u3067\u3082\u3001\u30e6\u30fc\u30b6\u30fc\u306fCoreDNS\u306e\u4ee3\u308f\u308a\u306bdnsmasq\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u9078\u629e\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u3001\u653b\u6483\u8005\u304c\u30af\u30e9\u30b9\u30bf\u306eDNS\u30ea\u30be\u30eb\u30d0\u3092\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3059\u308b\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u3068\u306f\u7570\u306a\u308a\u3001\u30af\u30e9\u30a6\u30c9\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u901a\u5e38\u3001\u8a3c\u660e\u66f8\u306e\u691c\u8a3c\u304c\u884c\u308f\u308c\u306a\u3044\u305f\u3081\u3001\u83ab\u5927\u306a\u640d\u5bb3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u304c1\u3064\u306e\u30b3\u30f3\u30c6\u30ca\u306b\u4fb5\u5165\u3059\u308b\u3068\u3001\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u8106\u5f31\u6027\u304c\u306a\u304f\u3066\u3082\u3001\u3053\u306e\u653b\u6483\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u30bf\u5168\u4f53\u306b\u5bb9\u6613\u306b\u5e83\u3052\u3066\u3044\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u3092\u3054\u4f7f\u7528\u306e\u304a\u5ba2\u69d8\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3067\u3053\u306e\u30d6\u30ed\u30b0\u3067\u6982\u8aac\u3057\u305f\u653b\u6483\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306f\u3001\u7591\u308f\u3057\u3044DNS\u30af\u30a8\u30ea\u3084\u7570\u5e38\u306aDNS\u5fdc\u7b54\u3092\u691c\u51fa\u3059\u308b\u3053\u3068\u3067\u3001DNS\u653b\u6483\u3092\u30d6\u30ed\u30c3\u30af\u3067\u304d\u307e\u3059\u3002\u67af\u6e07\u307e\u305f\u306f\u5927\u91cf\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306b\u95a2\u9023\u3059\u308b\u653b\u6483\u306f\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306b\u7d44\u307f\u8fbc\u307e\u308c\u305fDoS\u307e\u305f\u306f\u30be\u30fc\u30f3\u4fdd\u8b77\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3066\u51e6\u7406\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u4fdd\u8b77\u306f\u3001DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u3088\u308bDNS\u306e\u8105\u5a01\u3068\u30a4\u30f3\u30b8\u30b1\u30fc\u30bf\u306e\u30ab\u30d0\u30ec\u30c3\u30b8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001Prisma Cloud\u3092\u3054\u4f7f\u7528\u306e\u304a\u5ba2\u69d8\u306f\u3001\u8106\u5f31\u306a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u95a2\u3057\u3066\u30a2\u30e9\u30fc\u30c8\u3092\u767a\u3059\u308bPrisma Cloud\u30b3\u30f3\u30d4\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u30db\u30b9\u30c8\u3068\u30b3\u30f3\u30c6\u30ca\u306e\u8106\u5f31\u6027\u30b9\u30ad\u30e3\u30ca\u3092\u901a\u3058\u3066\u3001\u3053\u306e\u8105\u5a01\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30d6\u30ed\u30b0\u3067\u8aac\u660e\u3059\u308b\u653b\u6483\u306b\u306f\u3001\u53e4\u3044\u8106\u5f31\u306adnsmasq\u306e\u5c0e\u5165\u74b0\u5883\u306b\u52a0\u3048\u3066\u3001\u6b21\u306e\u3044\u305a\u308c\u304b\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u3092\u5185\u90e8\u304b\u3089DNS\u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3001\u30af\u30e9\u30b9\u30bf\u306e\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4fb5\u5bb3\u3002<\/li>\n<li>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u3001\u8aa4\u3063\u3066\u8a2d\u5b9a\u3055\u308c\u305fDNS\u30ea\u30be\u30eb\u30d0\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u3088\u3046\u306a\u30b7\u30ca\u30ea\u30aa\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001Prisma 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