{"id":109142,"date":"2020-10-14T18:59:42","date_gmt":"2020-10-15T01:59:42","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=109142"},"modified":"2020-10-14T19:22:08","modified_gmt":"2020-10-15T02:22:08","slug":"cve-2020-16898","status":"publish","type":"post","link":"https:\/\/unit42.paloaltonetworks.com\/ja\/cve-2020-16898\/","title":{"rendered":"\u8105\u5a01\u306b\u95a2\u3059\u308b\u60c5\u5831: Microsoft\u306e\u8106\u5f31\u6027 CVE-2020-16898"},"content":{"rendered":"<h2><strong>\u6982\u8981<\/strong><\/h2>\n<p>Microsoft\u306f2020\u5e7410\u6708\u306e\u6708\u4f8b\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\uff08\u300cDNS RA\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\u3068\u547c\u3070\u308c\u308b\uff09IPv6\u30eb\u30fc\u30bf\u30fc \u30a2\u30c9\u30d0\u30bf\u30a4\u30ba\u30e1\u30f3\u30c8 \u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u767a\u898b\u3055\u308c\u305f\u91cd\u5927\u306a\u8106\u5f31\u6027\uff08<a href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2020-16898\">CVE-2020-16898<\/a>\uff09\u306b\u5bfe\u5fdc\u3057\u307e\u3057\u305f\u3002\u672c\u8106\u5f31\u6027\u306fRA\u30d1\u30b1\u30c3\u30c8\u306e\u51e6\u7406\u3092\u62c5\u3046Windows\u306eTCP\/IP\u30b9\u30bf\u30c3\u30af\u306b\u5b58\u5728\u3057\u307e\u3059\u3002\u73fe\u5728\u306e\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u306f\u30ea\u30e2\u30fc\u30c8\u30b3\u30fc\u30c9\u5b9f\u884c\u306e\u53ef\u80fd\u6027\u3092\u4f34\u3046\u30b5\u30fc\u30d3\u30b9\u62d2\u5426\uff08DoS\uff09\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<p>\u672c\u8106\u5f31\u6027\u306f\u3001Windows10\u30d0\u30fc\u30b8\u30e7\u30f31709\u4ee5\u964d\u3067Windows\u306b\u8ffd\u52a0\u3055\u308c\u305fIPv6 RDNSS\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u8907\u6570\u306eWindows\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n<h2><strong>CVE-2020-16898\u306e\u7de9\u548c\u7b56<\/strong><\/h2>\n<p>\u901a\u5e38\u3069\u304a\u308a\u306a\u308b\u3079\u304f\u65e9\u304f\u30b7\u30b9\u30c6\u30e0\u306b\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u9069\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u307e\u3067\u306f\u3001Microsoft\u304c<a href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2020-16898\">\u516c\u958b\u3057\u305f\u3053\u3061\u3089\u306e\u30ac\u30a4\u30c0\u30f3\u30b9<\/a>\u306b\u3057\u305f\u304c\u3046\u3068\u672c\u8106\u5f31\u6027\u3092\u7de9\u548c\u3067\u304d\u307e\u3059\u3002Microsoft\u306e\u516c\u958b\u3057\u305f\u30ac\u30a4\u30c0\u30f3\u30b9\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u306fIPv6 RDNSS\u306e\u7121\u52b9\u5316\u306e\u305f\u3081\u306b\u5b9f\u884c\u3059\u3079\u304d\u624b\u9806\u306e\u6982\u8981\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p>\u7279\u6a29\u6607\u683c\u3057\u305f\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\uff08Administrator\u306a\u3069\u306e\uff09\u304b\u3089\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-family: 'courier new', courier, monospace;\"><span style=\"font-family: georgia, palatino, serif;\">a.<\/span> <span class=\"lang:default decode:true crayon-inline \">netsh int ipv6 sh int<\/span>\u00a0 <\/span><br \/>\n<em>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306b\u3088\u308a<\/em><strong><em>\u3059\u3079\u3066<\/em><\/strong><em>\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af IPv6 \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u5bfe\u5fdc\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3064\u304d\u3067\u4e00\u89a7\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u51fa\u529b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/em><\/p>\n<figure id=\"attachment_109132\" aria-describedby=\"caption-attachment-109132\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-109132 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/\/2020\/10\/word-image-29.png\" alt=\"This gives an example of the output received after using a command to provide a list of all network IPv6 interfaces with the corresponding index numbers. Finding these numbers allows you to disable IPv6 RDNSS, mitigating CVE-2020-16898. \" width=\"900\" height=\"245\" \/><figcaption id=\"caption-attachment-109132\" class=\"wp-caption-text\">\u56f3 1 netsh \u30b3\u30de\u30f3\u30c9\u306e\u51fa\u529b\u7d50\u679c\u306e\u4f8b<\/figcaption><\/figure>\n<p style=\"padding-left: 40px;\">\u00a0b<em>. <\/em><strong>\u5404<\/strong>Idx\u756a\u53f7\u306b\u3064\u3044\u3066\u3001\u30b3\u30de\u30f3\u30c9<span class=\"lang:default decode:true crayon-inline \">netsh int ipv6 set int [Idx number] rabaseddnsconfig=disable<\/span>\u00a0\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u3053\u3053\u3067 <em>[Idx number]<\/em> \u306f\u624b\u9806 a \u306e\u5b9f\u884c\u3067\u5f97\u305f\u5b9f\u969b\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u4e00\u89a7\u3068\u7f6e\u304d\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5404\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306eRDNSS\u6a5f\u80fd\u304c\u7121\u52b9\u306b\u306a\u308a\u3001\u8106\u5f31\u6027\u304c\u7de9\u548c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p style=\"padding-left: 40px;\">c. RDNSS\u304c\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u3001\u4e00\u89a7\u8868\u793a\u3055\u308c\u305fIdx\u756a\u53f7\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\u30b3\u30de\u30f3\u30c9 <span class=\"lang:default decode:true crayon-inline \">netsh int ipv6 sh int [Idx number]<\/span>\u00a0\u3092\u5b9f\u884c\u3057\u307e\u3059\uff08\u3053\u3053\u3067\u3082<em> [Idx number]<\/em> \u306f\u3064\u3069\u5b9f\u969b\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u306b\u7f6e\u304d\u63db\u3048\u3066\u304f\u3060\u3055\u3044\uff09\u3002\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u5bfe\u8c61\u3068\u306a\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u51fa\u529b\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u51fa\u529b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_109134\" aria-describedby=\"caption-attachment-109134\" style=\"width: 801px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-109134 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/\/2020\/10\/word-image-30.png\" alt=\"This gives an example of the output received in the process of verifying that RDNSS is disabled, mitigating CVE-2020-16898. \" width=\"801\" height=\"1107\" \/><figcaption id=\"caption-attachment-109134\" class=\"wp-caption-text\">\u56f3 2 netsh\u30b3\u30de\u30f3\u30c9\u3067RDNSS\u306e\u5024\u3092\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3055\u3044\u306e\u51fa\u529b\u4f8b<\/figcaption><\/figure>\n<p>* \u305d\u308c\u305e\u308c\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u3064\u3044\u3066<em>RA Based DNS Config (RFC 6106) \u3092<\/em><strong><em>\u7121\u52b9\u5316<\/em><\/strong><em>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/em><\/p>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e<a href=\"https:\/\/www.paloaltonetworks.jp\/products\/secure-the-network\/subscriptions\/threat-prevention\">\u8105\u5a01\u9632\u5fa1<\/a>\u306f\u3001\u30af\u30e9\u30a6\u30c9\u914d\u4fe1\u578b\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3\u3067\u672c\u8106\u5f31\u6027\u306e\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u306b\u5bfe\u3059\u308b\u4fdd\u8b77\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5f0a\u793e<a href=\"https:\/\/www.paloaltonetworks.jp\/network-security\/next-generation-firewall.html\">\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb<\/a>\u3067\u8105\u5a01\u9632\u5fa1\u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3\u3092\u5229\u7528\u3057\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3063\u3066\u904b\u7528\u3055\u308c\u3066\u3044\u308b\u304a\u5ba2\u69d8\u306f\u3001\u672c\u8106\u5f31\u6027\u306e\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u95a2\u9023\u8105\u5a01ID\u306f59240\u3067\u3059\u3002\u3053\u308c\u306fApplications\u306a\u3089\u3073\u306bThreat\u30b3\u30f3\u30c6\u30f3\u30c4\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u30d0\u30fc\u30b8\u30e7\u30f38330\u3067\u914d\u5e03\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.paloaltonetworks.jp\/cortex\/cortex-xdr.html\">Cortex XDR Pro<\/a>\u3092\u304a\u4f7f\u3044\u306e\u304a\u5ba2\u69d8\u306f\u30b9\u30af\u30ea\u30d7\u30c8\u5b9f\u884c\u6a5f\u80fd\u3092\u6d3b\u7528\u3057\u3066\u7ba1\u7406\u5bfe\u8c61\u74b0\u5883\u306bMicrosoft\u304c\u516c\u958b\u3057\u305f\u7de9\u548c\u7b56\u3092\u5c55\u958b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u3001\u65b0\u3057\u3044\u60c5\u5831\u3084\u63a8\u5968\u4e8b\u9805\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308a\u6b21\u7b2c\u3001\u672c\u7a3f\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 Microsoft\u306f2020\u5e7410\u6708\u306e\u6708\u4f8b\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\uff08\u300cDNS RA\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\u3068\u547c\u3070\u308c\u308b\uff09IPv6\u30eb\u30fc\u30bf\u30fc \u30a2\u30c9\u30d0\u30bf\u30a4\u30ba\u30e1\u30f3\u30c8 \u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u767a\u898b\u3055\u308c\u305f\u91cd\u5927\u306a\u8106\u5f31\u6027\uff08CVE-2020-16898<\/p>\n","protected":false},"author":50,"featured_media":134416,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4469,4432,4470],"tags":[6225,6226,5547],"product_categories":[4346,4442,4448,4456],"coauthors":[614,831],"class_list":["post-109142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilities","category-top-cyberthreats-ja","category-vulnerabilities-ja","tag-bad-neighbor-ja","tag-cve-2020-16898","tag-microsoft-ja","product_categories-advanced-threat-prevention","product_categories-advanced-threat-prevention-ja","product_categories-cortex-xdr-ja","product_categories-next-generation-firewall-ja"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) 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