{"id":102337,"date":"2019-06-21T07:30:40","date_gmt":"2019-06-21T14:30:40","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=102337"},"modified":"2019-12-17T05:19:58","modified_gmt":"2019-12-17T13:19:58","slug":"tcp-sack-panics-linux-servers","status":"publish","type":"post","link":"https:\/\/unit42.paloaltonetworks.com\/ja\/tcp-sack-panics-linux-servers\/","title":{"rendered":"TCP SACK Panic: Linux \u30ab\u30fc\u30cd\u30eb\u30d1\u30cb\u30c3\u30af\u8106\u5f31\u6027\u306e\u6982\u8aac"},"content":{"rendered":"<h2>\u6982\u8981<\/h2>\n<p><a href=\"https:\/\/access.redhat.com\/ja\/security\/vulnerabilities\/4225311\">Linux \u30b7\u30b9\u30c6\u30e0\u306e\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027<\/a>\u3001<a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2019-11477\">CVE-2019-11477<\/a>\u3001<a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2019-11478\">CVE-2019-11478<\/a>\u3001<a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2019-11479\">CVE-2019-11479<\/a> \u304c\u65b0\u305f\u306b\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306f \u30ab\u30fc\u30cd\u30eb 2.6.29 (2009 \u5e74 3 \u6708\u516c\u958b) \u3068\u305d\u308c\u4ee5\u964d\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u65b0\u3057\u3044 Linux \u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306e\u3059\u3079\u3066\u306b\u5f71\u97ff\u3057\u3001TCP \u3067\u63a5\u7d9a\u3092\u5f85\u3061\u53d7\u3051\u308b\u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u306b\u30ab\u30fc\u30cd\u30eb\u30d1\u30cb\u30c3\u30af\u3092\u5f15\u304d\u8d77\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u8106\u5f31\u6027\u304c\u60aa\u7528\u3055\u308c\u308b\u3068\u3001\u30ea\u30e2\u30fc\u30c8\u304b\u3089\u306e\u653b\u6483\u306b\u3088\u308a\u30b5\u30fc\u30d0\u30fc\u304c\u30b5\u30fc\u30d3\u30b9\u62d2\u5426 (DoS) \u72b6\u614b\u306b\u9665\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u30ea\u30e2\u30fc\u30c8\u304b\u3089\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3055\u308c\u308b\u5fc3\u914d\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306e\u539f\u56e0\u306f TCP SACK (\u9078\u629e\u7684\u78ba\u8a8d\u5fdc\u7b54) \u3068\u6700\u5927\u30bb\u30b0\u30e1\u30f3\u30c8\u30b5\u30a4\u30ba (MSS) \u306e\u5b9f\u88c5\u306b\u3042\u308a\u307e\u3059\u3002\u30ea\u30e2\u30fc\u30c8\u306e\u653b\u6483\u8005\u306f\u3001TCP \u63a5\u7d9a\u306e MSS \u3092\u4e0b\u9650\u3067\u3042\u308b 48 \u30d0\u30a4\u30c8\u306b\u8a2d\u5b9a\u3057\u3001\u6539\u3056\u3093\u3057\u305f SACK \u30d1\u30b1\u30c3\u30c8 \u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u53d7\u4fe1\u5074\u306e\u30bd\u30b1\u30c3\u30c8\u30d0\u30c3\u30d5\u30a1\u3092\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306e Linux \u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d1\u30c3\u30c1\u3092\u30ea\u30ea\u30fc\u30b9\u6e08\u307f\u3067\u3059 (<a href=\"https:\/\/access.redhat.com\/ja\/security\/vulnerabilities\/4225311\">RedHat<\/a>\/<a href=\"https:\/\/wiki.ubuntu.com\/SecurityTeam\/KnowledgeBase\/SACKPanic\">Ubuntu<\/a>\/<a href=\"https:\/\/www.suse.com\/ja-jp\/support\/kb\/doc\/?id=7023928\">openSUSE<\/a>)\u3002\u30b7\u30b9\u30c6\u30e0\u306b\u76f4\u3061\u306b\u30d1\u30c3\u30c1\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u653b\u6483\u3092\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u30eb\u30fc\u30eb\u304b\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u5236\u5fa1\u30dd\u30ea\u30b7\u30fc\u3067\u906e\u65ad\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3053\u306e\u653b\u6483\u306f\u975e\u5e38\u306b\u5358\u7d14\u306a\u305f\u3081\u3001\u5229\u7528\u53ef\u80fd\u306a POC (Proof of Concept) \u653b\u6483\u304c\u3059\u3050\u306b\u51fa\u3066\u304f\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u305d\u3046\u306a\u308c\u3070\u6570\u65e5\u4ee5\u5185\u306b\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30b7\u30b9\u30c6\u30e0\u306e\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u3092\u3082\u304f\u308d\u307f\u3001\u5927\u898f\u6a21\u306a DDoS \u653b\u6483\u304c\u4ed5\u639b\u3051\u3089\u308c\u308b\u3053\u3068\u304c\u4e88\u60f3\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>TCP SACK<\/h3>\n<p><a href=\"https:\/\/access.redhat.com\/ja\/security\/vulnerabilities\/4225311\">RedHat<\/a> \u306f\u3053\u306e\u653b\u6483\u306b\u95a2\u3059\u308b\u8a73\u7d30\u8aac\u660e\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3053\u3053\u3067\u306f\u653b\u6483\u306b\u3064\u3044\u3066\u306e\u7c21\u5358\u306a\u30ec\u30d3\u30e5\u30fc\u3092\u542b\u3081\u308b\u306b\u3068\u3069\u3081\u307e\u3059\u3002TCP SACK \u653b\u6483\u306f\u3001\u9001\u4fe1\u5074 TCP SACK (\u9078\u629e\u7684\u78ba\u8a8d\u5fdc\u7b54) \u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3068\u53d7\u4fe1\u5074\u306e\u6700\u5927\u30bb\u30b0\u30e1\u30f3\u30c8\u30b5\u30a4\u30ba (MSS) \u8a2d\u5b9a\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u5d29\u3059\u3053\u3068\u306b\u3088\u3063\u3066\u53ef\u80fd\u3068\u306a\u308b\u653b\u6483\u3067\u3059\u3002SACK (\u9078\u629e\u7684\u78ba\u8a8d\u5fdc\u7b54) \u306f\u3001\u3069\u306e TCP \u30d1\u30b1\u30c3\u30c8\u304c\u53d7\u4fe1\u5074\u306b\u6b63\u5e38\u306b\u53d7\u3051\u5165\u308c\u3089\u308c\u3001\u3069\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u518d\u9001\u304c\u5fc5\u8981\u304b\u3092\u9001\u4fe1\u5074\u30b7\u30b9\u30c6\u30e0\u306b\u901a\u77e5\u3059\u308b\u305f\u3081\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3059\u3002MSS (\u6700\u5927\u30bb\u30b0\u30e1\u30f3\u30c8\u30b5\u30a4\u30ba) \u306f\u53d7\u4fe1\u5074\u304c\u8a2d\u5b9a\u3059\u308b\u8a2d\u5b9a\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u3069\u308c\u3060\u3051\u306e\u5927\u304d\u3055\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3067\u304d\u308b\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u53d7\u4fe1\u5074\u306e MSS \u304c 48 \u30d0\u30a4\u30c8\u3068\u3044\u3046\u6700\u3082\u4f4e\u3044\u8a2d\u5b9a\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u9001\u4fe1\u5074\u306f\u8981\u6c42\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u3088\u308a\u591a\u304f\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u9001\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u53d7\u4fe1\u5074\u304c\u5927\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8ee2\u9001 (\u305f\u3068\u3048\u3070\u30e1\u30c7\u30a3\u30a2\u30d5\u30a1\u30a4\u30eb\u305d\u306e\u307b\u304b\u306e\u30b5\u30a4\u30ba\u306e\u5927\u304d\u3044\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001) \u3092\u8981\u6c42\u3059\u308b\u3068\u3001\u9001\u4fe1\u5074\u306f\u9001\u4fe1\u3055\u308c\u305f\u30d1\u30b1\u30c3\u30c8\u304c\u6b63\u5e38\u306b\u53d7\u4fe1\u3055\u308c\u3066\u3044\u308b\u304b\u306e\u76e3\u8996\u3092\u958b\u59cb\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u53d7\u4fe1\u5074\u306e MSS \u304c\u4f4e\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3068\u3001\u9001\u4fe1\u5074\u3067\u683c\u7d0d\u53ef\u80fd\u306a SACK \u30ad\u30e5\u30fc\u9577\u306b\u5236\u9650\u304c\u3042\u308b\u305f\u3081\u306b\u4e0d\u5747\u8861\u304c\u767a\u751f\u3057\u3001\u9001\u4fe1\u5074\u306e SACK \u30ad\u30e5\u30fc\u304c\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3046\u3057\u3066\u672a\u9001\u4fe1\u30d1\u30b1\u30c3\u30c8\u306e\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u5927\u304d\u304f\u306a\u308a\u3059\u304e\u308b\u3068\u3001\u30ab\u30fc\u30cd\u30eb\u30d1\u30cb\u30c3\u30af\u306e\u72b6\u614b\u304c\u5f15\u304d\u8d77\u3053\u3055\u308c\u3001\u305d\u306e\u7d50\u679c\u3001\u30b5\u30fc\u30d3\u30b9\u62d2\u5426 (DoS) \u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u5f71\u97ff<\/h3>\n<p>Linux \u30ab\u30fc\u30cd\u30eb 2.6.29 \u4ee5\u964d\u304a\u3088\u3073 TCP \u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3059\u308b\u30aa\u30fc\u30d7\u30f3\u306a\u30dd\u30fc\u30c8\u3092\u6301\u3064\u3059\u3079\u3066\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u3053\u306e\u653b\u6483\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3059\u3002\u672c\u8106\u5f31\u6027\u306b\u3088\u308b\u6f5c\u5728\u7684\u306a\u5f71\u97ff\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u3001Shodan \u3067\u3044\u304f\u3064\u304b\u306e\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3057\u305f\u7d50\u679c\u3092\u56f3 1 \u306b\u793a\u3057\u307e\u3059\u3002\u672c\u7a3f\u57f7\u7b46\u6642\u70b9\u3067\u306f 194 \u4e07 4,975 \u53f0\u306e Linux \u30d9\u30fc\u30b9\u30b5\u30fc\u30d0\u30fc\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u898b\u3064\u304b\u308a\u307e\u3059\u3002\u3046\u3061 54 \u4e07 3,797 \u53f0\u306e\u30b5\u30fc\u30d0\u30fc\u304c 80\/tcp \u3067 HTTP \u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u300115 \u4e07 2,416 \u53f0\u306e\u30b5\u30fc\u30d0\u30fc\u304c 22\/tcp \u3067 sshd \u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u300112 \u4e07 6,143 \u53f0\u306e\u30b5\u30fc\u30d0\u30fc\u304c 443\/tcp \u3067 HTTPS \u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u30b5\u30fc\u30d0\u30fc\u306b\u7279\u5225\u306a\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb \u30eb\u30fc\u30eb\u3084\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u5236\u5fa1\u30dd\u30ea\u30b7\u30fc\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d0\u30fc\u306f\u3059\u3079\u3066\u6f5c\u5728\u7684\u306b\u653b\u6483\u306e\u6a19\u7684\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><img  class=\"aligncenter wp-image-102338 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2019\/12\/word-image-185.png\" alt=\"\u56f3 1 Shodan \u3067\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u516c\u958b\u6e08\u307f Linux \u30b7\u30b9\u30c6\u30e0\" width=\"572\" height=\"235\" srcset=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2019\/12\/word-image-185.png 572w, https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2019\/12\/word-image-185-300x123.png 300w, https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2019\/12\/word-image-185-370x152.png 370w\" sizes=\"(max-width: 572px) 100vw, 572px\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\"><em>\u56f3 1 Shodan \u3067\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u516c\u958b\u6e08\u307f Linux \u30b7\u30b9\u30c6\u30e0<\/em><\/span><\/p>\n<h3>\u5bfe\u7b56\u30fb\u7de9\u548c\u7b56<\/h3>\n<p>\u3053\u306e\u653b\u6483\u306f Linux \u30ab\u30fc\u30cd\u30eb\u30b7\u30b9\u30c6\u30e0\u3092\u6a19\u7684\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30fc\u30b8\u30e7\u30f3 2.6.29 \u4ee5\u964d\u306e\u30ab\u30fc\u30cd\u30eb\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b Linux \u30b7\u30b9\u30c6\u30e0\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u3092\u5229\u7528\u53ef\u80fd\u306a\u6700\u65b0 Linux \u30ea\u30ea\u30fc\u30b9\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c Google Cloud Platform (GCP)\u3001Microsoft Azure\u3001\u305d\u306e\u307b\u304b\u306e Infrastructure as a Service (IaaS) \u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Linux \u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u624b\u9806\u306b\u5f93\u3063\u3066\u3059\u3079\u3066\u306e Linux \u30b7\u30b9\u30c6\u30e0\u3092\u6700\u65b0\u306e\u30ea\u30ea\u30fc\u30b9\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>Amazon \u306f\u4eca\u56de\u78ba\u8a8d\u3055\u308c\u305f SACK Panic \u653b\u6483\u304b\u3089\u306e\u88ab\u5bb3\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u3001\u6b21\u306e\u3082\u306e\u3092\u8b58\u5225\u6e08\u307f\u3067\u3059\u3002<\/p>\n<ul>\n<li>AWS Elastic Beanstalk<\/li>\n<li>Amazon Linux \u304a\u3088\u3073 Amazon Linux 2<\/li>\n<li>Amazon Elastic Compute Cloud (EC2)<\/li>\n<li>Elastic Load Balancing (ELB)<\/li>\n<li>Amazon WorkSpaces (Linux)<\/li>\n<li>Amazon Elastic Container Service for Kubernetes (Amazon EKS)<\/li>\n<li>Amazon ElastiCache<\/li>\n<li>Amazon EMR<\/li>\n<\/ul>\n<p>\u4e0a\u8a18\u306e\u8b58\u5225\u6e08\u307f Amazon \u30b5\u30fc\u30d3\u30b9\u306e\u4e00\u90e8\u306a\u3044\u3057\u5168\u90e8\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3001\u8a72\u5f53\u30b5\u30fc\u30d3\u30b9\u3092\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u66f4\u65b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u4e0a\u8a18\u5404 Amazon \u30b5\u30fc\u30d3\u30b9\u306b\u5bfe\u3057\u3066\u5b9f\u884c\u3059\u3079\u304d\u30a2\u30af\u30b7\u30e7\u30f3\u306e\u7c21\u7565\u4e00\u89a7\u3067\u3059\u3002<\/p>\n<h4><strong>AWS Elastic Beanstalk<\/strong><\/h4>\n<ul>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c Amazon \u306e\u30de\u30cd\u30fc\u30b8\u30c9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u66f4\u65b0\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u308c\u3089\u306e\u30b7\u30b9\u30c6\u30e0\u306f\u9078\u629e\u3057\u305f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u671f\u9593\u4e2d\u306b\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30de\u30cd\u30fc\u30b8\u30c9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u66f4\u65b0\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001\u3053\u3061\u3089\u306e<a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/elasticbeanstalk\/latest\/dg\/environment-platform-update-managed.html\">\u30de\u30cd\u30fc\u30b8\u30c9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u66f4\u65b0<\/a>\u306e\u624b\u9806\u3092\u53c2\u7167\u3057\u3066\u6709\u52b9\u306b\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<h4><strong>Amazon Linux \u304a\u3088\u3073 Amazon Linux 2<\/strong><\/h4>\n<ul>\n<li>\u65b0\u3057\u3044 Linux \u30ab\u30fc\u30cd\u30eb\u304c\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3055\u308c Amazon Linux \u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u5229\u7528\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u5404 EC2 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3001\u30ab\u30fc\u30cd\u30eb\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u53d7\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\nsudo yum update kernel<\/li>\n<\/ul>\n<h4><strong>Amazon Elastic Compute Cloud (EC2)<\/strong><\/h4>\n<ul>\n<li>\u5404 EC2 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5185\u3067\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<br \/>\nsudo yum update kernel<\/li>\n<\/ul>\n<h4><strong>Elastic Load Balancing (ELB)<\/strong><\/h4>\n<ul>\n<li>\u304a\u4f7f\u3044\u306e ELB \u304c Classic Load Balancer \u306a\u3044\u3057 Application Load Balancer \u306e\u5834\u5408\u3001\u307e\u305f\u306f Network Load Balancer (NLB) \u3067 TLS \u30bf\u30fc\u30df\u30cd\u30fc\u30b7\u30e7\u30f3 (TLS \u7d42\u7aef) \u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u5074\u3067\u3068\u304f\u306b\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u3068\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u304a\u4f7f\u3044\u306e Network Load Balancer \u3067 TLS \u30bf\u30fc\u30df\u30cd\u30fc\u30b7\u30e7\u30f3\u3092\u5229\u7528\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001Linux \u30d9\u30fc\u30b9\u306e EC2 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30ab\u30fc\u30cd\u30eb\u306b\u30d1\u30c3\u30c1\u3092\u9069\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/AWSEC2\/latest\/UserGuide\/install-updates.html\">\u3053\u3061\u3089<\/a>\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044 (2019-06-27 08:00 \u4fee\u6b63\u66f4\u65b0)\u3002<\/li>\n<\/ul>\n<h4><strong>Amazon WorkSpaces (Linux)<\/strong><\/h4>\n<ul>\n<li>\u65b0\u3057\u3044 Linux WorkSpaces \u306f\u3059\u3079\u3066\u81ea\u52d5\u7684\u306b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3055\u308c\u308b\u305f\u3081\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3088\u308b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u4e0d\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n<h4><strong>Amazon Elastic Container Service for Kubernetes (Amazon EKS)<\/strong><\/h4>\n<ul>\n<li>\u73fe\u5728\u5b9f\u884c\u4e2d\u306e\u3059\u3079\u3066\u306e EKS \u30af\u30e9\u30b9\u30bf\u306f\u3053\u306e\u653b\u6483\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3059\u3079\u3066\u306e\u30ef\u30fc\u30ab\u30fc\u30ce\u30fc\u30c9\u3092\u7f6e\u304d\u63db\u3048\u3001\u6700\u65b0\u306e EKS \u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h4><strong>Amazon ElastiCache<\/strong><\/h4>\n<ul>\n<li>ElastiCache VPC \u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044 TCP \u63a5\u7d9a\u3092\u53d7\u3051\u5165\u308c\u306a\u3044\u305f\u3081\u3001\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3002<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u306e ElastiCache VPC \u8a2d\u5b9a\u304b\u3089\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001ElastiCache \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b0\u30eb\u30fc\u30d7\u304c AWS \u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3001\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8a73\u7d30\u306f Amazon \u306e <a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/AmazonElastiCache\/latest\/red-ug\/VPCs.html\">Amazon VPC \u3068 ElastiCache \u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b VPC \u5916\u3067\u5b9f\u884c\u4e2d\u306e ElastiCache \u304c\u3042\u308a\u3001ElastiCache \u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\u304b\u3089\u5909\u66f4\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001ElastiCache \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b0\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u69cb\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8a73\u7d30\u306f Amazon \u306e<a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/AmazonElastiCache\/latest\/red-ug\/SecurityGroups.html\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b0\u30eb\u30fc\u30d7: EC2-Classic<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<h4><strong>Amazon EMR<\/strong><\/h4>\n<ul>\n<li>Amazon EMR \u306f\u3001Linux \u3092\u5b9f\u884c\u3057\u3066\u3044\u308b EC2 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e VPC \u5185\u3067\u8d77\u52d5\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044 TCP \u63a5\u7d9a\u3092\u53d7\u3051\u5165\u308c\u306a\u3044\u305f\u3081\u3001\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3002<\/li>\n<li>EMR VPC \u306e\u8a2d\u5b9a\u3092\u5909\u66f4\u3057\u305f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3042\u308b\u5834\u5408\u306f AWS \u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3001\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8a73\u7d30\u306f Amazon \u306e<a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/emr\/latest\/ManagementGuide\/emr-security-groups.html\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b0\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u5236\u5fa1\u3059\u308b<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>AWS \u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3063\u305f EMR \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b0\u30eb\u30fc\u30d7\u3092\u8a2d\u5b9a\u3057\u306a\u3044\u3053\u3068\u3092\u9078\u629e\u3057\u305f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u5f93\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\n<ul>\n<li>\u65b0\u3057\u3044\u30af\u30e9\u30b9\u30bf - EMR \u30d6\u30fc\u30c8\u30b9\u30c8\u30e9\u30c3\u30d7\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066 Linux \u30ab\u30fc\u30cd\u30eb\u3092\u66f4\u65b0\u3057\u3001\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u518d\u8d77\u52d5\u3057\u307e\u3059\u3002\u8a73\u7d30\u306f Amazon \u306e<a href=\"https:\/\/docs.aws.amazon.com\/ja_jp\/emr\/latest\/ManagementGuide\/emr-plan-bootstrap.html\">\u8ffd\u52a0\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u305f\u3081\u306e\u30d6\u30fc\u30c8\u30b9\u30c8\u30e9\u30c3\u30d7\u30a2\u30af\u30b7\u30e7\u30f3\u306e\u4f5c\u6210<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u30bf - \u30af\u30e9\u30b9\u30bf\u5185\u306e\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067 Linux \u30ab\u30fc\u30cd\u30eb\u3092\u66f4\u65b0\u3057\u3001\u4e00\u5ea6\u306b 1 \u3064\u305a\u3064\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u518d\u8d77\u52d5\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u672c\u8106\u5f31\u6027\u306f\u3001\u4ed5\u7d44\u307f\u304c\u5358\u7d14\u3067\u6df1\u523b\u5ea6\u304c\u9ad8\u3044\u305f\u3081\u3001\u6570\u65e5\u4ee5\u5185\u306b\u5927\u898f\u6a21\u306a DDoS \u653b\u6483\u304c\u78ba\u8a8d\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3082\u4e0d\u601d\u8b70\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Linux \u30ab\u30fc\u30cd\u30eb\u3092\u3067\u304d\u308b\u3060\u3051\u65e9\u304f\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u30d1\u30d6\u30ea\u30c3\u30af\u30af\u30e9\u30a6\u30c9\u3067\u5b9f\u884c\u4e2d\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u516c\u958b\u3057\u3066 TCP \u30b5\u30fc\u30d3\u30b9\u3092\u30aa\u30fc\u30d7\u30f3\u306b\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u76f4\u3061\u306b\u30d1\u30c3\u30c1\u3092\u9069\u7528\u3059\u308b\u304b\u3001\u5c11\u306a\u304f\u3068\u3082\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb \u30eb\u30fc\u30eb\u3092\u8a2d\u5b9a\u3057\u3066\u653b\u6483\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u6975\u3081\u3066\u91cd\u8981\u3067\u3059\u3002\u7ba1\u7406\u8005\u306f\u672c\u7a3f\u3067\u63d0\u4f9b\u3057\u305f\u5bfe\u7b56\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u6d3b\u7528\u3057\u3066\u30b7\u30b9\u30c6\u30e0\u3092\u4fdd\u8b77\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u66f4\u65b0\u5c65\u6b74<\/h2>\n<ul>\n<li>2019-06-27 08:00 Elastic Load Balancing (ELB) \u306e\u4fee\u6b63\u624b\u9806\u306b\u3064\u3044\u3066\u306e\u8aa4\u308a\u3092\u4fee\u6b63\u3057\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 Linux \u30b7\u30b9\u30c6\u30e0\u306e\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027\u3001CVE-2019-11477\u3001CVE-2019-11478\u3001CVE-2019-11479 \u304c\u65b0\u305f\u306b\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u8106\u5f31\u6027\u306f \u30ab\u30fc\u30cd\u30eb 2.6.29 (2009 \u5e74 3 <\/p>\n","protected":false},"author":23,"featured_media":134410,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4469,4436,4428,4470],"tags":[4537,4623,6643,6645,6647,6595,4553,5849,6648],"product_categories":[],"coauthors":[1025],"class_list":["post-102337","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilities","category-cloud-cybersecurity-research-ja","category-threat-research-ja","category-vulnerabilities-ja","tag-aws-ja","tag-azure-ja","tag-cve-2019-11477-ja","tag-cve-2019-11478-ja","tag-cve-2019-11479-ja","tag-gcp-ja","tag-linux-ja","tag-public-cloud-ja","tag-sack"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>TCP SACK Panic: Linux 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