{"id":535,"date":"2023-09-07T00:34:40","date_gmt":"2023-09-07T00:34:40","guid":{"rendered":"https:\/\/faq2.areabe.com\/docs\/607100-off-path-tcp%e8%84%86%e5%bc%b1%e6%80%a7%ef%bc%88cve-2016-5696%e3%81%8c%e5%a0%b1%e5%91%8a%e3%81%95%e3%82%8c%e3%81%a6%e3%81%84%e3%81%be%e3%81%99%e3%81%8c%e3%80%81swanstor%e3%81%ab%e5%bd%b1\/"},"modified":"2023-12-04T06:19:51","modified_gmt":"2023-12-04T06:19:51","password":"","slug":"607100-off-path-tcp%e8%84%86%e5%bc%b1%e6%80%a7%ef%bc%88cve-2016-5696%e3%81%8c%e5%a0%b1%e5%91%8a%e3%81%95%e3%82%8c%e3%81%a6%e3%81%84%e3%81%be%e3%81%99%e3%81%8c%e3%80%81swanstor%e3%81%ab%e5%bd%b1","status":"publish","type":"docs","link":"https:\/\/faq.areabe.com\/?docs=607100-off-path-tcp%e8%84%86%e5%bc%b1%e6%80%a7%ef%bc%88cve-2016-5696%e3%81%8c%e5%a0%b1%e5%91%8a%e3%81%95%e3%82%8c%e3%81%a6%e3%81%84%e3%81%be%e3%81%99%e3%81%8c%e3%80%81swanstor%e3%81%ab%e5%bd%b1","title":{"rendered":"607100 off-path TCP\u8106\u5f31\u6027\uff08CVE-2016-5696)\u304c\u5831\u544a\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001SWANStor\u306b\u5f71\u97ff\u306f\u3042\u308a\u307e\u3059\u304b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\noff-path TCP\u8106\u5f31\u6027\uff08CVE-2016-5696)\u306fRFC 5961\u3067\u63d0\u8a00\u3055\u308c\u305fTCP\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30cf\u30c3\u30ad\u30f3\u30b0\u3092\u4f4e\u6e1b\u3055\u305b\u308b\u65b9\u5f0f\u3067\u3059\u304c\u3001Linux\u306b\u304a\u3051\u308b\u305d\u306e\u5b9f\u88c5\u306b\u554f\u984c\u304c\u6709\u308a\u3001\u6bd4\u8f03\u7684\u7c21\u5358\u306a\u65b9\u6cd5\u3067TCP\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30cf\u30c3\u30ad\u30f3\u30b0\u304c\u53ef\u80fd\u3068\u306a\u308b\u3068\u3044\u3046\u554f\u984c\u3067\u3001\u30ab\u30ea\u30d5\u30a9\u30eb\u30cb\u30a2\u5927\u5b66\u30ea\u30d0\u30fc\u30b5\u30a4\u30c9\u6821\u306eYue Cao\u6c0f\u3089\u306b\u3088\u3063\u3066\u5831\u544a\u3055\u308c\u305f\u3082\u306e\u3067\u3059\u3002<em><\/em>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\nTCP\u30cf\u30c3\u30ad\u30f3\u30b0\u3068\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304c\u3001\u901a\u4fe1\u4e2d\u306eTCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3001\u6709\u52b9\u306a\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3092\u6307\u5b9a\u3057\u305f\u30d1\u30b1\u30c3\u30c8\u306b\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u3092\u5165\u308c\u3066\u9001\u308a\u3064\u3051\u3001\u30b7\u30b9\u30c6\u30e0\u3092\u30af\u30e9\u30c3\u30ad\u30f3\u30b0\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\nRFC 5961\u4ee5\u524d\u306e\u5b9f\u88c5\u3067\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304c\u901a\u4fe1\u4e2d\u306eTCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3001\u6709\u52b9\u306a\u7bc4\u56f2\u5185\u306b\u3042\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3092\u6307\u5b9a\u3057\u305fTCP\u30d1\u30b1\u30c3\u30c8\uff08TCP SYN)\u3092\u9001\u308b\u3060\u3051\u3067\u305d\u306eTCP\u901a\u4fe1\u3092\u7d42\u4e86\u3055\u305b\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u308c\u3092\u6539\u826f\u3057\u305fRFC 5961\u3067\u306f\u3001TCP\u3000SYN\u3092\u9001\u3063\u3066TCP\u901a\u4fe1\u3092\u7d42\u4e86\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u6c7a\u3081\u3089\u308c\u305f\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u304c\u9001\u3089\u308c\u305f\u5834\u5408\u306e\u307f\u3068\u3057\u3001\u305d\u308c\u4ee5\u5916\u306f\u201dChallenge Ack&#8221;\u3092\u8fd4\u3057\u3066\u6b63\u3057\u3044TCP SYN\u307e\u305f\u306fTCP RST\u3092\u9001\u308b\u3088\u3046\u306b\u4fc3\u3059\u3088\u3046\u306b\u3057\u3066\u3001\u7b2c\u4e09\u8005\u306b\u3088\u308b\u4ecb\u5165\u30ea\u30b9\u30af\u3092\u4e0b\u3052\u3088\u3046\u3068\u8a66\u307f\u305f\u306e\u3067\u3059\u3002\u305f\u3060\u3001\u4ed5\u69d8\u3067\u306f\u901a\u4fe1\u4e2d\u306eTCP\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u5bfe\u3057\u3066TCP SYN\u3092\u53d7\u3051\u53d6\u3063\u305f\u5834\u5408\u3001\u7121\u6761\u4ef6\u3067\u201dChallenge Ack&#8221;\u3092\u8fd4\u3059\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u3066\u3001DoS\u653b\u6483\u306e\u3088\u3046\u306bTCP SYN\u3092\u5927\u91cf\u306b\u53d7\u3051\u53d6\u3063\u305f\u5834\u5408\u306b\u3044\u3061\u3044\u3061&#8221;Challenge Ack&#8221;\u3092\u8fd4\u3057\u3066\u3044\u3066\u306f\u30ea\u30bd\u30fc\u30b9\u306e\u6d6a\u8cbb\u306b\u3064\u306a\u304c\u308a\u304b\u306d\u306a\u3044\u305f\u3081\u3001\uff11\u79d2\u9593\u306b\u8fd4\u3059&#8221;Challenge Ack&#8221;\u306e\u6570\u3092\u30b7\u30b9\u30c6\u30e0\u3067\u6c7a\u3081\u3066\u3044\u3066\u3001\u4eca\u3044\u304f\u3064\u8fd4\u3057\u3066\u3044\u308b\u304b\u3068\u3044\u3046\u30ab\u30a6\u30f3\u30bf\u30fc\u5024\u3092\u4fdd\u6301\u3057\u3066\u7ba1\u7406\u3059\u308b\u3068\u3044\u3046\u5b9f\u88c5\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u304c\u5225\u306e\u554f\u984c\u3092\u767a\u751f\u3055\u305b\u3066\u3057\u307e\u3063\u305f\u3068\u3044\u3046\u306e\u304c\u4eca\u56de\u306e\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u3053\u306e\u554f\u984c\u306b\u3064\u3044\u3066\u66f4\u306b\u8a71\u3092\u9032\u3081\u308b\u524d\u306bSWANStor\u3078\u306e\u5f71\u97ff\u306b\u3064\u3044\u3066\u3067\u3059\u304c\u3001<span style=\"color: rgb(0, 0, 255);\">SSL\u3067\u6697\u53f7\u5316\u3055\u308c\u305fSWANStor\u306e\u901a\u4fe1\u3067\u306f\u3001\u3053\u306e\u554f\u984c\u306e\u5f71\u97ff\u306f\u307b\u3068\u3093\u3069\u3042\u308a\u307e\u305b\u3093\u3002<\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304cTCP\u30cf\u30c3\u30ad\u30f3\u30b0\u306b\u6210\u529f\u3057\u3066\u3082\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u8eab\u304c\u898b\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u3092\u9001\u308a\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3060\u3051\u3067\u3059\u304c\u3001\u305d\u306e\u30b3\u30fc\u30c9\u306fSSL\u901a\u4fe1\u306b\u5bfe\u3057\u3066\u610f\u5473\u306e\u3042\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u5f97\u305a\u3001\u307e\u305fSSL\u901a\u4fe1\u3067\u306fTCP\u3068\u306f\u5225\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3067\u6697\u53f7\u901a\u4fe1\u3092\u7ba1\u7406\u3057\u3066\u3044\u3066\u3001\u305d\u306e\u756a\u53f7\u306f\u4e0a\u8a18\u306e\u65b9\u6cd5\u3067\u306f\u30cf\u30c3\u30ad\u30f3\u30b0\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u7d50\u5c40\u9001\u3089\u308c\u3066\u304d\u305f\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u306f\u3001\u53d7\u4fe1\u5074\u3067\u7121\u8996\u3055\u308c\u5ec3\u68c4\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u305d\u3053\u3067\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306fSWANStor\u30b7\u30b9\u30c6\u30e0\u4ee5\u5916\u306e\u4e00\u822c\u7684\u306a\u30b1\u30fc\u30b9\u3001\u4f8b\u3048\u3070HTTP\/Telnet\/FTP\u306a\u3069\u3001TCP\u306e\u4e0a\u3067\u6697\u53f7\u5316\u3057\u3066\u3044\u306a\u3044\u901a\u4fe1\u3092\u884c\u3063\u3066\u3044\u308b\u5834\u5408\u3078\u306e\u672c\u554f\u984c\u306e\u5f71\u97ff\u3068\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u306e\u5185\u5bb9\u3068\u306a\u308a\u307e\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u4e0a\u8a18\u306e\u3068\u304a\u308a\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u306f\u3001\u901a\u4fe1\u4e2d\u306eTCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3001\u6709\u52b9\u306a\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3092\u6307\u5b9a\u3057\u305f\u30d1\u30b1\u30c3\u30c8\u306b\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u3092\u5165\u308c\u3066\u9001\u308a\u3064\u3051\u3001\u30b7\u30b9\u30c6\u30e0\u3092\u30af\u30e9\u30c3\u30ad\u30f3\u30b0\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u305f\u3081\u306b\u3001TCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3001\u6709\u52b9\u306a\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3068\u3044\u3063\u305f\u60c5\u5831\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002RFC 5961\u304c\u5b9f\u88c5\u3055\u308c\u305f\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u4f8b\u3048\u3070TCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u304c\u73fe\u5728\u901a\u4fe1\u4e2d\u306e\u3082\u306e\u3068\u30de\u30c3\u30c1\u3057\u3066\u3044\u308c\u3070\u3001\u201dChallenge Ack&#8221;\u304c\u5fdc\u7b54\u3055\u308c\u30ab\u30a6\u30f3\u30bf\u30fc\u5024\u304c\u4e00\u3064\u6e1b\u308a\u307e\u3059\u3002\u201dChallenge Ack&#8221;\u306f\u30d1\u30b1\u30c3\u30c8\u306b\u6307\u5b9a\u3057\u305f\u201d\u9001\u4fe1\u8005IP\u201d\u306b\u8fd4\u3055\u308c\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u306b\u306f\u5fdc\u7b54\u3055\u308c\u307e\u305b\u3093\u304c\u3001\u73fe\u5728\u306eLinux\u30ab\u30fc\u30cd\u30eb\u306e\u5b9f\u88c5\u3067\u306f\u30ab\u30a6\u30f3\u30bf\u30fc\u5024\u304c\u30b7\u30b9\u30c6\u30e0\u306b\uff11\u500b\u3068\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304c\u500b\u5225\u306eTCP\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u5f35\u3063\u3066\u304a\u304d\u3001TCP SYN\u3092\u9001\u3063\u3066\u8fd4\u3063\u3066\u304f\u308b\u201dChallenge Ack&#8221;\u3092\u89b3\u5bdf\u3059\u308b\u3053\u3068\u3067\u3001\u653b\u6483\u30bf\u30fc\u30b2\u30c3\u30c8\u304c\u653b\u6483\u30d1\u30b1\u30c3\u30c8\u306b\u5bfe\u3057\u3066\u201dChallenge Ack&#8221;\u3092\u9001\u3063\u305f\u304b\u9001\u3089\u306a\u304b\u3063\u305f\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3064\u307e\u308a\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304c\u6700\u521d\u306b\u9001\u3063\u305f\u3001\u653b\u6483\u30d1\u30b1\u30c3\u30c8\u306eTCP\u306e\u9001\u53d7\u4fe1IP\u3068\u30dd\u30fc\u30c8\u756a\u53f7<span class=\"redactor-invisible-space\">\u304c\u3001<\/span><span class=\"redactor-invisible-space\">\u73fe\u5728\u901a\u4fe1\u4e2d\u306e\u3082\u306e\u3068\u30de\u30c3\u30c1<\/span>\u3057\u3066\u3044\u308b\u306e\u304b\u3069\u3046\u304b\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u540c\u3058\u3088\u3046\u306a\u3084\u308a\u65b9\u3067\u3001\u6709\u52b9\u306a\u30bb\u30c3\u30b7\u30e7\u30f3\u756a\u53f7\u3082\u63a2\u7d22\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u3053\u306e\u554f\u984c\u306fRedHat 6\u4ee5\u4e0a\u306b\u5f71\u97ff\u304c\u3042\u308b\u3088\u3046\u3067\u3059\u3002RedHat 5\u4ee5\u524d\u3042\u308b\u3044\u306fWindows\u3084MacOSX\u306a\u3069\u3067\u306fRFC 5961\u3092\u5b9f\u88c5\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u5f71\u97ff\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u3054\u5229\u7528\u306eLinux\u30ab\u30fc\u30cd\u30eb\u306b\u3088\u3063\u3066\u306fRFC 5961\u3092\u30d0\u30c3\u30af\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u3001RedHat 5\u4ee5\u524d\u3068\u540c\u3058\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30ab\u30fc\u30cd\u30eb\u3067\u3082\u5b9f\u969b\u306b\u306f\u5f71\u97ff\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308b\u3088\u3046\u3067\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\u5f71\u97ff\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306b\u3064\u3044\u3066\u306f\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3067\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\nsysctl -a | egrep net.ipv4.tcp_challenge_ack_limit<span class=\"redactor-invisible-space\"><br><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\">\u3053\u308c\u3067<\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><strong>net.ipv4.tcp_challenge_ack_limit<\/strong> = 100<span class=\"redactor-invisible-space\"><br><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u3001\u3054\u5229\u7528\u306e\u30b7\u30b9\u30c6\u30e0\u306fCVE-2016-5696\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306e100\u3068\u3044\u3046\u6570\u5024\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><br><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u30ab\u30fc\u30cd\u30eb\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u304c\u3001\u305d\u306e\u5834\u5408\u306b\u306f\u30b7\u30b9\u30c6\u30e0\u306e\u518d\u8d77\u52d5\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><br><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u307e\u305f\u3001\u4e0a\u8a18\u653b\u6483\u624b\u6cd5\u306b\u3064\u3044\u3066\u300c\u8fd4\u3063\u3066\u304f\u308b\u201dChallenge Ack&#8221;\u3092\u89b3\u5bdf\u3059\u308b\u3053\u3068\u3067\u3001\u653b\u6483\u30bf\u30fc\u30b2\u30c3\u30c8\u304c\u653b\u6483\u30d1\u30b1\u30c3\u30c8\u306b\u5bfe\u3057\u3066\u201dChallenge Ack&#8221;\u3092\u9001\u3063\u305f\u304b\u9001\u3089\u306a\u304b\u3063\u305f\u304b\u3092\u5224\u65ad\u3059\u308b<span class=\"redactor-invisible-space\">\u300d\u306b\u3064\u3044\u3066\u3001net.ipv4.tcp_challenge_ack_limit\u304c100\u3068\u5c0f\u3055\u3044\u6570\u5024\u306a\u306e\u3067\u3001\u653b\u6483\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u5bfe\u3057\u3066100\u500b\u306e\u653b\u6483\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u308a\u3064\u3051\u308c\u3070\u3001\u60aa\u610f\u306e\u3042\u308b\u7b2c\u4e09\u8005\u304c\u5f15\u304d\u7d9a\u304d\u9001\u308bTCP SYN\u306b\u5bfe\u3057\u3001\u672c\u6765\u8fd4\u3055\u308c\u308b\u3079\u304d\u201dChallenge Ack&#8221;\u304c\u8fd4\u3063\u3066\u3053\u306a\u3044\u3053\u3068\u3092\u89b3\u5bdf\u3059\u308b\u3060\u3051\u3067\u653b\u6483\u306e\u6b63\u3057\u3055\u3092\u5224\u65ad\u3067\u304d\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u3053\u306e\u5024\u3092\u3082\u306e\u3059\u3054\u304f\u5927\u304d\u306a\u5024\u306b\u8a2d\u5b9a\u3057\u306a\u304a\u3059\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u306f\u653b\u6483\u306e\u6210\u5426\u3092\u5224\u65ad\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3068\u3044\u3046\u5bfe\u51e6\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><strong>net.ipv4.tcp_challenge_ack_limit<\/strong> =<span class=\"redactor-invisible-space\"> 999999999<br><\/span><\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u3092\u3001RedHat \uff16\u3042\u308b\u3044\u306f\u305d\u306e\u4e92\u63dbOS\u3067\u3042\u308c\u3070\/etc\/sysctl.conf\u306e\u6700\u5f8c\u306e\u884c\u306b\u8ffd\u52a0\u3057\u3001RedHat 7\u3000\u3042\u308b\u3044\u306f\u305d\u306e\u4e92\u63dbOS\u3067\u3042\u308c\u3070\/etc\/sysctl.d\/\u306bcve-2016-5696.conf\u3068\u3057\u3066\u4fdd\u7ba1\u3057\u307e\u3059\u3002<\/span><\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u305d\u306e\u4e0a\u3067sysctl &#8211;system\u3067\u8a2d\u5b9a\u3092\u53cd\u6620\u3055\u305b\u307e\u3059\u3002<\/span><\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><br><\/span><\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">\u306a\u304a\u3001\u4e0a\u8a18\u306e\u5bfe\u51e6\u6cd5\u3092\u5177\u4f53\u7684\u306b\u5b9f\u65bd\u3055\u308c\u308b\u3070\u3042\u3044\u3001\u5404\u81ea\u306e\u8cac\u4efb\u306b\u304a\u3044\u3066\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/span><\/span><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\"><br><\/span><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<span class=\"redactor-invisible-space\"><br><\/span>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<br>\n<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n<em><br><\/em>\n<\/p>\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>off-path TCP\u8106\u5f31\u6027\uff08CVE-2016-5696)\u306fRFC 5961\u3067\u63d0\u8a00\u3055\u308c\u305fTCP\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30cf\u30c3\u30ad\u30f3\u30b0\u3092\u4f4e\u6e1b\u3055\u305b\u308b\u65b9\u5f0f\u3067\u3059\u304c\u3001Linux\u306b\u304a\u3051\u308b\u305d\u306e\u5b9f\u88c5\u306b\u554f\u984c\u304c\u6709\u308a\u3001\u6bd4\u8f03\u7684\u7c21\u5358\u306a\u65b9\u6cd5\u3067TCP\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30cf [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_crdt_document":"","footnotes":""},"doc_category":[4,11],"doc_tag":[],"class_list":["post-535","docs","type-docs","status-publish","hentry","doc_category-swanstor","doc_category-swanstor-security"],"year_month":"2026-04","word_count":136,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"admin","author_nicename":"areabeblog","author_url":"https:\/\/faq.areabe.com\/?author=1"},"doc_category_info":[{"term_name":"SWANStor\u306b\u95a2\u3059\u308b","term_url":"https:\/\/faq.areabe.com\/?doc_category=swanstor"},{"term_name":"SWANStor\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u95a2\u3059\u308b","term_url":"https:\/\/faq.areabe.com\/?doc_category=swanstor-security"}],"doc_tag_info":[],"_links":{"self":[{"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/docs\/535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=535"}],"version-history":[{"count":1,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/docs\/535\/revisions"}],"predecessor-version":[{"id":779,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=\/wp\/v2\/docs\/535\/revisions\/779"}],"wp:attachment":[{"href":"https:\/\/faq.areabe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=535"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_category&post=535"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/faq.areabe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_tag&post=535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}