{"id":93444,"date":"2021-12-19T10:00:09","date_gmt":"2021-12-19T01:00:09","guid":{"rendered":"https:\/\/softantenna.com\/blog\/?p=93444"},"modified":"2021-12-19T10:00:09","modified_gmt":"2021-12-19T01:00:09","slug":"log4j-2-17-0","status":"publish","type":"post","link":"https:\/\/softantenna.com\/blog\/log4j-2-17-0\/","title":{"rendered":"Log4j 2.17.0\u304c\u30ea\u30ea\u30fc\u30b9 -  Log4j\u306e3\u756a\u76ee\u306eDoS\u8106\u5f31\u6027CVE-2021-45105\u306b\u5bfe\u51e6"},"content":{"rendered":"<p><img decoding=\"async\" style=\"display:block; margin-left:auto; margin-right:auto;\" src=\"https:\/\/softantenna.com\/blog\/wp-content\/uploads\/2021\/12\/s_20211219_91943.jpg\" alt=\"S 20211219 91943\" title=\"s_20211219_91943.jpg\" border=\"0\" width=\"860\" height=\"560\" \/><\/p>\n<p>Apple\u958b\u767a\u30c1\u30fc\u30e0\u304c\u3001\u300c<a href=\"https:\/\/logging.apache.org\/log4j\/2.x\/index.html\">Apache Log4j<\/a>\u300d\u306e\u6700\u65b0\u7248v2.17.0\u3092\u516c\u958b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u5148\u65e5\u3088\u308a\u8a71\u984c\u3068\u306a\u3063\u3066\u3044\u308bLog4j\u306e\u8106\u5f31\u6027\u306fv2.16.0\u3067\u4fee\u6b63\u3055\u308c\u3066\u3044\u308b\u306f\u305a\u3067\u3057\u305f\u304c\u30012.16.0\u306b\u3082DoS\u8106\u5f31\u6027(CVE-2021-45105)\u304c\u767a\u898b\u3055\u308c\u3001\u3053\u308c\u306b\u5bfe\u51e6\u3059\u308b\u3082\u306e\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Apache\u306b\u3088\u308b\u3068\u3001Log4j\u306e\u30d0\u30fc\u30b8\u30e7\u30f32.0-alpha1\u304b\u30892.16.0\u306b\u306f\u3001\u81ea\u5df1\u53c2\u7167\u306b\u3088\u308b\u5236\u5fa1\u4e0d\u80fd\u306a\u518d\u5e30\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u3046\u8106\u5f31\u6027\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u8a2d\u5b9a\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u4ee5\u5916\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u542b\u3080\u30d1\u30bf\u30fc\u30f3\u30ec\u30a4\u30a2\u30a6\u30c8(\u4f8b: $${ctx:loginId})\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b9\u30ec\u30c3\u30c9\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30de\u30c3\u30d7(MDC)\u306e\u5165\u529b\u30c7\u30fc\u30bf\u3092\u5236\u5fa1\u3067\u304d\u308b\u653b\u6483\u8005\u306f\u3001\u518d\u5e30\u7684\u306a\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u542b\u3080\u4e0d\u6b63\u306a\u5165\u529b\u30c7\u30fc\u30bf\u3092\u4f5c\u6210\u3057\u3001StackOverflowError\u3092\u767a\u751f\u3055\u305b\u3066\u30d7\u30ed\u30bb\u30b9\u3092\u7d42\u4e86\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u306e\u3053\u3068\u3002\u3053\u306e\u3088\u3046\u306a\u624b\u6cd5\u306fDoS(Denial of Service))\u653b\u6483\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u306fLog4j 1.x\u306b\u306f\u5f71\u97ff\u305b\u305a\u3001Log4j 2.x\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001Java 8\u4ee5\u964d\u306e\u30e6\u30fc\u30b6\u30fc\u306f2.17.0\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u3067\u554f\u984c\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u306f\u8a2d\u5b9a\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u554f\u984c\u3092\u7de9\u548c\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30ed\u30ae\u30f3\u30b0\u8a2d\u5b9a\u306e\u30d1\u30bf\u30fc\u30f3\u30ec\u30a4\u30a2\u30a6\u30c8\u3067\u3001${ctx:loginId} \u3084 $${ctx:loginId} \u306a\u3069\u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092Thread Context Map\u30d1\u30bf\u30fc\u30f3 (%X, %mdc, %MDC)\u3067\u7f6e\u304d\u63db\u3048\u308b\u3002<\/li>\n<li>\u305d\u308c\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u3001HTTP\u30d8\u30c3\u30c0\u3084\u30e6\u30fc\u30b6\u5165\u529b\u306a\u3069\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5916\u90e8\u30bd\u30fc\u30b9\u306b\u7531\u6765\u3059\u308b${ctx:loginId}\u3084$${ctx:loginId}\u306a\u3069\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3078\u306e\u53c2\u7167\u3092\u8a2d\u5b9a\u304b\u3089\u524a\u9664\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u8106\u5f31\u6027\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u306e\u306f\u3001log4j-core JAR\u30d5\u30a1\u30a4\u30eb\u306e\u307f\u3067\u3001log4j-core JAR\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u305b\u305a\u3001log4j-api JAR\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u5f71\u97ff\u304c\u306a\u3044\u3068\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u8a73\u7d30\u306f<a href=\"https:\/\/logging.apache.org\/log4j\/2.x\/security.html#CVE-2021-45105\">\u3053\u3061\u3089<\/a>\u3067\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>[via <a href=\"https:\/\/www.cyberkendra.com\/2021\/12\/3rd-vulnerability-on-apache-log4j.html\">[Log4Shell] 3rd Vulnerability on Apache Log4j Utility Found - Cyber Kendra<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Apple\u958b\u767a\u30c1\u30fc\u30e0\u304c\u3001\u300cApache Log4j\u300d\u306e\u6700\u65b0\u7248v2.17.0\u3092\u516c\u958b\u3057\u307e\u3057\u305f\u3002 \u5148\u65e5\u3088\u308a\u8a71\u984c\u3068\u306a\u3063\u3066\u3044\u308bLog4j\u306e\u8106\u5f31\u6027\u306fv2.16.0\u3067\u4fee\u6b63\u3055\u308c\u3066\u3044\u308b\u306f\u305a\u3067\u3057\u305f\u304c\u30012.16.0\u306b\u3082DoS\u8106\u5f31\u6027(CVE-2 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":93445,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[75],"tags":[4443],"class_list":["post-93444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","tag-log4j"],"_links":{"self":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/93444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/comments?post=93444"}],"version-history":[{"count":0,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/93444\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media\/93445"}],"wp:attachment":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media?parent=93444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/categories?post=93444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/tags?post=93444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}