{"id":20606,"date":"2021-12-15T10:38:55","date_gmt":"2021-12-15T01:38:55","guid":{"rendered":"http:\/\/nori.company\/?p=20606"},"modified":"2021-12-15T10:39:06","modified_gmt":"2021-12-15T01:39:06","slug":"apache-log4j-2-%eb%b3%b4%ec%95%88-%ec%97%85%eb%8d%b0%ec%9d%b4%ed%8a%b8-%ea%b6%8c%ea%b3%a0","status":"publish","type":"post","link":"https:\/\/nori.company\/?p=20606","title":{"rendered":"Apache Log4j 2 \ubcf4\uc548 \uc5c5\ub370\uc774\ud2b8 \uad8c\uace0"},"content":{"rendered":"\n<p>\u25a1 \uac1c\uc694<br \/>&nbsp;o Apache \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc7ac\ub2e8\uc740 \uc790\uc0ac\uc758 Log4j 2\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ucde8\uc57d\uc810\uc744 \ud574\uacb0\ud55c \ubcf4\uc548 \uc5c5\ub370\uc774\ud2b8 \uad8c\uace0[1]&nbsp;o \uacf5\uaca9\uc790\ub294 \ud574\ub2f9 \ucde8\uc57d\uc810\uc744 \uc774\uc6a9\ud558\uc5ec \uc545\uc131\ucf54\ub4dc \uac10\uc5fc \ub4f1\uc758 \ud53c\ud574\ub97c \ubc1c\uc0dd\uc2dc\ud0ac\uc218 \uc788\uc73c\ubbc0\ub85c, \ucd5c\uc2e0 \ubc84\uc804\uc73c\ub85c \uc5c5\ub370\uc774\ud2b8 \uad8c\uace0<br \/>&nbsp; &nbsp;\u203b \uad00\ub828 \uc0ac\ud56d\uc740 \ucc38\uace0\uc0ac\uc774\ud2b8 [6] &#8220;QnA \ud615\uc2dd\uc73c\ub85c \uc54c\uc544\ubcf4\ub294 Apache log4j \ucde8\uc57d\uc810 \ub300\uc751 \uac00\uc774\ub4dc&#8221;\ub97c \ucc38\uace0 \ubc14\ub78d\ub2c8\ub2e4.<br \/>&nbsp;<br \/>\u25a1 \uc8fc\uc694 \ub0b4\uc6a9<br \/>&nbsp;o Apache Log4j 2*\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \uc6d0\uaca9\ucf54\ub4dc \uc2e4\ud589 \ucde8\uc57d\uc810(CVE-2021-44228)[2]&nbsp; &nbsp;* \ud504\ub85c\uadf8\ub7a8 \uc791\uc131 \uc911 \ub85c\uadf8\ub97c \ub0a8\uae30\uae30 \uc704\ud574 \uc0ac\uc6a9\ub418\ub294 \uc790\ubc14 \uae30\ubc18\uc758 \uc624\ud508\uc18c\uc2a4 \uc720\ud2f8\ub9ac\ud2f0<br \/><br \/>\u25a1 \uc601\ud5a5\uc744 \ubc1b\ub294 \ubc84\uc804<br \/>&nbsp;o Apache Log4j 2<br \/>&nbsp; &nbsp;&#8211;&nbsp;2.0-beta9 ~ 2.14.1 \ubaa8\ub4e0\ubc84\uc804<br \/>&nbsp;o Apache Log4j 2\ub97c \uc0ac\uc6a9\ud558\ub294 \uc81c\ud488<br \/>&nbsp; &nbsp; \u203b \ucc38\uace0 \uc0ac\uc774\ud2b8 [4]\ub97c \ud655\uc778\ud558\uc5ec \ud574\ub2f9 \uc81c\ud488\uc744 \uc774\uc6a9 \uc911\uc77c \uacbd\uc6b0, \ud574\ub2f9 \uc81c\uc870\uc0ac\uc758 \uad8c\uace0\uc5d0 \ub530\ub77c \ud328\uce58 \ub610\ub294 \ub300\uc751 \ubc29\uc548 \uc801\uc6a9<br \/>&nbsp;<br \/>\u25a1 \ud574\uacb0\ubc29\uc548[1]&nbsp;o \uc81c\uc870\uc0ac \ud648\ud398\uc774\uc9c0\ub97c \ud1b5\ud574 \ucd5c\uc2e0\ubc84\uc804\uc73c\ub85c \uc5c5\ub370\uc774\ud2b8 \uc801\uc6a9[3]&nbsp; &nbsp;\u203b log4j 1.x\ubc84\uc804 \uc0ac\uc6a9\uc790\uc758 \uacbd\uc6b0 \ucd94\uac00\uc801\uc778 \uc5c5\uadf8\ub808\uc774\ub4dc \uc9c0\uc6d0 \uc911\uc9c0\ub85c \uc778\ud574 \ub2e4\ub978 \ubcf4\uc548\uc704\ud611\uc5d0 \ub178\ucd9c\ub420 \uac00\ub2a5\uc131\uc774 \ub192\uc544 \ucd5c\uc2e0\ubc84\uc804 \uc5c5\ub370\uc774\ud2b8 \uc801\uc6a9 \uad8c\uace0<br \/>&nbsp; &nbsp;\u203b \uc81c\uc870\uc0ac \ud648\ud398\uc774\uc9c0(\ucc38\uace0\uc0ac\uc774\ud2b8 [3])\uc5d0 \uc2e0\uaddc\ubc84\uc804\uc774 \uacc4\uc18d \uc5c5\ub370\uc774\ud2b8\ub418\uace0 \uc788\uc5b4 \ud655\uc778 \ud6c4 \uc5c5\ub370\uc774\ud2b8 \uc801\uc6a9 \ud544\uc694<br \/><br \/>&nbsp;o \ucd5c\uc2e0\ubc84\uc804\uc73c\ub85c \uc5c5\ub370\uc774\ud2b8\uac00 \uc5b4\ub824\uc6b4 \uacbd\uc6b0 \uc0ac\uc6a9\uc911\uc778 \ubc84\uc804\ud655\uc778 \ud6c4 \ubc84\uc804\ubcc4 \uc870\uce58 \uc801\uc6a9<br \/>&nbsp; &#8211; \ubc84\uc804\ud655\uc778\ubc29\ubc95<br \/>&nbsp; &nbsp; &nbsp; &nbsp;1. log4j\uac00 \uc124\uce58\ub41c \uacbd\ub85c\uc758 &#8220;\uff50\uff4f\uff4d.\uff58\uff4d\uff4c&#8221;\ud30c\uc77c\uc744 \uc5f4\uc5b4 &#8220;log4j-core&#8221;\ub85c \uac80\uc0c9<\/p>\n\n\n\n<p>&nbsp; &nbsp; &nbsp; &nbsp;2. \uac80\uc0c9\uacb0\uacfc &#8220;\uc0ac\uc6a9\ubc84\uc804(version)&#8221; \ud655\uc778\uac00\ub2a5<br \/>&nbsp; &#8211; \uc870\uce58\ubc29\ubc95<br \/>&nbsp; &nbsp; &nbsp; \u203b (2.0-beta9 ~ 2.10.0) JndiLookup \ud074\ub798\uc2a4\ub97c \uacbd\ub85c\uc5d0\uc11c \uc81c\uac70 : zip -q -d log4j-core-*.jar org\/apache\/logging\/log4j\/core\/lookup\/JndiLookup.class<br \/>&nbsp; &nbsp; &nbsp; \u203b (2.10 ~ 2.14.1) log4j2.formatMsgNoLookups \ub610\ub294 LOG4J_FORMAT_MSG_NO_LOOKUPS \ud658\uacbd\ubcc0\uc218\ub97c true\ub85c \uc124\uc815<br \/>&nbsp; &nbsp; &nbsp; \u203b (2.7 ~ 2.14.1)&nbsp;\ub85c\uadf8 \ucd9c\ub825 \uc2dc %m \ub300\uc2e0 %m{nolookups} \ud3ec\ub9f7\uc73c\ub85c \uc218\uc815 (patternLayout \ud328\ud134 \uc218\uc815)<br \/><br \/>\u25a1 \ud0d0\uc9c0\uc815\ucc45<br \/>o Log4j \ucde8\uc57d\uc810 \uad00\ub828 \ud0d0\uc9c0\uc815\ucc45(\uc2dc\uadf8\ub2c8\ucc98)<br \/>&nbsp; &#8211; \ucc38\uace0\uc0ac\uc774\ud2b8 [5]\ub97c \ucc38\uace0\ud558\uc5ec&nbsp;Log4j\ub85c \uac80\uc0c9\ud558\uc5ec \ud0d0\uc9c0\uc815\ucc45 \ud655\uc778<br \/>&nbsp; &nbsp; &nbsp;\u203b \ubcf8 \ud0d0\uc9c0\uc815\ucc45\uc740 \ub0b4\ubd80 \uc2dc\uc2a4\ud15c \ud658\uacbd\uc5d0 \ub530\ub77c \ub2e4\ub974\uac8c \ub3d9\uc791\ud560 \uc218 \uc788\uc73c\uba70, \uc2dc\uc2a4\ud15c \uc6b4\uc601\uc5d0 \uc601\ud5a5\uc744 \uc904 \uc218 \uc788\uc73c\ubbc0\ub85c \ucda9\ubd84\ud55c \uac80<br \/>\ud1a0 \ud6c4 \uc801\uc6a9 \ubc14\ub78d\ub2c8\ub2e4.<br \/>&nbsp; &nbsp; &nbsp;\u203b \uacf5\uac1c\ub41c \ud0d0\uc9c0\uc815\ucc45\uc740 \uc6b0\ud68c\uac00\ub2a5\uc131\uc774 \uc788\uc73c\ubbc0\ub85c \uc9c0\uc18d\uc801\uc778 \uc5c5\ub370\uc774\ud2b8\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<br \/><br \/><img decoding=\"async\" alt=\"rules\" src=\"https:\/\/www.krcert.or.kr\/contentsImgView.do?fileName=20211213013823.png\"\/><br \/><br \/>\u25a1 \uae30\ud0c0 \ubb38\uc758\uc0ac\ud56d<br \/>&nbsp;o \ud55c\uad6d\uc778\ud130\ub137\uc9c4\ud765\uc6d0 \uc0ac\uc774\ubc84\ubbfc\uc6d0\uc13c\ud130: \uad6d\ubc88\uc5c6\uc774 118<br \/><br \/>[\ucc38\uace0\uc0ac\uc774\ud2b8][1] apache \ubcf4\uc548\uc5c5\ub370\uc774\ud2b8 \ud604\ud669&nbsp;:&nbsp;<a href=\"https:\/\/logging.apache.org\/log4j\/2.x\/security.html\">https:\/\/logging.apache.org\/log4j\/2.x\/security.html<\/a><br \/>[2] \ucde8\uc57d\uc810 \uc815\ubcf4 :&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-44228\">https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-44228<\/a><br \/>[3] \uc2e0\uaddc\ubc84\uc804 \ub2e4\uc6b4\ub85c\ub4dc :&nbsp;<a href=\"https:\/\/logging.apache.org\/log4j\/2.x\/download.html\">https:\/\/logging.apache.org\/log4j\/2.x\/download.html<\/a><br \/>[4] \uc81c\uc870\uc0ac\ubcc4 \ud604\ud669 :&nbsp;<a href=\"https:\/\/gist.github.com\/SwitHak\/b66db3a06c2955a9cb71a8718970c592\">https:\/\/gist.github.com\/SwitHak\/b66db3a06c2955a9cb71a8718970c592<\/a><br \/>[5] \ud0d0\uc9c0\uc815\ucc45 :&nbsp;<a href=\"https:\/\/rules.emergingthreatspro.com\/open\/suricata-5.0\/rules\/emerging-exploit.rules\">https:\/\/rules.emergingthreatspro.com\/open\/suricata-5.0\/rules\/emerging-exploit.rules<\/a><br \/>[6] \ucde8\uc57d\uc810 \ub300\uc751 \uac00\uc774\ub4dc :&nbsp;<a href=\"https:\/\/www.boho.or.kr\/data\/guideView.do?bulletin_writing_sequence=36390\">https:\/\/www.boho.or.kr\/data\/guideView.do?bulletin_writing_sequence=36390<\/a><\/p>\n\n\n\n<p>\u25a1 \uc791\uc131 : \uce68\ud574\uc0ac\uace0\ubd84\uc11d\ub2e8 \ucde8\uc57d\uc810\ubd84\uc11d\ud300<\/p>\n\n\n\n<p>\uc6d0\ubb38 : <a href=\"https:\/\/www.krcert.or.kr\/data\/secNoticeView.do?bulletin_writing_sequence=36389\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.krcert.or.kr\/data\/secNoticeView.do?bulletin_writing_sequence=36389<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u25a1 \uac1c\uc694&nbsp;o Apache \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc7ac\ub2e8\uc740 \uc790\uc0ac\uc758 Log4j 2\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ucde8\uc57d\uc810\uc744 \ud574\uacb0\ud55c \ubcf4\uc548 \uc5c5\ub370\uc774\ud2b8 \uad8c\uace0[1]&nbsp;o \uacf5\uaca9\uc790\ub294 \ud574\ub2f9 \ucde8\uc57d\uc810\uc744 \uc774\uc6a9\ud558\uc5ec \uc545\uc131\ucf54\ub4dc \uac10\uc5fc&hellip;<\/p>\n","protected":false},"author":1,"featured_media":20608,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-20606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/nori.company\/wp\/wp-content\/uploads\/2021\/12\/img-scaled.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pa3PO4-5mm","jetpack-related-posts":[{"id":11255,"url":"https:\/\/nori.company\/?p=11255","url_meta":{"origin":20606,"position":0},"title":"Apache Tomcat AJP \ucde8\uc57d\uc810 \ubcf4\uc548 \uc870\uce58 \uad8c\uace0","author":"\ub178\ub9ac\ucef4\ud37c\ub2c8","date":"2020\ub144 3\uc6d4 13\uc77c","format":false,"excerpt":"\u25a1\u00a0\uac1c\uc694 \u00a0o\u00a0\ucd5c\uadfc\u00a0Apache Tomcat\uc758 \uc6d0\uaca9\ucf54\ub4dc\uc2e4\ud589 \ucde8\uc57d\uc810(CVE-2020-1938)\uc744 \uc545\uc6a9\ud560 \uc218 \uc788\ub294 \uac1c\ub150\uc99d\uba85\ucf54\ub4dc(Proof of concept code, PoC)\uac00 \uc778\ud130\ub137\uc0c1\uc5d0 \uacf5\uac1c\ub418\uc5b4 \uc0ac\uc6a9\uc790\uc758 \ubcf4\uc548 \uac15\ud654 \ud544\uc694\u203b\u00a0\uac1c\ub150\uc99d\uba85\ucf54\ub4dc\u00a0:\u00a0\ucde8\uc57d\uc810\uc744 \uc99d\uba85\/\uac80\uc99d\ud560 \uc218 \uc788\ub294 \ud504\ub85c\uadf8\ub7a8 \ub610\ub294 \uc18c\uc2a4\ucf54\ub4dc \u25a1\u00a0\uc124\uba85 \u00a0o Tomcat\uc774\u00a0AJP request\u00a0\uba54\uc2dc\uc9c0\ub97c \ucc98\ub9ac\ud560 \ub54c,\u00a0\uba54\uc2dc\uc9c0\uc5d0 \ub300\ud55c \ucc98\ub9ac\uac00 \ubbf8\ud761\ud558\uc5ec \ubc1c\uc0dd\ud558\ub294 \uc6d0\uaca9\ucf54\ub4dc\uc2e4\ud589 \ucde8\uc57d\uc810(CVE-2020-1938)\u00a0 \u203b\u00a0AJP(Apache JServ Protocol) :\u00a0\uc6f9\uc11c\ubc84\uc640 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \uc11c\ubc84 \uac04 \uc5f0\uacb0 \uc694\uccad\uc744\u00a08009\ud3ec\ud2b8\ub97c \uc0ac\uc6a9\ud558\uc5ec\u00a0\uc804\ub2ec\ud558\ub294 \ud504\ub85c\ud1a0\ucf5c(\ubaa8\ub2c8\ud130\ub9c1 \uae30\ub2a5 \uc9c0\uc6d0)\u2026","rel":"","context":"&quot;News&quot;\uc5d0\uc11c","block_context":{"text":"News","link":"https:\/\/nori.company\/?cat=1"},"img":{"alt_text":"Apache Software Foundation","src":"https:\/\/i0.wp.com\/nori.company\/wp\/wp-content\/uploads\/2020\/03\/1280px-Apache_Software_Foundation_Logo_2016.svg_.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nori.company\/wp\/wp-content\/uploads\/2020\/03\/1280px-Apache_Software_Foundation_Logo_2016.svg_.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/nori.company\/wp\/wp-content\/uploads\/2020\/03\/1280px-Apache_Software_Foundation_Logo_2016.svg_.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/nori.company\/wp\/wp-content\/uploads\/2020\/03\/1280px-Apache_Software_Foundation_Logo_2016.svg_.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/nori.company\/wp\/wp-content\/uploads\/2020\/03\/1280px-Apache_Software_Foundation_Logo_2016.svg_.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":4796,"url":"https:\/\/nori.company\/?p=4796","url_meta":{"origin":20606,"position":1},"title":"\uc218\uc544\ub7a9, \ub525\ub7ec\ub2dd \uba38\uc2e0\ube44\uc804 \u2018\uc218\uc544\ud0b7 2.3 \ubc84\uc804\u2019 \ucd9c\uc2dc","author":"\ub178\ub9ac\ucef4\ud37c\ub2c8","date":"2019\ub144 9\uc6d4 2\uc77c","format":false,"excerpt":"'Startup's Story Platform\u2019 \ub525\ub7ec\ub2dd \uba38\uc2e0 \ube44\uc804 \uc18c\ud504\ud2b8\uc6e8\uc5b4\u00a0\uc218\uc544\ud0b7(SuaKIT)\uc744 \uac1c\ubc1c\u00b7\ud310\ub9e4\ud558\ub294\u00a0\uc218\uc544\ub7a9(\ub300\ud45c \uc1a1\uae30\uc601)\uc774 \uc9c0\ub09c\u00a02018\ub144\u00a011\uc6d4 \ucd9c\uc2dc\ud55c \u2018\uc218\uc544\ud0b7\u00a02.2\u00a0\ubc84\uc804\u2019\uc758 \uc5c5\uadf8\ub808\uc774\ub4dc \ubc84\uc804\uc778\u00a0\u2018\uc218\uc544\ud0b7\u00a02.3\u2019\uc744 \ucd9c\uc2dc\ud588\ub2e4\uace0\u00a02\uc77c \ubc1d\ud614\ub2e4. \uc218\uc544\ud0b7(SuaKIT)\uc740 \ub525\ub7ec\ub2dd \uae30\ubc18\uc758 \uba38\uc2e0 \ube44\uc804 \ubd88\ub7c9 \uac80\uc0ac \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub85c, \uae30\uc874\uc758 \uba38\uc2e0 \ube44\uc804 \uac80\uc0ac\ub85c\ub294 \uac80\ucd9c\ud558\uc9c0 \ubabb\ud588\ub358 \ube44\uc815\ud615\u00b7\ubd88\uaddc\uce59\uc801\uc778 \ubd88\ub7c9\uc744 \ub525\ub7ec\ub2dd\uc73c\ub85c \uac80\ucd9c\ud560 \uc218 \uc788\ub2e4. \ub514\uc2a4\ud50c\ub808\uc774\u00b7\ubc18\ub3c4\uccb4\u00b7\ud0dc\uc591\uad11 \ub4f1 \uc804\uae30\u00b7\uc804\uc790 \uc0b0\uc5c5\uad70 \ubfd0\ub9cc \uc544\ub2c8\ub77c 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