{"id":485,"date":"2016-09-07T11:46:24","date_gmt":"2016-09-07T09:46:24","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=485"},"modified":"2016-09-18T18:08:57","modified_gmt":"2016-09-18T16:08:57","slug":"graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2016\/09\/07\/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c\/","title":{"rendered":"graphicsmagick: NULL pointer dereference in MagickStrlCpy (utility.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/www.graphicsmagick.org\/\">Graphicsmagick<\/a> is an Image Processing System.<\/p>\n<p>A fuzzing revealed a NULL pointer access in the TIFF parser.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># gm identify $FILE\r\nASAN:DEADLYSIGNAL\r\n=================================================================\r\n==19028==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fbd36dd6c3c bp 0x7ffe3c007090 sp 0x7ffe3c006d10 T0)\r\n    #0 0x7fbd36dd6c3b in MagickStrlCpy \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/utility.c:4567:3\r\n    #1 0x7fbd2b714c26 in ReadTIFFImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/coders\/tiff.c:2048:13\r\n    #2 0x7fbd36ac506a in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/constitute.c:1607:13\r\n    #3 0x7fbd36ac46ac in PingImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/constitute.c:1370:9\r\n    #4 0x7fbd36a165a0 in IdentifyImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/command.c:8372:17\r\n    #5 0x7fbd36a1affb in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/command.c:8862:17\r\n    #6 0x7fbd36a6fee3 in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/command.c:17370:10\r\n    #7 0x7fbd36a6eb78 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/command.c:17423:16\r\n    #8 0x7fbd3597761f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289\r\n    #9 0x4188d8 in _init (\/usr\/bin\/gm+0x4188d8)\r\n\r\nAddressSanitizer can not provide additional info.\r\nSUMMARY: AddressSanitizer: SEGV \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.24\/work\/GraphicsMagick-1.3.24\/magick\/utility.c:4567:3 in MagickStrlCpy\r\n==19028==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n1.3.24 (and maybe past)<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\n1.3.25<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/eb58028dacf5\">http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/eb58028dacf5<\/a><\/p>\n<p><strong>Credit:<\/strong><br \/>\nThis bug was discovered by Agostino Sarubbo of Gentoo.<\/p>\n<p><strong>CVE:<\/strong><br \/>\nCVE-2016-7449<\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2016-08-17: bug discovered<br \/>\n2016-08-18: bug reported privately to upstream<br \/>\n2016-08-19: upstream released a patch<br \/>\n2016-09-05: upstream released 1.3.25<br \/>\n2016-09-07: blog post about the issue<br \/>\n2016-09-18: CVE assigned<\/p>\n<p><strong>Note:<\/strong><br \/>\nThis bug was found with <a href=\"http:\/\/lcamtuf.coredump.cx\/afl\">American Fuzzy Lop<\/a>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"sTdgR30ugy\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2016\/09\/07\/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c\/\">graphicsmagick: NULL pointer dereference in MagickStrlCpy (utility.c)<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/blogs.gentoo.org\/ago\/2016\/09\/07\/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c\/embed\/#?secret=sTdgR30ugy\" data-secret=\"sTdgR30ugy\" width=\"600\" height=\"338\" title=\"&#8220;graphicsmagick: NULL pointer dereference in MagickStrlCpy (utility.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: Graphicsmagick is an Image Processing System. A fuzzing revealed a NULL pointer access in the TIFF parser. The complete ASan output: # gm identify $FILE ASAN:DEADLYSIGNAL ================================================================= ==19028==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fbd36dd6c3c bp 0x7ffe3c007090 sp &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2016\/09\/07\/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":140,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[12,10],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2EaBc-7P","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/485"}],"collection":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/users\/140"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/comments?post=485"}],"version-history":[{"count":4,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/485\/revisions"}],"predecessor-version":[{"id":566,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/485\/revisions\/566"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}