{"id":2102,"date":"2017-09-01T14:10:59","date_gmt":"2017-09-01T12:10:59","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=2102"},"modified":"2017-09-01T15:23:49","modified_gmt":"2017-09-01T13:23:49","slug":"graphicsmagick-use-after-free-in-closeblob-blob-c-incomplete-fix-for-cve-2017-11403","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/09\/01\/graphicsmagick-use-after-free-in-closeblob-blob-c-incomplete-fix-for-cve-2017-11403\/","title":{"rendered":"graphicsmagick: use-after-free in CloseBlob (blob.c) (INCOMPLETE FIX FOR CVE-2017-11403)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/www.graphicsmagick.org\/\">graphicsmagick<\/a> is a collection of tools and libraries for many image formats.<\/p>\n<p>After some test I realized that the fix for CVE-2017-11403 was not enough, see also:<\/p>\n<blockquote data-secret=\"Ufh9MpiM6f\" class=\"wp-embedded-content\"><p><a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/07\/12\/graphicsmagick-use-after-free-in-closeblob-blob-c\/\">graphicsmagick: use-after-free in CloseBlob (blob.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=\"https:\/\/blogs.gentoo.org\/ago\/2017\/07\/12\/graphicsmagick-use-after-free-in-closeblob-blob-c\/embed\/#?secret=Ufh9MpiM6f\" data-secret=\"Ufh9MpiM6f\" width=\"600\" height=\"338\" title=\"&#8220;graphicsmagick: use-after-free in CloseBlob (blob.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>The complete ASan output of the issue:<\/p>\n<pre><font size=\"2\"># gm identify $FILE\r\n==20404==ERROR: AddressSanitizer: heap-use-after-free on address 0x6230000053c0 at pc 0x7fc01a253357 bp 0x7fffcd2d2630 sp 0x7fffcd2d2628\r\nREAD of size 8 at 0x6230000053c0 thread T0\r\n    #0 0x7fc01a253356 in CloseBlob \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/blob.c:859:3\r\n    #1 0x7fc013fbed77 in ReadMNGImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/png.c:5144:11\r\n    #2 0x7fc01a50ee88 in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/constitute.c:1607:13\r\n    #3 0x7fc01a3a1f18 in ConvertImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:4348:22\r\n    #4 0x7fc01a3de0c5 in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:8869:17\r\n    #5 0x7fc01a48985b in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17396:10\r\n    #6 0x7fc01a486991 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17449:16\r\n    #7 0x7fc018cf1680 in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.23-r4\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n    #8 0x419cd8 in _init (\/usr\/bin\/gm+0x419cd8)\r\n\r\n0x6230000053c0 is located 6848 bytes inside of 6856-byte region [0x623000003900,0x6230000053c8)\r\nfreed by thread T0 here:\r\n    #0 0x4cf4d0 in __interceptor_cfree \/var\/tmp\/portage\/sys-libs\/compiler-rt-sanitizers-4.0.1\/work\/compiler-rt-4.0.1.src\/lib\/asan\/asan_malloc_linux.cc:55\r\n    #1 0x7fc01a8f13d2 in MagickFree \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/memory.c:509:5\r\n    #2 0x7fc01a7dc750 in DestroyImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/image.c:1277:3\r\n    #3 0x7fc01a8a7cda in DestroyImageList \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/list.c:239:5\r\n    #4 0x7fc013fbed6f in ReadMNGImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/png.c:5143:11\r\n    #5 0x7fc01a50ee88 in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/constitute.c:1607:13\r\n    #6 0x7fc01a3a1f18 in ConvertImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:4348:22\r\n    #7 0x7fc01a3de0c5 in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:8869:17\r\n    #8 0x7fc01a48985b in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17396:10\r\n    #9 0x7fc01a486991 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17449:16\r\n    #10 0x7fc018cf1680 in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.23-r4\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n\r\npreviously allocated by thread T0 here:\r\n    #0 0x4cf688 in malloc \/var\/tmp\/portage\/sys-libs\/compiler-rt-sanitizers-4.0.1\/work\/compiler-rt-4.0.1.src\/lib\/asan\/asan_malloc_linux.cc:66\r\n    #1 0x7fc01a8f04d6 in MagickMalloc \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/memory.c:156:10\r\n    #2 0x7fc01a7a6fa3 in AllocateImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/image.c:336:18\r\n    #3 0x7fc013f7819a in ReadMNGImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/png.c:3872:9\r\n    #4 0x7fc01a50ee88 in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/constitute.c:1607:13\r\n    #5 0x7fc01a3a1f18 in ConvertImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:4348:22\r\n    #6 0x7fc01a3de0c5 in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:8869:17\r\n    #7 0x7fc01a48985b in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17396:10\r\n    #8 0x7fc01a486991 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17449:16\r\n    #9 0x7fc018cf1680 in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.23-r4\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n\r\nSUMMARY: AddressSanitizer: heap-use-after-free \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/blob.c:859:3 in CloseBlob\r\nShadow bytes around the buggy address:\r\n  0x0c467fff8a20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c467fff8a30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c467fff8a40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c467fff8a50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c467fff8a60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n=&gt;0x0c467fff8a70: fd fd fd fd fd fd fd fd[fd]fa fa fa fa fa fa fa\r\n  0x0c467fff8a80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c467fff8a90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c467fff8aa0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c467fff8ab0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c467fff8ac0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\nShadow byte legend (one shadow byte represents 8 application bytes):\r\n  Addressable:           00\r\n  Partially addressable: 01 02 03 04 05 06 07 \r\n  Heap left redzone:       fa\r\n  Freed heap region:       fd\r\n  Stack left redzone:      f1\r\n  Stack mid redzone:       f2\r\n  Stack right redzone:     f3\r\n  Stack after return:      f5\r\n  Stack use after scope:   f8\r\n  Global redzone:          f9\r\n  Global init order:       f6\r\n  Poisoned by user:        f7\r\n  Container overflow:      fc\r\n  Array cookie:            ac\r\n  Intra object redzone:    bb\r\n  ASan internal:           fe\r\n  Left alloca redzone:     ca\r\n  Right alloca redzone:    cb\r\n==20404==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n1.3.26<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/98721124e51f\">http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/98721124e51f<\/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-2017-14103<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00333-graphicsmagick-UAF-CloseBlob\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00333-graphicsmagick-UAF-CloseBlob<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-08-02: bug discovered and reported to upstream<br \/>\n2017-08-27: upstream released a fix<br \/>\n2017-09-01: blog post about the issue<br \/>\n2017-09-01: 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>.<br \/>\nThis bug was identified with bare metal servers donated by <a href=\"https:\/\/www.packet.net\/\">Packet<\/a>. This work is also supported by the <a href=\"https:\/\/www.coreinfrastructure.org\">Core Infrastructure Initiative<\/a>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"EZlHuVrRRI\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/09\/01\/graphicsmagick-use-after-free-in-closeblob-blob-c-incomplete-fix-for-cve-2017-11403\/\">graphicsmagick: use-after-free in CloseBlob (blob.c) (INCOMPLETE FIX FOR CVE-2017-11403)<\/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\/2017\/09\/01\/graphicsmagick-use-after-free-in-closeblob-blob-c-incomplete-fix-for-cve-2017-11403\/embed\/#?secret=EZlHuVrRRI\" data-secret=\"EZlHuVrRRI\" width=\"600\" height=\"338\" title=\"&#8220;graphicsmagick: use-after-free in CloseBlob (blob.c) (INCOMPLETE FIX FOR CVE-2017-11403)&#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 a collection of tools and libraries for many image formats. After some test I realized that the fix for CVE-2017-11403 was not enough, see also: graphicsmagick: use-after-free in CloseBlob (blob.c) The complete ASan output of the issue: &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/09\/01\/graphicsmagick-use-after-free-in-closeblob-blob-c-incomplete-fix-for-cve-2017-11403\/\">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-xU","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/2102"}],"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=2102"}],"version-history":[{"count":4,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/2102\/revisions"}],"predecessor-version":[{"id":2106,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/2102\/revisions\/2106"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=2102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=2102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=2102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}