{"id":619,"date":"2016-09-24T18:31:20","date_gmt":"2016-09-24T16:31:20","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=619"},"modified":"2017-03-13T12:20:57","modified_gmt":"2017-03-13T10:20:57","slug":"mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2016\/09\/24\/mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-c\/","title":{"rendered":"mupdf: mujstest: global-buffer-overflow in main (jstest_main.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\nMujstest, which is part of <a href=\"http:\/\/mupdf.com\/\">mupdf<\/a> is a scriptable tester for mupdf + js.<\/p>\n<p>A fuzzing revealed a global buffer overflow write.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># mujstest $FILE\r\n=================================================================\r\n==2244==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000013c6140 at pc 0x000000473526 bp 0x7fff866f77d0 sp 0x7fff866f6f80\r\nWRITE of size 1181 at 0x0000013c6140 thread T0\r\n    #0 0x473525 in __interceptor_strcpy \/var\/tmp\/portage\/sys-devel\/llvm-3.8.0-r3\/work\/llvm-3.8.0.src\/projects\/compiler-rt\/lib\/asan\/asan_interceptors.cc:547\r\n    #1 0x4f7910 in main \/var\/tmp\/portage\/app-text\/mupdf-1.9a\/work\/mupdf-1.9a\/platform\/x11\/jstest_main.c:353:6\r\n    #2 0x7f3a6c18661f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289\r\n    #3 0x41ade8 in _init (\/usr\/bin\/mujstest+0x41ade8)\r\n\r\n0x0000013c6140 is located 0 bytes to the right of global variable 'filename' defined in 'platform\/x11\/jstest_main.c:15:13' (0x13c5d40) of size 1024\r\nSUMMARY: AddressSanitizer: global-buffer-overflow \/var\/tmp\/portage\/sys-devel\/llvm-3.8.0-r3\/work\/llvm-3.8.0.src\/projects\/compiler-rt\/lib\/asan\/asan_interceptors.cc:547 in __interceptor_strcpy\r\nShadow bytes around the buggy address:\r\n  0x000080270bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n=&gt;0x000080270c20: 00 00 00 00 00 00 00 00[f9]f9 f9 f9 f9 f9 f9 f9\r\n  0x000080270c30: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9\r\n  0x000080270c40: f9 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9\r\n  0x000080270c50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\r\n  0x000080270c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\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  Heap right redzone:      fb\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 partial redzone:   f4\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==2244==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n1.9a<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\n1.10<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"http:\/\/git.ghostscript.com\/?p=mupdf.git;h=cfe8f35bca61056363368c343be36812abde0a06\">http:\/\/git.ghostscript.com\/?p=mupdf.git;h=cfe8f35bca61056363368c343be36812abde0a06<\/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-2016-10246<\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2016-08-04: bug discovered<br \/>\n2016-08-05: bug reported to upstream<br \/>\n2016-09-22: upstream released a patch<br \/>\n2016-09-24: blog post about the issue<br \/>\n2016-10-21: upstream released 1.10<br \/>\n2017-03-12: 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=\"VWvYqi7rZp\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2016\/09\/24\/mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-c\/\">mupdf: mujstest: global-buffer-overflow in main (jstest_main.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\/24\/mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-c\/embed\/#?secret=VWvYqi7rZp\" data-secret=\"VWvYqi7rZp\" width=\"600\" height=\"338\" title=\"&#8220;mupdf: mujstest: global-buffer-overflow in main (jstest_main.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: Mujstest, which is part of mupdf is a scriptable tester for mupdf + js. A fuzzing revealed a global buffer overflow write. The complete ASan output: # mujstest $FILE ================================================================= ==2244==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000013c6140 at pc 0x000000473526 &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2016\/09\/24\/mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-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-9Z","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/619"}],"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=619"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/619\/revisions"}],"predecessor-version":[{"id":1462,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/619\/revisions\/1462"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}