{"id":1182,"date":"2017-02-01T17:03:22","date_gmt":"2017-02-01T15:03:22","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1182"},"modified":"2017-02-01T17:10:59","modified_gmt":"2017-02-01T15:10:59","slug":"podofo-null-pointer-dereference-in-pdfinfoguessformat-pdfinfo-cpp","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/podofo-null-pointer-dereference-in-pdfinfoguessformat-pdfinfo-cpp\/","title":{"rendered":"podofo: NULL pointer dereference in PdfInfo::GuessFormat (pdfinfo.cpp)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"https:\/\/sourceforge.net\/projects\/podofo\/\">podofo<\/a> is a C++ library to work with the PDF file format.<\/p>\n<p>A fuzz on it discovered a NULL pointer access. The upstream project denies me to open a new ticket. So, I&#8217;m unable to communicate with them.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># podofopdfinfo $FILE\r\n==24654==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000005149a7 bp 0x7ffe59e91e70 sp 0x7ffe59e91d80 T0)\r\n==24654==The signal is caused by a READ memory access.\r\n==24654==Hint: address points to the zero page.\r\n    #0 0x5149a6 in PdfInfo::GuessFormat() \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofopdfinfo\/pdfinfo.cpp:210:19\r\n    #1 0x512351 in PdfInfo::OutputDocumentInfo(std::ostream&amp;) \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofopdfinfo\/pdfinfo.cpp:40:35\r\n    #2 0x522132 in main \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofopdfinfo\/podofopdfinfo.cpp:117:18\r\n    #3 0x7fcaaf4b861f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289\r\n    #4 0x41e8f8 in _start (\/usr\/bin\/podofopdfinfo+0x41e8f8)\r\n\r\nAddressSanitizer can not provide additional info.\r\nSUMMARY: AddressSanitizer: SEGV \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofopdfinfo\/pdfinfo.cpp:210:19 in PdfInfo::GuessFormat()\r\n==24654==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n0.9.4<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Credit:<\/strong><br \/>\nThis bug was discovered by Agostino Sarubbo of Gentoo.<\/p>\n<p><strong>CVE:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00133-podofo-nullptr-pdfinfo-cpp\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00133-podofo-nullptr-pdfinfo-cpp<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-01-05: bug discovered<br \/>\n2017-02-01: blog post about the issue<\/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><br \/>\nhttps:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/podofo-null-pointer-dereference-in-pdfinfoguessformat-pdfinfo-cpp<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: podofo is a C++ library to work with the PDF file format. A fuzz on it discovered a NULL pointer access. The upstream project denies me to open a new ticket. So, I&#8217;m unable to communicate with them. The &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/podofo-null-pointer-dereference-in-pdfinfoguessformat-pdfinfo-cpp\/\">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-j4","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1182"}],"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=1182"}],"version-history":[{"count":6,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1182\/revisions"}],"predecessor-version":[{"id":1263,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1182\/revisions\/1263"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}