{"id":1332,"date":"2017-03-02T18:24:48","date_gmt":"2017-03-02T16:24:48","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1332"},"modified":"2017-03-13T12:02:20","modified_gmt":"2017-03-13T10:02:20","slug":"podofo-null-pointer-dereference-in-podofopdfcolorgraypdfcolorgray-pdfcolor-cpp","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/03\/02\/podofo-null-pointer-dereference-in-podofopdfcolorgraypdfcolorgray-pdfcolor-cpp\/","title":{"rendered":"podofo: NULL pointer dereference in PoDoFo::PdfColorGray::~PdfColorGray (PdfColor.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 dereference. The upstream project denies me to open a new ticket. So, I just will forward this on the -users mailing list.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># podofocolor dummy $FILE foo\r\n==5815==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f025d243787 bp 0x7ffe33517c50 sp 0x7ffe33517be0 T0)\r\n==5815==The signal is caused by a READ memory access.\r\n==5815==Hint: address points to the zero page.\r\n    #0 0x7f025d243786 in PoDoFo::PdfColorGray::~PdfColorGray() \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/src\/base\/PdfColor.cpp:435:1\r\n    #1 0x52c9b2 in GraphicsStack::TGraphicsStackElement::~TGraphicsStackElement() \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofocolor\/graphicsstack.h:29:11\r\n    #2 0x52c9b2 in __gnu_cxx::new_allocator::destroy(GraphicsStack::TGraphicsStackElement*) \/usr\/lib\/gcc\/x86_64-pc-linux-gnu\/4.9.3\/include\/g++-v4\/ext\/new_allocator.h:133\r\n    #3 0x52c9b2 in std::deque&lt;GraphicsStack::TGraphicsStackElement, std::allocator &gt;::_M_pop_back_aux() \/usr\/lib\/gcc\/x86_64-pc-linux-gnu\/4.9.3\/include\/g++-v4\/bits\/deque.tcc:515\r\n    #4 0x52c9b2 in std::deque&lt;GraphicsStack::TGraphicsStackElement, std::allocator &gt;::pop_back() \/usr\/lib\/gcc\/x86_64-pc-linux-gnu\/4.9.3\/include\/g++-v4\/bits\/stl_deque.h:1459\r\n    #5 0x52c9b2 in std::stack&lt;GraphicsStack::TGraphicsStackElement, std::deque&lt;GraphicsStack::TGraphicsStackElement, std::allocator &gt; &gt;::pop() \/usr\/lib\/gcc\/x86_64-pc-linux-gnu\/4.9.3\/include\/g++-v4\/bits\/stl_stack.h:218\r\n    #6 0x52c9b2 in GraphicsStack::Pop() \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofocolor\/graphicsstack.cpp:48\r\n    #7 0x522031 in ColorChanger::ReplaceColorsInPage(PoDoFo::PdfCanvas*) \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofocolor\/colorchanger.cpp:190:35\r\n    #8 0x51ed8e in ColorChanger::start() \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofocolor\/colorchanger.cpp:120:15\r\n    #9 0x51c06d in main \/tmp\/portage\/app-text\/podofo-0.9.4\/work\/podofo-0.9.4\/tools\/podofocolor\/podofocolor.cpp:116:12\r\n    #10 0x7f025bd2e61f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289\r\n    #11 0x428718 in _start (\/usr\/bin\/podofocolor+0x428718)\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\/src\/base\/PdfColor.cpp:435:1 in PoDoFo::PdfColorGray::~PdfColorGray()\r\n==5815==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 \/>\nCVE-2017-6849<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00175-podofo-nullptr-PoDoFo-PdfColorGray-PdfColorGray\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00175-podofo-nullptr-PoDoFo-PdfColorGray-PdfColorGray<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-02-13: bug discovered<br \/>\n2017-03-02: bug reported to upstream<br \/>\n2017-03-02: blog post about the issue<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=\"7HuOsJHTip\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/03\/02\/podofo-null-pointer-dereference-in-podofopdfcolorgraypdfcolorgray-pdfcolor-cpp\/\">podofo: NULL pointer dereference in PoDoFo::PdfColorGray::~PdfColorGray (PdfColor.cpp)<\/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\/03\/02\/podofo-null-pointer-dereference-in-podofopdfcolorgraypdfcolorgray-pdfcolor-cpp\/embed\/#?secret=7HuOsJHTip\" data-secret=\"7HuOsJHTip\" width=\"600\" height=\"338\" title=\"&#8220;podofo: NULL pointer dereference in PoDoFo::PdfColorGray::~PdfColorGray (PdfColor.cpp)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/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 dereference. The upstream project denies me to open a new ticket. So, I just will forward this on the &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/03\/02\/podofo-null-pointer-dereference-in-podofopdfcolorgraypdfcolorgray-pdfcolor-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-lu","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1332"}],"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=1332"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1332\/revisions"}],"predecessor-version":[{"id":1459,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1332\/revisions\/1459"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}