{"id":1079,"date":"2017-01-01T17:36:36","date_gmt":"2017-01-01T15:36:36","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1079"},"modified":"2017-01-01T17:36:36","modified_gmt":"2017-01-01T15:36:36","slug":"libtiff-assertion-failure-in-readseparatetilesintobuffer-tiffcp-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/01\/01\/libtiff-assertion-failure-in-readseparatetilesintobuffer-tiffcp-c\/","title":{"rendered":"libtiff: assertion failure in readSeparateTilesIntoBuffer (tiffcp.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/libtiff.maptools.org\">Libtiff<\/a> is a software that provides support for the Tag Image File Format (TIFF), a widely used format for storing image data.<\/p>\n<p>A crafted tiff file revealed an assertion failure.<\/p>\n<p>The complete output:<\/p>\n<pre><font size=\"2\"># tiffcp -i $FILE \/tmp\/foo\r\ntiffcp: \/tmp\/portage\/media-libs\/tiff-4.0.7\/work\/tiff-4.0.7\/tools\/tiffcp.c:1390:\r\nint readSeparateTilesIntoBuffer(TIFF *, uint8 *, uint32, uint32, tsample_t):\r\nAssertion `bps % 8 == 0' failed.\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n4.0.7<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/vadz\/libtiff\/commit\/7ff9652da2eec4c65279dcbc7e55c0418e87bbc8\">https:\/\/github.com\/vadz\/libtiff\/commit\/7ff9652da2eec4c65279dcbc7e55c0418e87bbc8<\/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\/00072-libtiff-assert-readSeparateTilesIntoBuffer\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00072-libtiff-assert-readSeparateTilesIntoBuffer<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2016-11-23: bug discovered and reported to upstream<br \/>\n2016-12-03: upstream released a patch<br \/>\n2017-01-01: 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><\/p>\n<blockquote data-secret=\"aR9arV94uP\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/01\/01\/libtiff-assertion-failure-in-readseparatetilesintobuffer-tiffcp-c\/\">libtiff: assertion failure in readSeparateTilesIntoBuffer (tiffcp.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\/2017\/01\/01\/libtiff-assertion-failure-in-readseparatetilesintobuffer-tiffcp-c\/embed\/#?secret=aR9arV94uP\" data-secret=\"aR9arV94uP\" width=\"600\" height=\"338\" title=\"&#8220;libtiff: assertion failure in readSeparateTilesIntoBuffer (tiffcp.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: Libtiff is a software that provides support for the Tag Image File Format (TIFF), a widely used format for storing image data. A crafted tiff file revealed an assertion failure. The complete output: # tiffcp -i $FILE \/tmp\/foo tiffcp: &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/01\/01\/libtiff-assertion-failure-in-readseparatetilesintobuffer-tiffcp-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-hp","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1079"}],"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=1079"}],"version-history":[{"count":3,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1079\/revisions"}],"predecessor-version":[{"id":1083,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1079\/revisions\/1083"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1079"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1079"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1079"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}