{"id":1720,"date":"2017-04-30T12:48:59","date_gmt":"2017-04-30T10:48:59","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1720"},"modified":"2017-05-01T13:33:30","modified_gmt":"2017-05-01T11:33:30","slug":"libmad-assertion-failure-in-layer3-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/04\/30\/libmad-assertion-failure-in-layer3-c\/","title":{"rendered":"libmad: assertion failure in layer3.c"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/mad.sourceforge.net\">libmad<\/a> stays for &#8220;M&#8221;peg &#8220;A&#8221;udio &#8220;D&#8221;ecoder library.<\/p>\n<p>The same testcase provided in the article: <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/04\/30\/libmad-heap-based-buffer-overflow-in-mad_layer_iii-layer3-c\/\">libmad: heap-based buffer overflow in mad_layer_III (layer3.c)<\/a> is able to show an assertion failure if libmad was compiled with debug (&#8211;enable-debugging).<\/p>\n<p>The complete output of the failure:<\/p>\n<pre><font size=\"2\"># madplay -v -i -o raw:out $FILE\r\nmadplay: \/tmp\/portage\/media-libs\/libmad-0.15.1b-r8\/work\/libmad-0.15.1b\/layer3.c:2633: mad_layer_III: Assertion `stream-&gt;md_len + md_len - si.main_data_begin &lt;= MAD_BUFFER_MDLEN&#039; failed.\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n0.15.1b<\/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-2017-8372<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00213-libmad-heapoverflow-mad_layer_III\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00213-libmad-heapoverflow-mad_layer_III<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-01-01: bug discovered and reported to upstream<br \/>\n2017-04-30: blog post about the issue<br \/>\n2017-05-01: 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>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"0GIM9riNfQ\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/04\/30\/libmad-assertion-failure-in-layer3-c\/\">libmad: assertion failure in layer3.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\/04\/30\/libmad-assertion-failure-in-layer3-c\/embed\/#?secret=0GIM9riNfQ\" data-secret=\"0GIM9riNfQ\" width=\"600\" height=\"338\" title=\"&#8220;libmad: assertion failure in layer3.c&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: libmad stays for &#8220;M&#8221;peg &#8220;A&#8221;udio &#8220;D&#8221;ecoder library. The same testcase provided in the article: libmad: heap-based buffer overflow in mad_layer_III (layer3.c) is able to show an assertion failure if libmad was compiled with debug (&#8211;enable-debugging). The complete output of &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/04\/30\/libmad-assertion-failure-in-layer3-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-rK","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1720"}],"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=1720"}],"version-history":[{"count":3,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1720\/revisions"}],"predecessor-version":[{"id":1739,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1720\/revisions\/1739"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}