{"id":920,"date":"2016-11-19T16:43:37","date_gmt":"2016-11-19T14:43:37","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=920"},"modified":"2016-11-23T10:47:01","modified_gmt":"2016-11-23T08:47:01","slug":"jasper-signed-integer-overflow-in-jas_image-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2016\/11\/19\/jasper-signed-integer-overflow-in-jas_image-c\/","title":{"rendered":"jasper: signed integer overflow in jas_image.c"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/www.ece.uvic.ca\/~frodo\/jasper\/\">jasper<\/a> is an open-source initiative to provide a free software-based reference implementation of the codec specified in the JPEG-2000 Part-1 standard.<\/p>\n<p>The undefined behavior sanitizer shows a signed integer overflow in jas_image.c<br \/>\nAs you can see, the commit which fixes the issue is not a fix itself for the signed integer overflow, but changed a bit how, in jasper, the things work.<\/p>\n<p>The complete UBSan output:<\/p>\n<pre><font size=\"2\"># imginfo -f $FILE\r\n\/tmp\/portage\/media-libs\/jasper-1.900.17\/work\/jasper-1.900.17\/src\/libjasper\/base\/jas_image.c:162:49: runtime error: signed integer overflow: 8543608947741818625 * 15 cannot be represented in type 'long'\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n1.900.17<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\n1.900.25<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/mdadams\/jasper\/commit\/d42b2388f7f8e0332c846675133acea151fc557a\">https:\/\/github.com\/mdadams\/jasper\/commit\/d42b2388f7f8e0332c846675133acea151fc557a<\/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-2016-9557<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00020-jasper-signedintoverflow-jas_image_c\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00020-jasper-signedintoverflow-jas_image_c<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2016-10-29: bug discovered and reported to upstream<br \/>\n2016-11-12: upstream released a patch and 1.900.25<br \/>\n2016-11-19: blog post about the issue<br \/>\n2016-11-23: 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=\"rRyfvz7gLT\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2016\/11\/19\/jasper-signed-integer-overflow-in-jas_image-c\/\">jasper: signed integer overflow in jas_image.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\/11\/19\/jasper-signed-integer-overflow-in-jas_image-c\/embed\/#?secret=rRyfvz7gLT\" data-secret=\"rRyfvz7gLT\" width=\"600\" height=\"338\" title=\"&#8220;jasper: signed integer overflow in jas_image.c&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: jasper is an open-source initiative to provide a free software-based reference implementation of the codec specified in the JPEG-2000 Part-1 standard. The undefined behavior sanitizer shows a signed integer overflow in jas_image.c As you can see, the commit which &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2016\/11\/19\/jasper-signed-integer-overflow-in-jas_image-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-eQ","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/920"}],"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=920"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/920\/revisions"}],"predecessor-version":[{"id":963,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/920\/revisions\/963"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}