Date: Tue, 8 Feb 2011 11:54:16 +0100 From: Thomas Biege <thomas@...e.de> To: oss-security@...ts.openwall.com Subject: Re: CVE request: xpdf Should CVE-IDs be assigned to this issues? Am Freitag 21 Januar 2011 00:15:49 schrieb Dan Rosenberg: > I identified two issues in xpdf. I don't think the first requires a > CVE, since it's incredibly unlikely to be exploitable, but I include > it here in case someone disagrees. > > 1. Due to an integer overflow when parsing CharCodes for fonts and a > failure to check the return value of a memory allocation, it is > possible to trigger writes to a narrow range of offsets from a NULL > pointer. The chance of being able to exploit this for anything other > than a crash is very remote: on x86 32-bit, there's no chance (since > the write occurs between 0xffffffc4 and 0xfffffffc). At least the > write lands in valid userspace on x86-64, but in my testing this > memory is never mapped. Fixed in poppler commit at , hopefully > fixed soon at xpdf upstream. > > 2. Malformed commands may cause corruption of the internal stack used > to maintain graphics contexts, leading to potentially exploitable > memory corruption. Fixed in poppler commit at , hopefully fixed > soon at xpdf upstream. > > -Dan > >  http://cgit.freedesktop.org/poppler/poppler/commit/?id=cad66a7d25abdb6aa15f3aa94a35737b119b2659 >  http://cgit.freedesktop.org/poppler/poppler/commit/?id=8284008aa8230a92ba08d547864353d3290e9bf9 > -- Thomas Biege <thomas@...e.de>, SUSE LINUX, Security Support & Auditing SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg) -- Wer aufhoert besser werden zu wollen, hoert auf gut zu sein. -- Marie von Ebner-Eschenbach
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