Date: Fri, 09 Sep 2016 15:59:04 +0200 From: Agostino Sarubbo <ago@...too.org> To: oss-security@...ts.openwall.com Cc: Bob Friesenhahn <bfriesen@...ple.dallas.tx.us> Subject: Re: GraphicsMagick 1.3.25 fixes some security issues On Tuesday 06 September 2016 20:50:23 Bob Friesenhahn wrote: > 4. The TIFF reader had a bug pertaining to use of TIFFGetField() when > a 'count' value is returned. The bug caused a heap read overflow (due > to using strlcpy() to copy a possibly unterminated string) which could > allow an untrusted file to crash the software. For who is interested, the details of the issue N° 4 are documented here: https://blogs.gentoo.org/ago/2016/08/23/graphicsmagick-two-heap-based-buffer-overflow-in-readtiffimage-tiff-c/ The same block of code, which was rewritten because of the overflows, contains also a null pointer access: https://blogs.gentoo.org/ago/2016/09/07/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c/ Unfortunately this problem was not reproducible by Mr Friesenhahn, but seems to be disappeared after the commit which fixed the overflows. -- Agostino --------  https://blogs.gentoo.org/ago/2016/08/23/graphicsmagick-two-heap-based-buffer-overflow-in-readtiffimage-tiff-c/  https://blogs.gentoo.org/ago/2016/09/07/graphicsmagick-null-pointer-dereference-in-magickstrlcpy-utility-c/
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