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Date: Mon, 10 Apr 2017 07:22:46 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: imagemagick: undefined behavior in coders/rle.c
Description:
imagemagick is a software suite to create, edit, compose, or convert bitmap images.
A fuzz with the upstream security policy enabled, a quantum of 32 and the undefined behavior sanitizer discovered this bug.
# identify $FILE
coders/rle.c:274:18: runtime error: value 1.72801e+09 is outside the range of representable values of type 'unsigned char'
Affected version:
7.0.5.4
Fixed version:
7.0.5.5 (not released atm)
Commit fix:
https://github.com/ImageMagick/ImageMagick/commit/b218117cad34d39b9ffb587b45c71c5a49b12bde
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-7606
Reproducer:
https://github.com/asarubbo/poc/blob/master/00253-imagemagick-outside-unsigned-char
Timeline:
2017-03-31: bug discovered and reported to upstream
2017-03-31: upstream released a patch
2017-04-02: blog post about the issue
2017-04-09: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/02/imagemagick-undefined-behavior-in-codersrle-c
--
Agostino Sarubbo
Gentoo Linux Developer
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