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Date: Sat, 19 Nov 2016 17:18:26 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: imagemagick: null pointer must never be null (tiff.c)
If suitable for a CVE please assign one. Thanks.
Description:
imagemagick is a software suite to create, edit, compose, or convert bitmap
images.
A fuzz on an updated version with the undefined behavior sanitizer enabled,
revealed a null pointer which is declared to never be null.
The complete UBSan output:
# identify $FILE
coders/tiff.c:655:39: runtime error: null pointer passed as argument 2, which
is declared to never be null
MagickCore/string_.h:76:23: note: nonnull attribute specified here
Affected version:
7.0.3.6
Fixed version:
7.0.3.7
Commit fix:
https://github.com/ImageMagick/ImageMagick/commit/b61d35eaccc0a7ddeff8a1c3abfcd0a43ccf210b
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00049-imagemagick-pointernerverbenull
Timeline:
2016-11-09: bug discovered and reported to upstream
2016-11-09: upstream released a patch
2016-11-15: upstream released 7.0.3.7
2016-11-19: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2016/11/19/imagemagick-null-pointer-must-never-be-null-tiff-c
--
Agostino Sarubbo
Gentoo Linux Developer
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