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Date: Sun, 30 Apr 2017 09:11:39 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: imageworsener: two left shift
Description:
imageworsener is a utility for image scaling and processing.
There are two left shift visible with UbSan enabled.
# imagew $FILE /tmp/out -outfmt bmp
src/imagew-util.c:415:68: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
src/imagew-bmp.c:427:10: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
Affected version:
1.3.0
Fixed version:
1.3.1
Commit fix:
https://github.com/jsummers/imageworsener/commit/a00183107d4b84bc8a714290e824ca9c68dac738
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8326
Reproducer:
https://github.com/asarubbo/poc/blob/master/00271-imageworsener-leftshift
Timeline:
2017-04-13: bug discovered and reported to upstream
2017-04-22: upstream released a patch
2017-04-27: blog post about the issue
2017-04-29: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/27/imageworsener-two-left-shift/
--
Agostino Sarubbo
Gentoo Linux Developer
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