[Secure-testing-team] Bug#885941: imagemagick: CVE-2017-17681: CPU exhaustion in ReadPSDChannelZip

[Salvatore Bonaccorso]

Source: imagemagick
Version: 8:6.9.7.4+dfsg-11
Severity: important
Tags: patch security upstream
Forwarded: https://github.com/ImageMagick/ImageMagick/issues/869

Hi,

the following vulnerability was published for imagemagick.

CVE-2017-17681[0]:
| In ImageMagick 7.0.7-12 Q16, an infinite loop vulnerability was found
| in the function ReadPSDChannelZip in coders/psd.c, which allows
| attackers to cause a denial of service (CPU exhaustion) via a crafted
| psd image file.

The fix consist unfortunately on a series of commits. There was a
first attempt to fix the issue with
edf1b9408492b97cd08111a0a9cb123f6391dc5b, then various reverts up to
cae42160e5ab6de4b2a9433267e143ce295ae957, so the final fix might
actually just consit of:

$ git diff cae42160e5ab6de4b2a9433267e143ce295ae957 ^edf1b9408492b97cd08111a0a9cb123f6391dc5b~1 -- coders/psd.c

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2017-17681
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17681
[1] https://github.com/ImageMagick/ImageMagick/issues/869

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore