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Gentoo: GLSA-201810-04 Normal: ImageMagick Coder Restrictions

gentoo
Calendar Grey October 6, 2018
Dist Gentoo Esm H88
Gentoo Linux GLSA 201910-05 recommends enhancing security for ImageMagick due to multiple flaws. It is advised to update for protection.
Due to multiple vulnerabilities in various coders used by ImageMagick, Gentoo Linux now installs a policy.xml file which will restrict coder usage by default

Summary

If you process an image with ImageMagick and don't validate the file before (e.g. check magic byte), ImageMagick will call any coders found in the given file. So if ImageMagick will find Ghostscript for example, it will call Ghostscript. Due to multiple -dSAFER sandbox bypass vulnerabilities in Ghostscript, this can lead to arbitrary code execution.
To mitigate this problem we install a policy.xml file by default which will disable PS, EPS, PDF, and XPS coders.

Topics%20covered

Topics Covered

security advisory arbitrary code execution gentoo linux imagick security coder restrictions

Resolution

All ImageMagick 6 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot -v ">=media-gfx/imagemagick-6.9.10.10-r1"
All ImageMagick 7 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot -v ">=media-gfx/imagemagick-7.0.8.10-r1"

References

[ 1 ] Ghostscript contains multiple -dSAFER sandbox bypass vulnerabilities (VU#332928) https://www.kb.cert.org/vuls/id/332928

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201810-04
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: ImageMagick: Security hardening
Date: October 06, 2018
Bugs: #664236
ID: 201810-04

Topics%20covered

Topics Covered

security advisory arbitrary code execution gentoo linux imagick security coder restrictions

Synopsis

Due to multiple vulnerabilities in various coders used by ImageMagick, Gentoo Linux now installs a policy.xml file which will restrict coder usage by default.

Background

ImageMagick is a collection of tools and libraries for many image formats.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 media-gfx/imagemagick < 6.9.10.10-r1 >= 6.9.10.10-r1 < 7.0.8.10-r1 >= 7.0.8.10-r1

Impact

===== A remote attacker, by enticing a user to process a specially crafted image file, could execute arbitrary code with the privileges of the process or cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

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