Gentoo: GLSA-201810-04: ImageMagick: Security hardening
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.
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
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.
Background
ImageMagick is a collection of tools and libraries for many image formats.
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.
