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Gentoo Linux Security Advisory GLSA 201810-04 |
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https://security.gentoo.org/ |
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Severity: Normal |
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Title: ImageMagick: Security hardening |
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Date: October 06, 2018 |
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Bugs: #664236 |
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ID: 201810-04 |
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Synopsis |
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======== |
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|
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Due to multiple vulnerabilities in various coders used by ImageMagick, |
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Gentoo Linux now installs a policy.xml file which will restrict coder |
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usage by default. |
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Background |
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========== |
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|
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ImageMagick is a collection of tools and libraries for many image |
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formats. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 media-gfx/imagemagick < 6.9.10.10-r1 >= 6.9.10.10-r1 |
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< 7.0.8.10-r1 >= 7.0.8.10-r1 |
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|
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Description |
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=========== |
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|
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If you process an image with ImageMagick and don't validate the file |
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before (e.g. check magic byte), ImageMagick will call any coders found |
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in the given file. So if ImageMagick will find Ghostscript for example, |
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it will call Ghostscript. |
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Due to multiple -dSAFER sandbox bypass vulnerabilities in Ghostscript, |
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this can lead to arbitrary code execution. |
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To mitigate this problem we install a policy.xml file by default which |
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will disable PS, EPS, PDF, and XPS coders. |
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|
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Impact |
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====== |
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|
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A remote attacker, by enticing a user to process a specially crafted |
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image file, could execute arbitrary code with the privileges of the |
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process or cause a Denial of Service condition. |
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All ImageMagick 6 users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot -v ">=media-gfx/imagemagick-6.9.10.10-r1" |
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All ImageMagick 7 users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot -v ">=media-gfx/imagemagick-7.0.8.10-r1" |
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|
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References |
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========== |
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[ 1 ] Ghostscript contains multiple -dSAFER sandbox bypass |
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vulnerabilities (VU#332928) |
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https://www.kb.cert.org/vuls/id/332928 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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https://security.gentoo.org/glsa/201810-04 |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2018 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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https://creativecommons.org/licenses/by-sa/2.5 |
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