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Gentoo Linux Security Advisory GLSA 200609-07 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: LibXfont, monolithic X.org: Multiple integer overflows |
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Date: September 13, 2006 |
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Bugs: #145513 |
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ID: 200609-07 |
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Synopsis |
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======== |
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|
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Some buffer overflows were discovered in the CID font parser, |
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potentially resulting in the execution of arbitrary code with elevated |
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privileges. |
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|
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Background |
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========== |
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|
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libXfont is the X.Org Xfont library, some parts are based on the |
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FreeType code base. |
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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 x11-libs/libXfont < 1.2.1 >= 1.2.1 |
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2 x11-base/xorg-x11 < 7.0 >= 7.0 |
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------------------------------------------------------------------- |
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2 affected packages on all of their supported architectures. |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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Several integer overflows have been found in the CID font parser. |
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Impact |
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====== |
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|
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A remote attacker could exploit this vulnerability by enticing a user |
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to load a malicious font file resulting in the execution of arbitrary |
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code with the permissions of the user running the X server which |
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typically is the root user. A local user could exploit this |
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vulnerability to gain elevated privileges. |
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|
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Workaround |
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========== |
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|
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Disable CID-encoded Type 1 fonts by removing the "type1" module and |
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replacing it with the "freetype" module in xorg.conf. |
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Resolution |
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========== |
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All libXfont users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.2.1" |
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All monolithic X.org users are advised to migrate to modular X.org. |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2006-3739 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=2006-3739 |
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[ 2 ] CVE-2006-3740 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=2006-3740 |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200609-07.xml |
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|
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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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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2006 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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http://creativecommons.org/licenses/by-sa/2.5 |
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