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Gentoo Linux Security Advisory GLSA 200801-09 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: X.Org X server and Xfont library: Multiple vulnerabilities |
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Date: January 20, 2008 |
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Bugs: #204362 |
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ID: 200801-09 |
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Synopsis |
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======== |
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|
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Multiple vulnerabilities have been discovered in the X.Org X server and |
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Xfont library, allowing for a local privilege escalation and arbitrary |
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code execution. |
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|
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Background |
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========== |
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|
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The X Window System is a graphical windowing system based on a |
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client/server model. |
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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-base/xorg-server < 1.3.0.0-r4 >= 1.3.0.0-r4 |
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2 x11-libs/libxfont < 1.3.1-r1 >= 1.3.1-r1 |
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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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Description |
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=========== |
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|
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regenrecht reported multiple vulnerabilities in various X server |
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extension via iDefense: |
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|
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* The XFree86-Misc extension does not properly sanitize a parameter |
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within a PassMessage request, allowing the modification of a function |
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pointer (CVE-2007-5760). |
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|
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* Multiple functions in the XInput extension do not properly sanitize |
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client requests for swapping bytes, leading to corruption of heap |
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memory (CVE-2007-6427). |
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|
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* Integer overflow vulnerabilities in the EVI extension and in the |
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MIT-SHM extension can lead to buffer overflows (CVE-2007-6429). |
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|
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* The TOG-CUP extension does not sanitize an index value in the |
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ProcGetReservedColormapEntries() function, leading to arbitrary |
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memory access (CVE-2007-6428). |
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|
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* A buffer overflow was discovered in the Xfont library when |
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processing PCF font files (CVE-2008-0006). |
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|
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* The X server does not enforce restrictions when a user specifies a |
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security policy file and attempts to open it (CVE-2007-5958). |
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|
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Impact |
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====== |
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|
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Remote attackers could exploit the vulnerability in the Xfont library |
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by enticing a user to load a specially crafted PCF font file resulting |
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in the execution of arbitrary code with the privileges of the user |
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running the X server, typically root. Local attackers could exploit |
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this and the vulnerabilities in the X.org extensions to gain elevated |
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privileges. If the X server allows connections from the network, these |
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vulnerabilities could be exploited remotely. A local attacker could |
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determine the existence of arbitrary files by exploiting the last |
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vulnerability or possibly cause a Denial of Service. |
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|
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Workaround |
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========== |
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|
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Workarounds for some of the vulnerabilities can be found in the X.Org |
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security advisory as listed under References. |
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Resolution |
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========== |
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All X.Org X server users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r4" |
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All X.Org Xfont library users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.3.1-r1" |
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|
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References |
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========== |
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[ 1 ] CVE-2007-5760 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5760 |
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[ 2 ] CVE-2007-5958 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5958 |
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[ 3 ] CVE-2007-6427 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6427 |
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[ 4 ] CVE-2007-6428 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6428 |
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[ 5 ] CVE-2007-6429 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6429 |
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[ 6 ] CVE-2008-0006 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0006 |
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[ 7 ] X.Org security advisory |
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http://lists.freedesktop.org/archives/xorg/2008-January/031918.html |
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|
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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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http://security.gentoo.org/glsa/glsa-200801-09.xml |
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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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License |
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======= |
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Copyright 2008 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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http://creativecommons.org/licenses/by-sa/2.5 |
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