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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200801-09">
<title>X.Org X server and Xfont library: Multiple vulnerabilities</title>
Multiple vulnerabilities have been discovered in the X.Org X server and
Xfont library, allowing for a local privilege escalation and arbitrary code
<product type="ebuild">xorg-server libXfont</product>
<announced>January 20, 2008</announced>
<revised>March 05, 2008: 03</revised>
<access>remote, local</access>
<package name="x11-base/xorg-server" auto="yes" arch="*">
<unaffected range="ge"></unaffected>
<vulnerable range="lt"></vulnerable>
<package name="x11-libs/libXfont" auto="yes" arch="*">
<unaffected range="ge">1.3.1-r1</unaffected>
<vulnerable range="lt">1.3.1-r1</vulnerable>
The X Window System is a graphical windowing system based on a
client/server model.
regenrecht reported multiple vulnerabilities in various X server
extension via iDefense:
<li>The XFree86-Misc extension does not properly sanitize a parameter
within a PassMessage request, allowing the modification of a function
pointer (CVE-2007-5760).</li>
<li>Multiple functions in the XInput extension do not properly sanitize
client requests for swapping bytes, leading to corruption of heap
memory (CVE-2007-6427).</li>
<li>Integer overflow vulnerabilities in the EVI extension and in the
MIT-SHM extension can lead to buffer overflows (CVE-2007-6429).</li>
<li>The TOG-CUP extension does not sanitize an index value in the
ProcGetReservedColormapEntries() function, leading to arbitrary memory
access (CVE-2007-6428).</li>
<li>A buffer overflow was discovered in the Xfont library when
processing PCF font files (CVE-2008-0006).</li>
<li>The X server does not enforce restrictions when a user specifies a
security policy file and attempts to open it (CVE-2007-5958).</li>
<impact type="high">
Remote attackers could exploit the vulnerability in the Xfont library
by enticing a user to load a specially crafted PCF font file resulting
in the execution of arbitrary code with the privileges of the user
running the X server, typically root. Local attackers could exploit
this and the vulnerabilities in the extensions to gain elevated
privileges. If the X server allows connections from the network, these
vulnerabilities could be exploited remotely. A local attacker could
determine the existence of arbitrary files by exploiting the last
vulnerability or possibly cause a Denial of Service.
Workarounds for some of the vulnerabilities can be found in the X.Org
security advisory as listed under References.
All X.Org X server users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-base/xorg-server-;</code>
All X.Org Xfont library users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-libs/libXfont-1.3.1-r1&quot;</code>
<uri link="">CVE-2007-5760</uri>
<uri link="">CVE-2007-5958</uri>
<uri link="">CVE-2007-6427</uri>
<uri link="">CVE-2007-6428</uri>
<uri link="">CVE-2007-6429</uri>
<uri link="">CVE-2008-0006</uri>
<uri link="">X.Org security advisory</uri>
<metadata tag="submitter" timestamp="Sat, 05 Jan 2008 02:03:56 +0000">
<metadata tag="bugReady" timestamp="Thu, 17 Jan 2008 15:57:38 +0000">