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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200801-09">
<title>X.Org X server and Xfont library: Multiple vulnerabilities</title>
<synopsis>
Multiple vulnerabilities have been discovered in the X.Org X server and
Xfont library, allowing for a local privilege escalation and arbitrary code
execution.
</synopsis>
<product type="ebuild">xorg-server libXfont</product>
<announced>2008-01-20</announced>
<revised>2008-03-05: 03</revised>
<bug>204362</bug>
<bug>208343</bug>
<access>remote, local</access>
<affected>
<package name="x11-base/xorg-server" auto="yes" arch="*">
<unaffected range="ge">1.3.0.0-r5</unaffected>
<vulnerable range="lt">1.3.0.0-r5</vulnerable>
</package>
<package name="x11-libs/libXfont" auto="yes" arch="*">
<unaffected range="ge">1.3.1-r1</unaffected>
<vulnerable range="lt">1.3.1-r1</vulnerable>
</package>
</affected>
<background>
<p>
The X Window System is a graphical windowing system based on a
client/server model.
</p>
</background>
<description>
<p>
regenrecht reported multiple vulnerabilities in various X server
extension via iDefense:
</p>
<ul>
<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>
</ul>
</description>
<impact type="high">
<p>
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 X.org 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.
</p>
</impact>
<workaround>
<p>
Workarounds for some of the vulnerabilities can be found in the X.Org
security advisory as listed under References.
</p>
</workaround>
<resolution>
<p>
All X.Org X server users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r5"</code>
<p>
All X.Org Xfont library users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.3.1-r1"</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5760">CVE-2007-5760</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5958">CVE-2007-5958</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6427">CVE-2007-6427</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6428">CVE-2007-6428</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6429">CVE-2007-6429</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0006">CVE-2008-0006</uri>
<uri link="https://lists.freedesktop.org/archives/xorg/2008-January/031918.html">X.Org security advisory</uri>
</references>
<metadata tag="submitter" timestamp="2008-01-05T02:03:56Z">
rbu
</metadata>
<metadata tag="bugReady" timestamp="2008-01-17T15:57:38Z">
p-y
</metadata>
</glsa>
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