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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200806-07">
<title>X.Org X server: Multiple vulnerabilities</title>
<synopsis>
Multiple vulnerabilities have been discovered in the X.Org X server,
possibly allowing for the remote execution of arbitrary code with root
privileges.
</synopsis>
<product type="ebuild">xorg-server</product>
<announced>2008-06-19</announced>
<revised count="01">2008-06-19</revised>
<bug>225419</bug>
<access>remote, local</access>
<affected>
<package name="x11-base/xorg-server" auto="yes" arch="*">
<unaffected range="ge">1.3.0.0-r6</unaffected>
<vulnerable range="lt">1.3.0.0-r6</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
extensions via iDefense:
</p>
<ul>
<li>The
SProcSecurityGenerateAuthorization() and SProcRecordCreateContext()
functions of the RECORD and Security extensions are lacking proper
parameter validation (CVE-2008-1377).</li>
<li>An integer overflow is
possible in the function ShmPutImage() of the MIT-SHM extension
(CVE-2008-1379).</li>
<li>The RENDER extension contains several
possible integer overflows in the AllocateGlyph() function
(CVE-2008-2360) which could possibly lead to a heap-based buffer
overflow. Further possible integer overflows have been found in the
ProcRenderCreateCursor() function (CVE-2008-2361) as well as in the
SProcRenderCreateLinearGradient(), SProcRenderCreateRadialGradient()
and SProcRenderCreateConicalGradient() functions (CVE-2008-2362).</li>
</ul>
</description>
<impact type="high">
<p>
Exploitation of these vulnerabilities could possibly lead to the remote
execution of arbitrary code with root privileges, if the server is
running as root, which is the default. It is also possible to crash the
server by making use of these vulnerabilities.
</p>
</impact>
<workaround>
<p>
It is possible to avoid these vulnerabilities by disabling the affected
server extensions. Therefore edit the configuration file
(/etc/X11/xorg.conf) to contain the following in the appropriate
places:
</p>
<code>
Section "Extensions"
Option "MIT-SHM" "disable"
Option "RENDER" "disable"
Option "SECURITY" "disable"
EndSection
Section "Module"
Disable "record"
EndSection</code>
</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-r6"</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1377">CVE-2008-1377</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1379">CVE-2008-1379</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2360">CVE-2008-2360</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2361">CVE-2008-2361</uri>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2362">CVE-2008-2362</uri>
</references>
<metadata tag="submitter" timestamp="2008-06-11T10:16:02Z">
vorlon
</metadata>
<metadata tag="bugReady" timestamp="2008-06-16T08:09:32Z">
vorlon
</metadata>
</glsa>
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