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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201110-19">
<title>X.Org X Server: Multiple vulnerabilities</title>
<synopsis>Multiple vulnerabilities in the X.Org X server might allow local
attackers to disclose information.
</synopsis>
<product type="ebuild">xorg-server</product>
<announced>October 22, 2011</announced>
<revised>October 22, 2011: 2</revised>
<bug>387069</bug>
<access>local</access>
<affected>
<package name="x11-base/xorg-server" auto="yes" arch="*">
<unaffected range="rge">1.9.5-r1</unaffected>
<unaffected range="ge">1.10.4-r1</unaffected>
<vulnerable range="lt">1.10.4-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>vladz reported the following vulnerabilities in the X.Org X server:</p>
<ul>
<li>The X.Org X server follows symbolic links when trying to access the
lock file for a X display, showing a predictable behavior depending on
the file type of the link target (CVE-2011-4028).
</li>
<li>The X.Org X server lock file mechanism allows for a race condition to
cause the X server to modify the file permissions of an arbitrary file
to 0444 (CVE-2011-4029).
</li>
</ul>
</description>
<impact type="normal">
<p>A local attacker could exploit these vulnerabilities to disclose
information by making arbitrary files on a system world-readable or gain
information whether a specified file exists on the system and whether it
is a file, directory, or a named pipe.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=x11-base/xorg-server-1.9.5-r1"
</code>
<p>All X.Org X Server 1.10 users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=x11-base/xorg-server-1.10.4-r1"
</code>
</resolution>
<references>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4028">CVE-2011-4028</uri>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4029">CVE-2011-4029</uri>
</references>
<metadata timestamp="Thu, 13 Oct 2011 20:53:51 +0000" tag="requester">a3li</metadata>
<metadata timestamp="Sat, 22 Oct 2011 17:19:57 +0000" tag="submitter">a3li</metadata>
</glsa>