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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201201-12">
<title>Tor: Multiple vulnerabilities</title>
<synopsis>Multiple vulnerabilities have been found in Tor, the most severe of
which may allow a remote attacker to execute arbitrary code.
</synopsis>
<product type="ebuild">Tor</product>
<announced>January 23, 2012</announced>
<revised>January 23, 2012: 1</revised>
<bug>388769</bug>
<bug>394969</bug>
<access>remote</access>
<affected>
<package name="net-misc/tor" auto="yes" arch="*">
<unaffected range="ge">0.2.2.35</unaffected>
<vulnerable range="lt">0.2.2.35</vulnerable>
</package>
</affected>
<background>
<p>Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.
</p>
</background>
<description>
<p>Multiple vulnerabilities have been discovered in Tor:</p>
<ul>
<li>When configured as client or bridge, Tor uses the same TLS
certificate chain for all outgoing connections (CVE-2011-2768).
</li>
<li>When configured as a bridge, Tor relays can distinguish incoming
bridge connections from client connections (CVE-2011-2769).
</li>
<li>An error in or/buffers.c could result in a heap-based buffer overflow
(CVE-2011-2778).
</li>
</ul>
</description>
<impact type="normal">
<p>A remote attacker could possibly execute arbitrary code or cause a
Denial of Service. Furthermore, a remote relay the user is directly
connected to may be able to disclose anonymous information about that
user or enumerate bridges in the user's connection.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All Tor users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=net-misc/tor-0.2.2.35"
</code>
</resolution>
<references>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2768">CVE-2011-2768</uri>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2769">CVE-2011-2769</uri>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2778">CVE-2011-2778</uri>
</references>
<metadata timestamp="Sun, 01 Jan 2012 17:49:33 +0000" tag="requester">
underling
</metadata>
<metadata timestamp="Mon, 23 Jan 2012 19:55:45 +0000" tag="submitter">ackle</metadata>
</glsa>