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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200507-11">
<title>MIT Kerberos 5: Multiple vulnerabilities</title>
<synopsis>
MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote
execution of arbitrary code, possibly leading to the compromise of the
entire Kerberos realm.
</synopsis>
<product type="ebuild">mit-krb5</product>
<announced>July 12, 2005</announced>
<revised>July 12, 2005: 01</revised>
<bug>98799</bug>
<access>remote</access>
<affected>
<package name="app-crypt/mit-krb5" auto="yes" arch="*">
<unaffected range="ge">1.4.1-r1</unaffected>
<vulnerable range="lt">1.4.1-r1</vulnerable>
</package>
</affected>
<background>
<p>
MIT Kerberos 5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.
</p>
</background>
<description>
<p>
Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the
heap by freeing unallocated memory when receiving a special TCP request
(CAN-2005-1174). He also discovered that the same request could lead to
a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered
that krb5_recvauth() function of MIT Kerberos 5 might try to
double-free memory (CAN-2005-1689).
</p>
</description>
<impact type="high">
<p>
Although exploitation is considered difficult, a remote attacker
could exploit the single-byte heap overflow and the double-free
vulnerability to execute arbitrary code, which could lead to the
compromise of the whole Kerberos realm. A remote attacker could also
use the heap corruption to cause a Denial of Service.
</p>
</impact>
<workaround>
<p>
There are no known workarounds at this time.
</p>
</workaround>
<resolution>
<p>
All MIT Kerberos 5 users should upgrade to the latest available
version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=app-crypt/mit-krb5-1.4.1-r1&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1174">CAN-2005-1174</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1175">CAN-2005-1175</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1689">CAN-2005-1689</uri>
<uri link="http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-002-kdc.txt">MITKRB5-SA-2005-002</uri>
<uri link="http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-003-recvauth.txt">MITKRB5-SA-2005-003</uri>
</references>
<metadata tag="requester" timestamp="Fri, 08 Jul 2005 08:49:39 +0000">
koon
</metadata>
<metadata tag="submitter" timestamp="Fri, 08 Jul 2005 14:57:37 +0000">
DerCorny
</metadata>
<metadata tag="bugReady" timestamp="Tue, 12 Jul 2005 19:05:46 +0000">
jaervosz
</metadata>
</glsa>