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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200507-11">
<title>MIT Kerberos 5: Multiple vulnerabilities</title>
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.
<product type="ebuild">mit-krb5</product>
<announced>July 12, 2005</announced>
<revised>July 12, 2005: 01</revised>
<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>
MIT Kerberos 5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.
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).
<impact type="high">
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.
There are no known workarounds at this time.
All MIT Kerberos 5 users should upgrade to the latest available
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=app-crypt/mit-krb5-1.4.1-r1&quot;</code>
<uri link="">CAN-2005-1174</uri>
<uri link="">CAN-2005-1175</uri>
<uri link="">CAN-2005-1689</uri>
<uri link="">MITKRB5-SA-2005-002</uri>
<uri link="">MITKRB5-SA-2005-003</uri>
<metadata tag="requester" timestamp="Fri, 08 Jul 2005 08:49:39 +0000">
<metadata tag="submitter" timestamp="Fri, 08 Jul 2005 14:57:37 +0000">
<metadata tag="bugReady" timestamp="Tue, 12 Jul 2005 19:05:46 +0000">