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Gentoo Linux Security Advisory 200904-9

Gentoo Linux Security Advisory 200904-9
Posted Apr 8, 2009
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory GLSA 200904-09 - Multiple vulnerabilites in MIT Kerberos 5 might allow remote unauthenticated users to execute arbitrary code with root privileges. Versions less than 1.6.3-r6 are affected.

tags | advisory, remote, arbitrary, root
systems | linux, gentoo
advisories | CVE-2009-0844, CVE-2009-0845, CVE-2009-0846, CVE-2009-0847
MD5 | 8a7e34a777d44530639d4f9a00bf7620

Gentoo Linux Security Advisory 200904-9

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Gentoo Linux Security Advisory GLSA 200904-09
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http://security.gentoo.org/
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Severity: High
Title: MIT Kerberos 5: Multiple vulnerabilities
Date: April 08, 2009
Bugs: #262736, #263398
ID: 200904-09

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Synopsis
========

Multiple vulnerabilites in MIT Kerberos 5 might allow remote
unauthenticated users to execute arbitrary code with root privileges.

Background
==========

MIT Kerberos 5 is a suite of applications that implement the Kerberos
network protocol. kadmind is the MIT Kerberos 5 administration daemon,
KDC is the Key Distribution Center.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-crypt/mit-krb5 < 1.6.3-r6 >= 1.6.3-r6

Description
===========

Multiple vulnerabilities have been reported in MIT Kerberos 5:

* A free() call on an uninitialized pointer in the ASN.1 decoder when
decoding an invalid encoding (CVE-2009-0846).

* A buffer overread in the SPNEGO GSS-API application, reported by
Apple Product Security (CVE-2009-0844).

* A NULL pointer dereference in the SPNEGO GSS-API application,
reported by Richard Evans (CVE-2009-0845).

* An incorrect length check inside an ASN.1 decoder leading to
spurious malloc() failures (CVE-2009-0847).

Impact
======

A remote unauthenticated attacker could exploit the first vulnerability
to cause a Denial of Service or, in unlikely circumstances, execute
arbitrary code on the host running krb5kdc or kadmind with root
privileges and compromise the Kerberos key database. Exploitation of
the other vulnerabilities might lead to a Denial of Service in kadmind,
krb5kdc, or other daemons performing authorization against Kerberos
that utilize GSS-API or an information disclosure.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MIT Kerberos 5 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.6.3-r6"

References
==========

[ 1 ] CVE-2009-0844
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0844
[ 2 ] CVE-2009-0845
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0845
[ 3 ] CVE-2009-0846
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0846
[ 4 ] CVE-2009-0847
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0847

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200904-09.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5
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