USN-881-1: Kerberos vulnerability

January 13th, 2010 • Related • Filed Under
Referenced CVEs: 
CVE-2009-4212

Description: 
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Ubuntu Security Notice USN-881-1 January 12, 2010
krb5 vulnerability
CVE-2009-4212
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A security issue affects the following Ubuntu releases:

Ubuntu 6.06 LTS
Ubuntu 8.04 LTS
Ubuntu 8.10
Ubuntu 9.04
Ubuntu 9.10

This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to the
following package versions:

Ubuntu 6.06 LTS:
libkrb53 1.4.3-5ubuntu0.10

Ubuntu 8.04 LTS:
libkrb53 1.6.dfsg.3~beta1-2ubuntu1.3

Ubuntu 8.10:
libkrb53 1.6.dfsg.4~beta1-3ubuntu0.3

Ubuntu 9.04:
libkrb53 1.6.dfsg.4~beta1-5ubuntu2.2

Ubuntu 9.10:
libk5crypto3 1.7dfsg~beta3-1ubuntu0.3

In general, a standard system upgrade is sufficient to effect the
necessary changes.

Details follow:

It was discovered that Kerberos did not correctly handle invalid AES
blocks. An unauthenticated remote attacker could send specially crafted
traffic that would crash the KDC service, leading to a denial of service,
or possibly execute arbitrary code with root privileges.

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