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Ubuntu Security Notice USN-1052-1 January 26, 2011
openjdk-6, openjdk-6b18 vulnerability
CVE-2010-4351
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A security issue affects the following Ubuntu releases:

Ubuntu 9.10
Ubuntu 10.04 LTS
Ubuntu 10.10

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 9.10:
icedtea6-plugin 6b20-1.9.4-0ubuntu1~9.10.1

Ubuntu 10.04 LTS:
icedtea6-plugin 6b20-1.9.4-0ubuntu1~10.04.1

Ubuntu 10.10:
icedtea6-plugin 6b20-1.9.4-0ubuntu1

After a standard system update you need to restart any Java services,
applications or applets to make all the necessary changes.

Details follow:

It was discovered that the JNLP SecurityManager in IcedTea for Java
OpenJDK in some instances failed to properly apply the intended
scurity policy in its checkPermission method. This could allow an
attacker execute code with privileges that should have been prevented.
(CVE-2010-4351)