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Ubuntu Security Notice USN-1055-1 February 01, 2011
openjdk-6, openjdk-6b18 vulnerabilities
CVE-2010-4351, CVE-2011-0025
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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 6b20-1.9.5-0ubuntu1~9.10.1

Ubuntu 10.04 LTS:
icedtea6-plugin 6b20-1.9.5-0ubuntu1~10.04.1

Ubuntu 10.10:
icedtea6-plugin 6b20-1.9.5-0ubuntu1

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 IcedTea for Java did not properly verify
signatures when handling multiply signed or partially signed JAR files,
allowing an attacker to cause code to execute that appeared to come
from a verified source. (CVE-2011-0025)

USN 1052-1 fixed a vulnerability in OpenJDK for Ubuntu 9.10 and Ubuntu
10.04 LTS on all architectures, and Ubuntu 10.10 for all architectures
except for the armel (ARM) architecture. This update provides the
corresponding update for Ubuntu 10.10 on the armel (ARM) architecture.

Original advisory details:

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 to execute code with privileges that should have been
prevented. (CVE-2010-4351)