Ubuntu: 1804-2: IcedTea-Web regression
Posted by Benjamin D. Thomas   
Ubuntu Due to a regression, IcedTea-Web might not be able to access some sites.
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Ubuntu Security Notice USN-1804-2
April 23, 2013

icedtea-web regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS
- Ubuntu 11.10

Summary:

Due to a regression, IcedTea-Web might not be able to access some sites.

Software Description:
- icedtea-web: A web browser plugin to execute Java applets

Details:

USN-1804-1 fixed vulnerabilities in IcedTea-Web. This update introduced
a regression with the Java Network Launching Protocol (JNLP) when fetching
content over SSL under certain configurations, such as when using the
community-supported IcedTead 7 browser plugin. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

 Jiri Vanek discovered that IcedTea-Web would use the same classloader for
 applets from different domains. A remote attacker could exploit this to
 expose sensitive information or potentially manipulate applets from other
 domains. (CVE-2013-1926)

 It was discovered that IcedTea-Web did not properly verify JAR files and
 was susceptible to the GIFAR attack. If a user were tricked into opening a
 malicious website, a remote attacker could potentially exploit this to
 execute code under certain circumstances. (CVE-2013-1927)

Update instructions:

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

Ubuntu 12.04 LTS:
  icedtea-7-plugin                1.2.3-0ubuntu0.12.04.2
  icedtea-netx                    1.2.3-0ubuntu0.12.04.2

Ubuntu 11.10:
  icedtea-netx                    1.2.3-0ubuntu0.11.10.2

After a standard system update you need to restart your browser to make
all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1804-2
  http://www.ubuntu.com/usn/usn-1804-1
  https://launchpad.net/bugs/1171506

Package Information:
  https://launchpad.net/ubuntu/+source/icedtea-web/1.2.3-0ubuntu0.12.04.2
  https://launchpad.net/ubuntu/+source/icedtea-web/1.2.3-0ubuntu0.11.10.2