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USN-678-2: GnuTLS regression

10 December 2008

GnuTLS regression

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Releases

Packages

Details

USN-678-1 fixed a vulnerability in GnuTLS. The upstream patch introduced a
regression when validating certain certificate chains that would report valid
certificates as untrusted. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Martin von Gagern discovered that GnuTLS did not properly verify certificate
chains when the last certificate in the chain was self-signed. If a remote
attacker were able to perform a machine-in-the-middle attack, this flaw could be
exploited to view sensitive information. (CVE-2008-4989)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 8.10
Ubuntu 8.04
Ubuntu 7.10
Ubuntu 6.06

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