USN-678-2: GnuTLS regression

Releases

• Ubuntu 8.10
• Ubuntu 8.04
• Ubuntu 7.10
• Ubuntu 6.06

Packages

• gnutls12 -
• gnutls13 -
• gnutls26 -

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)

Update instructions

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

Ubuntu 8.10

• libgnutls26 - 2.4.1-1ubuntu0.2

Ubuntu 8.04

• libgnutls13 - 2.0.4-1ubuntu2.3

Ubuntu 7.10

• libgnutls13 - 1.6.3-1ubuntu0.3

Ubuntu 6.06

• libgnutls12 - 1.2.9-2ubuntu1.4

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

References

• https://launchpad.net/bugs/305264