Ubuntu Security Notice USN-678-1
25th November, 2008
gnutls12, gnutls13, gnutls26 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.10
- Ubuntu 8.04 LTS
- Ubuntu 7.10
- Ubuntu 6.06 LTS
Software description
- gnutls12
- gnutls13
- gnutls26
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 man-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 version:
- Ubuntu 8.10:
- libgnutls26 2.4.1-1ubuntu0.1
- Ubuntu 8.04 LTS:
- libgnutls13 2.0.4-1ubuntu2.2
- Ubuntu 7.10:
- libgnutls13 1.6.3-1ubuntu0.2
- Ubuntu 6.06 LTS:
- libgnutls12 1.2.9-2ubuntu1.3
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.