Ubuntu Security Notice USN-1752-1
27th February, 2013
gnutls13, gnutls26 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
GnuTLS could be made to expose sensitive information over the network.
- gnutls13 - GNU TLS library
- gnutls26 - GNU TLS library
Nadhem Alfardan and Kenny Paterson discovered that the TLS protocol as used
in GnuTLS was vulnerable to a timing side-channel attack known as the
"Lucky Thirteen" issue. A remote attacker could use this issue to perform
plaintext-recovery attacks via analysis of timing data.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.10:
- libgnutls26 2.12.14-5ubuntu4.2
- Ubuntu 12.04 LTS:
- libgnutls26 2.12.14-5ubuntu3.2
- Ubuntu 11.10:
- libgnutls26 2.10.5-1ubuntu3.3
- Ubuntu 10.04 LTS:
- libgnutls26 2.8.5-2ubuntu0.3
- Ubuntu 8.04 LTS:
- libgnutls13 2.0.4-1ubuntu2.9
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.