Ubuntu Security Notice USN-2821-1
30th November, 2015
gnutls26 vulnerability
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
GnuTLS could be made to expose sensitive information over the network.
Software description
- gnutls26
– GNU TLS library
Details
It was discovered that GnuTLS incorrectly validated the first byte of
padding in CBC modes. A remote attacker could possibly use this issue to
perform a padding oracle attack.
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 14.04 LTS:
-
libgnutls26
2.12.23-12ubuntu2.3
- Ubuntu 12.04 LTS:
-
libgnutls26
2.12.14-5ubuntu3.10
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.