Ubuntu Security Notice USN-2540-1
23rd March, 2015
gnutls26, gnutls28 vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS
Summary
Several security issues were fixed in GnuTLS.
Software description
- gnutls26
– GNU TLS library - gnutls28
– GNU TLS library
Details
It was discovered that GnuTLS did not perform date and time checks on
CA certificates, contrary to expectations. This issue only affected
Ubuntu 10.04 LTS. (CVE-2014-8155)
Nikos Mavrogiannopoulos discovered that GnuTLS incorrectly verified that
signature algorithms matched. A remote attacker could possibly use this
issue to downgrade to a disallowed algorithm. This issue only affected
Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-0282)
It was discovered that GnuTLS incorrectly verified certificate algorithms.
A remote attacker could possibly use this issue to downgrade to a
disallowed algorithm. (CVE-2015-0294)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 14.10:
-
libgnutls-deb0-28
3.2.16-1ubuntu2.2
- Ubuntu 14.04 LTS:
-
libgnutls26
2.12.23-12ubuntu2.2
- Ubuntu 12.04 LTS:
-
libgnutls26
2.12.14-5ubuntu3.9
- Ubuntu 10.04 LTS:
-
libgnutls26
2.8.5-2ubuntu0.7
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.