Ubuntu Security Notice USN-2058-1
18th December, 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 13.10
- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
Fraudulent security certificates could allow sensitive information to be exposed when accessing the Internet.
- curl - HTTP, HTTPS, and FTP client and client libraries
Marc Deslauriers discovered that libcurl incorrectly verified CN and SAN
name fields when digital signature verification was disabled in the GnuTLS
backend. When libcurl is being used in this uncommon way by specific
applications, an attacker could exploit this to perform a man in the middle
attack to view sensitive information or alter encrypted communications.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 13.10:
- libcurl3-gnutls 7.32.0-1ubuntu1.2
- Ubuntu 13.04:
- libcurl3-gnutls 7.29.0-1ubuntu3.4
- Ubuntu 12.10:
- libcurl3-gnutls 7.27.0-1ubuntu1.7
- Ubuntu 12.04 LTS:
- libcurl3-gnutls 7.22.0-3ubuntu4.6
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.