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Ubuntu Security Notice USN-2058-1
December 18, 2013

curl vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.10
- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

Fraudulent security certificates could allow sensitive information to be
exposed when accessing the Internet.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

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

In general, a standard system update will make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-2058-1
  CVE-2013-6422

Package Information:
  https://launchpad.net/ubuntu/+source/curl/7.32.0-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/curl/7.29.0-1ubuntu3.4
  https://launchpad.net/ubuntu/+source/curl/7.27.0-1ubuntu1.7
  https://launchpad.net/ubuntu/+source/curl/7.22.0-3ubuntu4.6