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USN-2058-1: curl vulnerability

18 December 2013

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 machine-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
Ubuntu 13.04
Ubuntu 12.10
Ubuntu 12.04

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