Your submission was sent successfully! Close

USN-2048-1: curl vulnerability

5 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


Scott Cantor discovered that libcurl incorrectly verified CN and SAN name
fields when digital signature verification was disabled. 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
Ubuntu 10.04

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