Ubuntu: 2048-2: curl regression
Posted by Benjamin D. Thomas   
Ubuntu USN-2048-1 introduced a regression in curl.
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Ubuntu Security Notice USN-2048-2
December 06, 2013

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

USN-2048-1 introduced a regression in curl.

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

Details:

USN-2048-1 fixed a vulnerability in curl. The security fix uncovered a bug
in the curl command line tool which resulted in the --insecure (-k) option
not working as intended. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 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 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 12.10:
  libcurl3                        7.27.0-1ubuntu1.6

Ubuntu 12.04 LTS:
  libcurl3                        7.22.0-3ubuntu4.5

Ubuntu 10.04 LTS:
  libcurl3                        7.19.7-1ubuntu1.5

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

References:
  http://www.ubuntu.com/usn/usn-2048-2
  http://www.ubuntu.com/usn/usn-2048-1
  https://launchpad.net/bugs/1258366

Package Information:
  https://launchpad.net/ubuntu/+source/curl/7.27.0-1ubuntu1.6
  https://launchpad.net/ubuntu/+source/curl/7.22.0-3ubuntu4.5
  https://launchpad.net/ubuntu/+source/curl/7.19.7-1ubuntu1.5