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Ubuntu Security Notice USN-2048-1

Ubuntu Security Notice USN-2048-1
Posted Dec 6, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2048-1 - 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.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2013-4545
SHA-256 | c20f5794bb126d61a57266741ccbe80c44ddbf98c011ace3654bedddefc949e5

Ubuntu Security Notice USN-2048-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2048-1
December 05, 2013

curl vulnerability
============================================================================

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

- Ubuntu 13.10
- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 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:

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 13.10:
libcurl3 7.32.0-1ubuntu1.1

Ubuntu 13.04:
libcurl3 7.29.0-1ubuntu3.3

Ubuntu 12.10:
libcurl3 7.27.0-1ubuntu1.5

Ubuntu 12.04 LTS:
libcurl3 7.22.0-3ubuntu4.4

Ubuntu 10.04 LTS:
libcurl3 7.19.7-1ubuntu1.4

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

References:
http://www.ubuntu.com/usn/usn-2048-1
CVE-2013-4545

Package Information:
https://launchpad.net/ubuntu/+source/curl/7.32.0-1ubuntu1.1
https://launchpad.net/ubuntu/+source/curl/7.29.0-1ubuntu3.3
https://launchpad.net/ubuntu/+source/curl/7.27.0-1ubuntu1.5
https://launchpad.net/ubuntu/+source/curl/7.22.0-3ubuntu4.4
https://launchpad.net/ubuntu/+source/curl/7.19.7-1ubuntu1.4
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