USN-810-1: NSS vulnerabilities

4 August 2009

nss vulnerabilities

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software Description

  • nss

Details

Moxie Marlinspike discovered that NSS did not properly handle regular expressions in certificate names. A remote attacker could create a specially crafted certificate to cause a denial of service (via application crash) or execute arbitrary code as the user invoking the program. (CVE-2009-2404)

Moxie Marlinspike and Dan Kaminsky independently discovered that NSS did not properly handle certificates with NULL characters in the certificate name. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications. (CVE-2009-2408)

Dan Kaminsky discovered NSS would still accept certificates with MD2 hash signatures. As a result, an attacker could potentially create a malicious trusted certificate to impersonate another site. (CVE-2009-2409)

Update instructions

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

Ubuntu 9.04
libnss3-1d - 3.12.3.1-0ubuntu0.9.04.1
Ubuntu 8.10
libnss3-1d - 3.12.3.1-0ubuntu0.8.10.1
Ubuntu 8.04 LTS
libnss3-1d - 3.12.3.1-0ubuntu0.8.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system upgrade you need to restart any applications that use NSS, such as Firefox, to effect the necessary changes.

References