Ubuntu Security Notice USN-810-1
4th 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 version:
- 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.