Ubuntu Security Notice USN-810-2
4th August, 2009
nspr update
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 9.04
- Ubuntu 8.10
- Ubuntu 8.04 LTS
Software description
- nspr
Details
USN-810-1 fixed vulnerabilities in NSS. This update provides the NSPR
needed to use the new NSS.
Original advisory 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:
- libnspr4-0d 4.7.5-0ubuntu0.9.04.1
- Ubuntu 8.10:
- libnspr4-0d 4.7.5-0ubuntu0.8.10.1
- Ubuntu 8.04 LTS:
- libnspr4-0d 4.7.5-0ubuntu0.8.04.1
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 NSPR, such as Firefox, to effect the necessary changes.