The remote host is missing an update to nss announced via advisory USN-810-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: libnss3-1d 3.12.3.1-0ubuntu0.8.04.1 Ubuntu 8.10: libnss3-1d 3.12.3.1-0ubuntu0.8.10.1 Ubuntu 9.04: libnss3-1d 3.12.3.1-0ubuntu0.9.04.1 After a standard system upgrade you need to restart an applications that use NSS, such as Firefox, to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-810-1

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)