The remote host is missing an update to firefox announced via advisory USN-717-3.
Details follow:
Kojima Hajime discovered that Firefox did not properly handle an escaped null character. An attacker may be able to exploit this flaw to bypass script sanitization. (CVE-2008-5510)
Wladimir Palant discovered that Firefox did not restrict access to cookies in HTTP response headers. If a user were tricked into opening a malicious web page, a remote attacker could view sensitive information. (CVE-2009-0357)
Solution: The problem can be corrected by upgrading your system to the following package versions: