Secunia Security Advisory – Nortel has acknowledged a vulnerability in some Nortel products, which can be exploited by malicious people to conduct spoofing attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75286/sa34087.txt
Source: https://packetstormsecurity.com/files/75286/Secunia-Security-Advisory-34087.html