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Sandro Gauci

Sandro Gauci, Enable Security

Password policies for PBX servers

Published on Dec 11, 2007 in ,

Password policies form an important part of computer security. Unfortunately a large number of VoIP PBX servers do not apply any policies when it comes to authentication. Because of the lack of such security mechanisms, bruteforce attacks are a viable way to attack PBX servers. Svcrack, which is part of the SIPVicious tool suite, demonstrates this.

Of course, vendors and developers should be cautious when implementing features that can cause a denial of service. For example, the Account Lockout policy (available in Microsoft’s AD and other systems) allows anyone to deny service to another user. This is not such a good idea especially in the case of something as “real time” as the phone service.

On the other hand, trotting or slowing down authentication might be a solution to limit the chance of attackers guessing the password in a reasonable time. Password complexity should also be enforced to hinder brute-force and dictionary attacks.


Sandro Gauci

Sandro Gauci

CEO, Chief Mischief Officer at Enable Security

Sandro Gauci leads the operations and research at Enable Security. He is the original developer of SIPVicious OSS, the SIP security testing toolset. His role is to focus on the vision of the company, design offensive security tools and engage in security research and testing. Therefore, he is the proud owner of the title of Chief Mischief Officer at Enable Security.

He offers public office hours and is reachable here.