A weakness has been identified in WatchGuard Firebox products, which could be exploited by attackers to gain knowledge of sensitive information. This issue is caused by an error in the PPTP VPN service that sends different responses to valid and invalid usernames supplied via MS-CHAPv2 packets, which could be exploited by remote unauthenticated attackers to determine if a guessed username is valid.
Credits
Vulnerability reported by Luke Jennings.
ChangeLog
2008-04-09 : Initial release
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