Description
The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames.
References
- http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdf
- 44218 vdb-entry
- ADV-2008-1152 vdb-entry
- 28619 vdb-entry
- firebox-pptpvpn-mschapv2-info-disclosure(41683) vdb-entry
- 29708 third-party-advisory
- 1019796 vdb-entry