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CVE-2008-1618 - Fascial Eve

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.

Reference

http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdf http://www.securityfocus.com/bid/28619 http://www.securitytracker.com/id?1019796 http://secunia.com/advisories/29708 http://www.osvdb.org/44218 http://www.vupen.com/english/advisories/2008/1152/references https://exchange.xforce.ibmcloud.com/vulnerabilities/41683