Firebox PPTP VPN MS-CHAPv2 information disclosure
| firebox-pptpvpn-mschapv2-info-disclosure (41683) |  Low Risk |
Description:
Firebox could allow a remote attacker to obtain sensitive information, caused by a weakness in the PPTP VPN service during MS-CHAPv2 authentication handshakes. A known error code is returned for certain authentication events. An attacker could exploit this vulnerability to enumerate user names and possibly launch further attacks against the system.
Platforms Affected:
- Watchguard, Firebox prior to 10
Remedy:
Upgrade to the latest version of Firebox (10 or later), available from the WatchGuard Web site. See References.
Consequences:
Obtain Information
References:
- MWR InfoSecurity Security Advisory, 4th April 2008, Watchguard Firebox PPTP VPN User Enumeration Vulnerability at http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdf.
- WatchGuard Web site, WatchGuard | Powerful network protection, unified threat management, secure remote access, and expert support at http://www.watchguard.com/.
- BID-28619: WatchGuard Firebox MS-CHAPv2 Authentication Remote User Enumeration Weakness
- CVE-2008-1618: 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.
- FrSIRT/ADV-2008-1152: Watchguard Firebox X Remote VPN User Enumeration Weakness
- SA29708: WatchGuard Firebox Products User Enumeration Weakness
- SECTRACK ID: 1019796: WatchGuard Firebox PPTP VPN Discloses Whether Usernames are Valid or Invalid
Reported:
Apr 04, 2008
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