Vulnerability CVE-2008-1618
Published: 2008-04-07   Modified: 2012-02-12

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.

Type:

CWE-200

 (Information Exposure)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Watchguard -> Firebox pptp vpn 

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