VAR-200501-0251

Vulnerability from variot - Updated: 2023-12-18 14:07

Nortel Networks Contivity VPN Client displays a different error message depending on whether the username is valid or invalid, which could allow remote attackers to gain sensitive information. It is reported that Nortel Contivity VPN client is susceptible to a username enumeration vulnerability. Attackers may exploit this vulnerability to discern valid usernames. This may aid them in brute force password cracking, or other attacks. Versions prior to 5.01_030 are reported susceptible to this issue. Nortel Networks Contivity VPN Client is the client software for Nortel VPN devices. Name: User Account Enumeration in Nortel Contivity VPN Vendor: Nortel Networks Products Affected: Nortel Networks Contivity VPN Client Type: Remote User Account Enumeration Severity: Medium

I. This bug was discovered as part of a penetration test we carried out on the VPN server of a client.

II. Description 1.

III. Impact The different error messages could enable a malicious person to guess valid user names on the Contivity VPN/Firewall, and then launch password-guessing attacks against these accounts.

IV. Solution This issue is resolved in Contivity VPN Client for Windows V5.01_030

Refer to the CERT VU Note at http://www.kb.cert.org/vuls/id/830214 and our full advisory at http://www.nii.co.in/vuln/contivity.html for information about vendor response, applying the patches, and other technical details.

V. About Network Intelligence India We're a leading provider of information security services and products. Our AuditPro suite of security assessment software provides comprehensive, policy-based security audits for Windows 2000, 2003, XP, Redhat Linux, Sun Solaris, Oracle and MS SQL Servers. For more information, visit us at http://www.nii.co.in

* Happy Diwali AND Eid Mubarak! *

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