Juniper NetScreen IVE Lets Remote Users Conduct Brute-Force Password Guessing Attacks
SecurityTracker Alert ID: 1011552|
SecurityTracker URL: http://securitytracker.com/id/1011552
(Links to External Site)
Date: Oct 6 2004
Host/resource access via network|
Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes |
Version(s): 3.x, 4.x|
GoSecure reported a vulnerability in the Juniper NetScreen (Neoteris) IVE in 'changepassword.cgi'. A remote user can conduct unlimited brute-force password guessing attempts.|
When a user's password expires and the user subsequently attempts to authenticate to the system, the user is presented with the 'changepassword.cgi' script without having to authenticate. This script allows the user to attempt to login with the expired password without limiting the number of authentication attempts. As a result, a remote user with knowledge of a valid user account that has an expired password can conduct a brute force password guessting attack.
Only systems that are configured with an LDAP or NT domain authentication server are affected.
The original advisory is available at:
A remote user can conduct brute-force password guessing attacks.|
The vendor has issued a fix.|
More information is available to registered customers at:
Vendor URL: www.juniper.net/ (Links to External Site)
Source Message Contents
Subject: [GoSecure Advisory] Neoteris IVE Vulnerability|
GoSecure Advisory #GS041006
Neoteris IVE changepassword.cgi Authentication Bypass
Date Published: 2004-10-06
Date Discovered: 2004-07-23
CVE ID: CAN-2004-0939
Class: Design Error
Vendor: Juniper Networks
Neoteris Instant Virtual Extranet (IVE) OS, Version 3.x Netories Instant
Virtual Extranet (IVE) OS, Version 4.x
Neoteris Instant Virtual Extranet (IVE) is a well known "clientless" SSL
VPN solution for internal network remote access via a standard web
browser. It is widely used as an extranet portal for corporate networks.
While doing an ethical hacking assessment of a Juniper customer,
GoSecure discovered a vulnerability regarding Neoteris IVE password
When a valid user tries to authenticate via the IVE and the password is
expired, the user will be asked to change their password and be directly
forwarded to the "changepassword.cgi" without asking for any form of
The username, authentication server and type will be appended to the
user to try the old password as many times as they want, the unit
effectively allows a brute force password attack.
If an attacker were to obtain a username through various public
information gathering techniques, they could attempt to find an account
with a password that has expired and brute force that account to
eventually gain unauthorized access.
This vulnerability only affects IVE products that are configured with
LDAP or an NT domain authentication server. Other type of authentication
servers are not affected.
The vendor has released a patch and an advisory to address this issue.
The advisory is available the following location:
GoSecure would like to thank Juniper's quick response on providing a
solution for its customers. This vulnerability was found by Jian Hui
Wang, part of GoSecure's vulnerability research team.
Copyright (c) 2002-2004 GoSecure Inc
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