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 Risk: Medium Vendor: Juniper Networks www.juniper.net Advisory URL: http://www.gosecure.ca/SecInfo/gosecure-2004-10.txt Affected System: Neoteris Instant Virtual Extranet (IVE) OS, Version 3.x Netories Instant Virtual Extranet (IVE) OS, Version 4.x Description: 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 management. 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 authentication. The username, authentication server and type will be appended to the ?changepassword.cgi? URL. Since the "changepassword.cgi" allows 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. Solution: The vendor has released a patch and an advisory to address this issue. The advisory is available the following location: http://www.juniper.net/alerts/viewalert.jsp?actionBtn=Seach&txtAlertNumber=PSN-2004-08-25&viewMode=view Credits: 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 Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of Gosecure. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email info@xxxxxxxxxxx for permission. Disclaimer The information within this advisory may change without notice. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatever arising out or in connection with the use or spread of this information. Any use of this information is at the user's own risk. http://www.gosecure.ca
