[GoSecure Advisory] Neoteris IVE Vulnerability

[Jian Hui Wang <jhwang@xxxxxxxxxxx>]

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 
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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.

 

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