pfsense 2.3.2: CSRF

Date: 2017-03-24 10:00:00

1. Introduction

2. Overview

pfsense is an open source firewall. The web interface is written in PHP. In version 2.3.2-RELEASE (amd64), the actions of creating and deleting firewall rules are vulnerable to CSRF, enabling an Attacker to edit these rules with a little bit of social engineering.

3. Details

CVSS: Medium; 5.4 https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Description: The easyrule.php script is vulnerable to CSRF, which allows an attacker to create or delete firewall rules via CSRF.

Proof of Concept:

GET /easyrule.php?action=pass&int=LAN&proto=any&src=192.168.1.1&dst=192.168.1.1&dstport=80&ipproto=inet

4. Solution

To mitigate this issue please upgrade at least to version 2.3.3:

https://pfsense.org/download/

Please note that a newer version might already be available.

5. Report Timeline