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CVE-2021-41282

Status Candidate

Overview

diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.

Related Files

pfSense 2.5.2 Shell Upload
Posted Mar 4, 2022
Authored by Abdel Adim Oisfi, jbaines-r7 | Site metasploit.com

This Metasploit module exploits an arbitrary file creation vulnerability in the pfSense HTTP interface (CVE-2021-41282). The vulnerability affects versions 2.5.2 and below and can be exploited by an authenticated user if they have the "WebCfg - Diagnostics: Routing tables" privilege. This module uses the vulnerability to create a web shell and execute payloads with root privileges.

tags | exploit, web, arbitrary, shell, root
advisories | CVE-2021-41282
SHA-256 | 749bce942f6a26bc40cf265a69c07ac56ab2b47d26b9b02bc8c5c749e022b2a6
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