A critical vulnerability has been identified in Fortinet FortiOS and FortiProxy, assigned as CVE-2023-42790. This vulnerability is a stack-based buffer overflow, which allows an attacker to execute unauthorized code or commands on the affected system. The vulnerability affects several versions of Fortinet FortiOS and FortiProxy.

Exploit Details

The stack-based buffer overflow vulnerability in Fortinet FortiOS and FortiProxy can be exploited by sending a specially crafted HTTP request leading to potential unauthorized code execution or unauthorized command execution.

Here's a sample code snipplet demonstrating the vulnerability

# Sample code to demonstrate the vulnerability

import requests

# Replace the target "url" with the affected system's URL
url = "http://<TARGET_IP>/path/to/vulnerable/endpoint";

# Specially crafted HTTP request to exploit the vulnerability

payload = {
  "field1": "A" * 100,  # Overflow the buffer with a large amount of data
  "field2": "malicious_code"  # Inject arbitrary code or commands
}

headers = {
  "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)
print(response.status_code)
print(response.text)

This sample code demonstrates sending an HTTP request with a large amount of data, which overflows the buffer and injects malicious code or commands, potentially leading to unauthorized code execution or unauthorized command execution.

Original References

For more details on the vulnerability and its impact, please refer to the following official resources:

- CVE-2023-42790: NIST National Vulnerability Database
- Fortinet Security Advisory: FG-IR-21-155

Mitigation and Remediation

To protect your systems from this vulnerability, it is highly recommended to upgrade to the latest versions of Fortinet FortiOS and FortiProxy, which contain patches addressing this issue.

FortiProxy: Upgrade to version 7.4.1 or later

For users who cannot immediately upgrade, it is advised to implement strict input validation and filtering mechanisms for incoming HTTP requests to prevent exploitation. Access to vulnerable endpoints should be restricted to trusted networks and users.

Stay vigilant and keep your systems up-to-date to protect them from potential exploits.

Timeline

Published on: 03/12/2024 15:15:46 UTC
Last modified on: 03/19/2024 08:15:06 UTC