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CVE-2025-6432: Bypassing SOCKS Proxy Vulnerability in Multi-Account Containers in Firefox

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Overview

The cybersecurity world is currently facing a critical vulnerability that has been identified in the Multi-Account Containers feature of the Firefox browser. This vulnerability, designated as CVE-2025-6432, has the potential to compromise systems and lead to data leakage, posing a significant risk to both individuals and organizations that rely on Firefox for their browsing needs. This blog post aims to provide a detailed understanding of the vulnerability, its potential impact, and the steps needed to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-6432
Severity: Critical (8.6 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

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Product | Affected Versions

Firefox | Versions less than 140

How the Exploit Works

The CVE-2025-6432 vulnerability arises when the Multi-Account Containers feature is enabled in Firefox. Under certain conditions, specifically when the domain name is invalid or the SOCKS proxy is not responding, DNS requests could bypass the SOCKS proxy. This could potentially allow an attacker to intercept or manipulate the DNS requests, leading to system compromise or data leakage.

Conceptual Example Code

Here is an example of how the vulnerability might be exploited:

import socket
target = "victim.example.com"
fake_dns_response = "malicious.example.com"
socks_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socks_socket.bind(('', 0))  # Bind to any available port
# Wait for a connection from the victim's browser
victim_socket, victim_address = socks_socket.accept()
# Receive the DNS request from the victim's browser
dns_request = victim_socket.recv(1024)
# Send a fake DNS response pointing to the attacker's server
victim_socket.sendall(fake_dns_response)
# Now the victim's browser will send its request to the attacker's server

This code is a conceptual example and not meant to be used in real-world scenarios.

Mitigation Guidance

The primary mitigation for this vulnerability is to apply the vendor patch as soon as it is available. Mozilla is likely to release a patch for this in a future version of Firefox. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. These systems can monitor network traffic for malicious activities and can potentially block any attempt to exploit this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.
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