'0.0.0.0 Day' Flaw Puts Chrome, Firefox, Mozilla Browsers at RCE Risk

A critical vulnerability named "0.0.0.0 Day" has been identified, affecting major web browsers, including Chrome, Safari, and Firefox. This flaw allows attackers to remotely execute code (RCE) by exploiting the 0.0.0.0 IP address. The vulnerability permits attackers to interact with services running on an organization's local network from outside, potentially leading to unauthorized access to user data, malware deployment, and other malicious activities. The flaw is attributed to inconsistent implementation of security mechanisms across different browsers and a lack of standardization in the industry.

Severity: Critical  

This vulnerability allows remote code execution and can be used to launch a wide range of attacks, including data theft and malware distribution. The ease of exploitation across multiple browsers and its potential impact on local networks elevate the threat level to critical.

Affected Regions:

The threat is global, as the vulnerability affects widely used web browsers across various regions. Any organization or individual using vulnerable browsers could be at risk.

Indicators of Compromise (IOC):

• IP Address: 0.0.0.0

• Techniques Used: Exploitation of localhost APIs via browser vulnerabilities 

• Potential Attack Patterns: Requests sent to localhost (127.0.0.1) or 0.0.0.0

• Campaigns: ShadowRay, SeleniumGreed, ShellTorch

  
  

Attack Chains:

1. Initial Access: The attacker sends a specially crafted HTTP request to the victim's browser, exploiting the 0.0.0.0 IP address..

2. Execution: The request interacts with services running on the local network, bypassing browser security mechanisms such as CORS and PNA.

3. Persistence: A reverse shell is established on the victim’s machine, allowing the attacker continuous access.

4. Command and Control: The attacker gains control of the system, potentially leading to data theft, malware deployment, or further exploitation.

Remediation:

1. Browser Updates: Ensure that all browsers (Chrome, Safari, Firefox) are updated to the latest versions, which include patches for this vulnerability.

2. Network Configuration:

   1. Implement PNA headers to enforce strict network segmentation.

   2. Verify HOST headers in network requests to prevent DNS rebinding attacks targeting localhost.

   3. Add authorization layers to services, even those running on localhost.

   4. Avoid trusting localhost networks without additional security checks.

3. Application Security:

   1. Use HTTPS instead of HTTP whenever possible.

   2. Implement Cross-Site Request Forgery (CSRF) tokens in all applications, including those running locally.

4. Awareness: Educate users about the risks associated with clicking on unknown links, particularly those received via email, as these can trigger the exploit.

---

Reference:

 '0.0.0.0 Day' Flaw Puts Chrome, Firefox, Mozilla Browsers at RCE Risk (darkreading.com)

---