CVE-2019-11728 : Security Advisory and Response

A vulnerability in Firefox versions prior to 68 allows malicious websites to exploit the Alt-Svc header for port scanning, potentially compromising user security.

Understanding CVE-2019-11728

This CVE identifies a security flaw in Firefox that enables malicious websites to conduct port scanning through the Alt-Svc header.

What is CVE-2019-11728?

The HTTP Alternative Services header, Alt-Svc, can be abused by malicious sites to scan all TCP ports of accessible hosts while loading web content.

The Impact of CVE-2019-11728

The vulnerability affects Firefox versions before 68, posing a risk of unauthorized port scanning by malicious entities.

Technical Details of CVE-2019-11728

This section delves into the technical aspects of the CVE.

Vulnerability Description

The Alt-Svc header in Firefox versions prior to 68 can be exploited by malicious websites for unauthorized port scanning activities.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 68

Exploitation Mechanism

Malicious websites leverage the Alt-Svc header to scan TCP ports of hosts accessible to users, potentially compromising security.

Mitigation and Prevention

Protective measures to address the CVE.

Immediate Steps to Take

Update Firefox to version 68 or above to mitigate the vulnerability.
Avoid visiting untrusted websites to minimize exposure to potential exploits.

Long-Term Security Practices

Regularly update browsers and security software to prevent known vulnerabilities.
Educate users on safe browsing practices to reduce the risk of falling victim to malicious activities.

Patching and Updates

Mozilla has released patches addressing this vulnerability. Ensure timely installation of updates to safeguard against potential threats.