CVE-2019-11595 : What You Need to Know

uBlock before version 0.9.5.15 allows filter-list maintainers to execute custom code in a client-side session, posing a security risk.

Understanding CVE-2019-11595

This CVE highlights a vulnerability in uBlock that enables the execution of arbitrary code by filter-list maintainers.

What is CVE-2019-11595?

Before version 0.9.5.15 of uBlock, the $rewrite filter option allows maintainers to run custom code in a client-side session when a web service loads a script using XMLHttpRequest or Fetch, and the script origin has an open redirect.

The Impact of CVE-2019-11595

The vulnerability can be exploited by malicious actors to execute arbitrary code on the client-side, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2019-11595

This section delves into the specifics of the vulnerability.

Vulnerability Description

In uBlock before 0.9.5.15, the $rewrite filter option enables maintainers of filter-lists to execute custom code in a client-side session when a script is loaded using XMLHttpRequest or Fetch and the script origin contains an open redirect.

Affected Systems and Versions

Product: uBlock
Versions affected: Before 0.9.5.15

Exploitation Mechanism

The vulnerability is exploited when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin contains an open redirect.

Mitigation and Prevention

Protecting systems from CVE-2019-11595 is crucial to prevent potential security breaches.

Immediate Steps to Take

Update uBlock to version 0.9.5.15 or newer to mitigate the vulnerability.
Avoid clicking on suspicious links or visiting untrusted websites.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Implement strong security measures such as firewalls and intrusion detection systems.

Patching and Updates

Ensure that uBlock is regularly updated to the latest version to address security flaws and protect against potential exploits.