CVE-2019-11594 : Exploit Details and Defense Strategies

AdBlock before version 3.45.0 allowed filter-list maintainers to execute custom code during a client-side session, posing a security risk.

Understanding CVE-2019-11594

AdBlock's $rewrite filter option in versions prior to 3.45.0 enabled the execution of arbitrary code by filter-list maintainers during a client-side session.

What is CVE-2019-11594?

This vulnerability in AdBlock allowed for the execution of custom code when a web service loads a script for execution using XMLHttpRequest or Fetch, given the script origin has an open redirect.

The Impact of CVE-2019-11594

The security flaw in AdBlock could potentially lead to unauthorized code execution and compromise the integrity of client-side sessions.

Technical Details of CVE-2019-11594

AdBlock's vulnerability can be further understood through technical details.

Vulnerability Description

The $rewrite filter option in AdBlock versions before 3.45.0 allowed filter-list maintainers to inject custom code during client-side sessions.

Affected Systems and Versions

Product: AdBlock
Vendor: N/A
Versions affected: Prior to 3.45.0

Exploitation Mechanism

The vulnerability could be exploited when a web service loads a script for execution using XMLHttpRequest or Fetch, with the condition that the script origin has an open redirect.

Mitigation and Prevention

Protecting systems from CVE-2019-11594 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update AdBlock to version 3.45.0 or newer to mitigate the vulnerability.
Avoid visiting untrusted websites while using AdBlock to reduce the risk of exploitation.

Long-Term Security Practices

Regularly update browser extensions and plugins to ensure the latest security patches are applied.
Educate users on safe browsing habits and the importance of keeping software up to date.

Patching and Updates

AdBlock users should promptly install updates and patches released by the vendor to address security vulnerabilities.