uBlock Origin

Security Report: uBlock Origin Chrome Extension

Summary

uBlock Origin is a popular Chrome extension that provides ad-blocking and content filtering capabilities, with over 50 million users. However, our analysis reveals critical security concerns that warrant attention. The extension's risk score is 100/100 due to its extensive permissions and potential for code injection attacks.

The most significant finding is the use of eval() in the extension's code, which can execute arbitrary JavaScript code and pose a high risk to user security and privacy.

Permission Analysis

• privacy: This permission allows the extension to access sensitive information such as browsing history, cookies, and local storage.


• webRequest and webRequestBlocking: These permissions enable the extension to intercept and modify HTTP requests, which can be used for malicious purposes if exploited.


• <all_urls>: This permission grants the extension access to all URLs visited by the user, including sensitive information such as login credentials.


These permissions are broader than necessary for an ad-blocking extension and pose a significant risk to user security and privacy.



Code Analysis



Our code analysis reveals several concerning findings:


• eval() used: The extension uses eval() to execute JavaScript code, which can lead to code injection attacks. This allows malicious actors to inject arbitrary code into the extension's context, potentially stealing sensitive information or taking control of the user's browser.


• Makes HTTP requests: The extension makes external network connections to various domains, including GitHub and Reddit, which may be necessary for its functionality but also introduces potential security risks.




Network Activity



The extension connects to several external services, including:


• GitHub (github.com)


• Reddit (www.reddit.com)


• Mozilla developer resources (developer.mozilla.org)


These connections are likely necessary for the extension's functionality, such as fetching filter lists and updating the extension. However, they also introduce potential security risks if not properly secured.



Risk Assessment



Overall risk rating: Critical (100/100)

The most at-risk users are:


• Enterprise users who may have sensitive information stored in their browsers


• General consumers who use the extension for ad-blocking purposes and may be unaware of its security implications


• Specific threat models, such as attackers targeting browser-based vulnerabilities




Recommendations



Based on our analysis, we strongly advise against installing this extension unless absolutely necessary. Users should exercise caution when using uBlock Origin and monitor their browser's behavior closely.

To mitigate potential risks:


• Regularly update the extension to ensure you have the latest security patches


• Use a reputable antivirus solution to scan your browser for malware


• Consider alternative ad-blocking extensions with better security track records

In conclusion, while uBlock Origin is a popular and useful extension, its critical security concerns warrant attention. Users should exercise caution when using this extension and consider alternative options to minimize potential risks.