Researcher found an Information Disclosure in the Brave browser

Security researcher discovered an Information Disclosure vulnerability in Brave browser and reported it through the HackerOne platform.

Security researcher Kirtikumar Anandrao Ramchandani discovered an Information Disclosure vulnerability in the Brave Browser and reported it to the company through the HackerOne platform.

The researcher discovered that when the browser is used with Tor it could leak the referer.

“Brave browser has a function of New Private Window with Tor. The browser when used with Tor shouldn’t leak the referer.” reads the report submitted to HackerOne.

Below is the procedure to reproduce the issue:

Visit exploit.
Click on https://www.whatismybrowser.com/.

Expected behavior: It should have shown a blank referrer;

Actual behavior: It shows the referrer as: kirtikumarar.com which was the host from where we navigated.

The following screenshot shows the expected behavior:

The expert also published a video POC on the report page showing the expected behavior.

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Pierluigi Paganini

(SecurityAffairs – hacking, Brave)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.