CVE-2020-8276 Information disclosure in https://github.com/brave/brave-core

Medium 5.5 Published 9 Nov 2020 Updated 4 Aug 2024

Brave Desktop logged timestamps for Tor incognito windows locally, potentially revealing usage patterns to attackers with disk access.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-8276?

CVE-2020-8276 is a medium-severity vulnerability in https://github.com/brave/brave-core, published on 9 Nov 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The implementation of Brave Desktop's privacy-preserving analytics system (P3A) between 1.1 and 1.18.35 logged the timestamp of when the user last opened an incognito window, including Tor windows. The intended behavior was to log the timestamp for incognito windows excluding Tor windows. Note that if a user has P3A enabled, the timestamp is not sent to Brave's server, but rather a value from:Used in last 24hUsed in last week but not 24hUsed in last 28 days but not weekEver used but not in last 28 daysNever usedThe privacy risk is low because a local attacker with disk access cannot tell if the timestamp corresponds to a Tor window or a non-Tor incognito window.

Weakness: CWE-312

Which versions are affected by CVE-2020-8276?

It affects 1 product.

Products include Brave Brave.

How do I fix CVE-2020-8276?

No fix has been published for CVE-2020-8276 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-8276 being exploited?

There is no known exploitation of CVE-2020-8276 in the wild and no public exploit code.

Sources

Also known as GHSA-v36p-6rf8-wx94.