CVE-2021-46702 Information disclosure in n/a

Medium 5.5 Published 26 Feb 2022 Updated 4 Aug 2024

Local attackers can read RAM to bypass anonymity and reveal visited onion services due to improper memory freeing in Tor Browser.

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-2021-46702?

CVE-2021-46702 is a medium-severity vulnerability in n/a, published on 26 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Tor Browser 9.0.7 on Windows 10 build 10586 is vulnerable to information disclosure. This could allow local attackers to bypass the intended anonymity feature and obtain information regarding the onion services visited by a local user. This can be accomplished by analyzing RAM memory even several hours after the local user used the product. This occurs because the product doesn't properly free memory.

Weakness: CWE-404

Which versions are affected by CVE-2021-46702?

It affects 1 product.

Products include Torproject Tor.

How do I fix CVE-2021-46702?

No fix has been published for CVE-2021-46702 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-46702 being exploited?

There is no known exploitation of CVE-2021-46702 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-5rfp-95m3-27h9.