CVE-2021-39246

medium

Description

Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logged locally, and an attacker might be able to compare them to timestamp data collected by the destination server (or collected by a rogue site within the Tor network).

References

https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability

https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434

https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9

Details

Source: Mitre, NVD

Published: 2021-09-24

Risk Information

CVSS v2

Base Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N

Severity: Low

CVSS v3

Base Score: 6.1

Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: Medium