Vulnerability CVE-2021-39246
Published: 2021-09-24

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).

Type:

CWE-532

 (Information Exposure Through Log Files)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.6/10
4.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None

 References:
https://sick.codes/sick-2021-111
https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9
https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability
https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md
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