Vulnerability Monitor

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CVE-2021-39246

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).

Published

2021-09-24T19:15:07.147

Last Modified

2024-11-21T06:19:00.780

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.1 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:N

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

3.9

Impact Score

4.9

Weaknesses

Type: Primary
CWE-532

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	torproject	tor_browser	≤ 10.5.6	Yes
Application	torproject	tor_browser	11.0	Yes
Application	torproject	tor_browser	11.0	Yes
Operating System	apple	macos	-	No
Operating System	linux	linux_kernel	-	No
Operating System	microsoft	windows	-	No

References

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Exploit, Third Party Advisory ([email protected])
https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Patch, Vendor Advisory ([email protected])
https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Vendor Advisory ([email protected])
https://sick.codes/sick-2021-111 Exploit, Third Party Advisory ([email protected])
https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability Third Party Advisory ([email protected])
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://sick.codes/sick-2021-111 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)