CVE-2021-39246
Tor Browser V2 Onion Address Correlation Information Leak
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).
INFO
Published Date :
Sept. 24, 2021, 7:15 p.m.
Last Modified :
Nov. 21, 2024, 6:19 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.2
Exploitability Score :
0.9
Affected Products
The following products are affected by CVE-2021-39246
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-39246.
| URL | Resource |
|---|---|
| https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md | Exploit Third Party Advisory |
| https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 | Patch Vendor Advisory |
| https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 | Vendor Advisory |
| https://sick.codes/sick-2021-111 | Exploit Third Party Advisory |
| https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability | Third Party Advisory |
| https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md | Exploit Third Party Advisory |
| https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 | Patch Vendor Advisory |
| https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 | Vendor Advisory |
| https://sick.codes/sick-2021-111 | Exploit Third Party Advisory |
| https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-39246 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-39246 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Added Reference https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Added Reference https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Added Reference https://sick.codes/sick-2021-111 Added Reference https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Oct. 01, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Changed Reference Type https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md No Types Assigned https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Exploit, Third Party Advisory Changed Reference Type https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 No Types Assigned https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Patch, Vendor Advisory Changed Reference Type https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 No Types Assigned https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Vendor Advisory Changed Reference Type https://sick.codes/sick-2021-111 No Types Assigned https://sick.codes/sick-2021-111 Exploit, Third Party Advisory Changed Reference Type https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability No Types Assigned https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability Third Party Advisory Added CWE NIST CWE-532 Added CPE Configuration AND OR *cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:* versions up to (including) 10.5.6 *cpe:2.3:a:torproject:tor_browser:11.0:alpha2:*:*:*:*:*:* *cpe:2.3:a:torproject:tor_browser:11.0:alpha4:*:*:*:*:*:* OR cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Sep. 30, 2021
Action Type Old Value New Value Changed 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. If --log or --verbose is used, 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). 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).
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-39246 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-39246
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.26 }} 0.12%
score
0.64851
percentile