Bug 2008652 (CVE-2021-39246) - CVE-2021-39246 tor: allows a correlation attack excessive verbose logging
Summary: CVE-2021-39246 tor: allows a correlation attack excessive verbose logging
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-39246
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2008653
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-09-28 19:25 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-10-28 05:30 UTC (History)
7 users (show)

Fixed In Version:
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Last Closed: 2021-10-28 05:30:50 UTC
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Description Guilherme de Almeida Suckevicz 2021-09-28 19:25:34 UTC 
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).

References:
https://sick.codes/sick-2021-111
https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md

Upstream patch:
https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434
https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9
Comment 1 Guilherme de Almeida Suckevicz 2021-09-28 19:25:50 UTC 
Created tor tracking bugs for this issue:

Affects: epel-7 [bug 2008653]
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