Bug 2008652 (CVE-2021-39246)

Summary:	CVE-2021-39246 tor: allows a correlation attack excessive verbose logging
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	lewk, mh, msaulnier, pablo, paul.wouters, rh-bugzilla, s
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 05:30:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2008653
Bug Blocks:

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]