Bug 1467727 (CVE-2017-0377)

Summary:	CVE-2017-0377 tor: improper implementation of guard-selection algorithm could weaken anonymity
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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+fedora, mh, pwouters, 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:	2017-09-20 11:36:40 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:	1467728, 1467729
Bug Blocks:

Description Pedro Sampaio 2017-07-04 21:39:29 UTC

Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only
considers the exit relay (not the exit relay's family), which might
allow remote attackers to defeat intended anonymity properties by
leveraging the existence of large families.

Upstream bug:

https://trac.torproject.org/projects/tor/ticket/22753

Upstream patch:

https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350

References:

https://blog.torproject.org/blog/tor-0309-released-security-update-clients

Comment 1 Pedro Sampaio 2017-07-04 21:39:52 UTC

Created tor tracking bugs for this issue:

Affects: epel-all [bug 1467728]
Affects: fedora-all [bug 1467729]

Comment 2 Marcel Haerry 2017-07-26 09:10:26 UTC

Only 0.3.0.x or 0.3.1.x versions were affected by this CVE. Fedora nor EPEL currently ship a Version > 0.2.9.10, which means nobody was affected and this could be closed.