Bug 749839 (CVE-2011-2768, CVE-2011-2769)

Summary:	CVE-2011-2768 CVE-2011-2769 tor: multiple flaws corrected in 0.2.2.34
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	extras-orphan, lmacken, pwouters, rh-bugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-05-31 03:10:40 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:	749841, 749842
Bug Blocks:

Description Vincent Danen 2011-10-28 17:02:52 UTC

The Tor project has released 0.2.2.34 [1] which corrects the following flaws:

A design flaw in Tor could allow a malicious relay server to learn certain information that they should not be able to learn.  A malicious relay that a user connected to directly could learn which other relays that user is connected to directly.  Combining this with other attacks, this flaw could lead to de-anonymizing the user (CVE-2011-2768). [2],[3],[4]

In 0.2.2.34, bridges now refuse CREATE or CREATE_FAST cells on OR connections that they initiated.  Previously, relays could distinguish incoming bridge connections from client connections, creating another avenue for enumerating bridges (CVE-2011-2769). [5]

[1] https://blog.torproject.org/blog/tor-02234-released-security-patches
[2] https://gitweb.torproject.org/tor.git/commitdiff/638fdedcf16cf7d6f7c586d36f7ef335c1c9714f
[3] https://gitweb.torproject.org/tor.git/commitdiff/00fffbc1a15e2696a89c721d0c94dc333ff419ef
[4] https://gitweb.torproject.org/tor.git/commitdiff/4684ced1b3fced0543fa65bf01f75c5d81eaf464
[5] https://gitweb.torproject.org/tor.git/commitdiff/a74e7fd40f1a77eb4000d8216bb5b80cdd8a6193

(I may be slightly off on the git commits, particular for [3] and [4] which look like they are mitigation patches for dealing with unpatched clients; I believe that that [2] is the actual fix for CVE-2011-2768).

Comment 1 Vincent Danen 2011-10-28 17:13:32 UTC

Created tor tracking bugs for this issue

Affects: epel-5 [bug 749841]
Affects: fedora-all [bug 749842]

Comment 2 Fedora Update System 2011-11-04 20:27:30 UTC

tor-0.2.1.31-1500.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2011-11-10 17:25:36 UTC

tor-0.2.2.34-1600.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Paul Wouters 2013-05-31 03:10:40 UTC

all branches were upgraded a long time ago