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[gentoo-announce] [ GLSA 201507-02 ] Tor: Denial of Service

Posted on 06 July 2015
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 201507-02
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https://security.gentoo.org/
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Severity: Normal
Title: Tor: Denial of Service
Date: July 06, 2015
Bugs: #545940
ID: 201507-02

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Synopsis
========
Two vulnerabilities have been found in Tor, the worst of which can
allow remote attackers to cause a Denial of Service condition.

Background
==========
Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/tor < 0.2.6.7 >= 0.2.6.7

Description
===========
Tor does not handle data correctly when specifically crafted data is
sent, and also fails to properly verify a descriptor provided by a
hidden service directory.

Impact
======
A remote attacker could cause a Denial of Service condition in both a
Tor client or a Tor server.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All Tor users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.6.7"

References
==========
[ 1 ] CVE-2015-2928
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-2928
[ 2 ] CVE-2015-2929
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-2929
[ 3 ] Upstream announcement
https://blog.torproject.org/blog/tor-02512-and-0267-are-released

Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/201507-02

Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======
Copyright 2015 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5



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