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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/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.

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