(Gentoo Issues Fix) PowerDNS Authoritative Server Packet Loop Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1026733 |
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SecurityTracker URL: http://securitytracker.com/id/1026733
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CVE Reference:
CVE-2012-0206
(Links to External Site)
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Date: Feb 23 2012
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 3.0.1, except for 2.9.22.5 and 2.9.22.6
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Description:
A vulnerability was reported in PowerDNS Authoritative Server. A remote user can cause denial of service conditions.
A remote user can send specially crafted UDP packets to cause the target server to enter a packet loop, disrupting network service.
The vulnerability resides in 'pdns/common_startup.cc'.
Ray Morris of BetterCGI.com reported this vulnerability.
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Impact:
A remote user can disrupt network service.
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Solution:
Gentoo has issued a fix.
The Gentoo advisory is available at:
http://security.gentoo.org/glsa/glsa-201202-04.xml
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Vendor URL: doc.powerdns.com/powerdns-advisory-2012-01.html (Links to External Site)
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Cause:
State error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 23 Feb 2012 05:48:36 +0000
Subject: GLSA
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Gentoo Linux Security Advisory GLSA 201202-04
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http://security.gentoo.org/
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Severity: Normal
Title: PowerDNS: Denial of Service
Date: February 22, 2012
Bugs: #398403
ID: 201202-04
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Synopsis
========
A vulnerability in PowerDNS could allow a remote attacker to create a
Denial of Service condition.
Background
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The PowerDNS nameserver is an authoritative-only nameserver which uses
a flexible backend architecture.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/pdns < 3.0.1 >= 3.0.1
Description
===========
A vulnerability has been found in PowerDNS which could cause a packet
loop of DNS responses.
Impact
======
A remote attacker could send specially crafted DNS response packets,
possibly resulting in a Denial of Service condition.
Workaround
==========
PowerDNS users can set "cache-ttl=0" in /etc/powerdns/pdns.conf and
then restart the PowerDNS daemon:
# /etc/init.d/pdns restart
Please review the PowerDNS Security Advisory below for more workaround
details.
Resolution
==========
All PowerDNS users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/pdns-3.0.1"
References
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[ 1 ] CVE-2012-0206
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0206
[ 2 ] PowerDNS Security Advisory 2012-01
http://doc.powerdns.com/powerdns-advisory-2012-01.html
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-201202-04.xml
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@g.o or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
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Copyright 2012 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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