bugtraq - simple dns rebinding protection with dnsmasq

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Message-Id: <1193076306.4922.28.camel@panic>
Date: Mon, 22 Oct 2007 20:05:06 +0200
From: "Collin R. Mulliner" <collin@...aversion.net>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: simple dns rebinding protection with dnsmasq

dnsmasq (http://www.thekelleys.org.uk/dnsmasq/doc.html) a popular DHCP
and DNS forwarder and cache server used on many DSL/Cable routers now
has a simple DNS Rebinding protection mechanism. When executed with the
--stop-dns-rebind option the DNS resolver in dnsmasq will filter out
private IP addresses (127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8,
172.16.0.0/12 and 169.254.0.0/16). This should be sufficient for most
private/home users.

Feedback welcome.


dnsmasq:
http://www.thekelleys.org.uk/dnsmasq/doc.html


dnsmasq with dns rebinding protection:
http://www.thekelleys.org.uk/dnsmasq/test-releases/dnsmasq-2.41test11.tar.gz

orginal patch:  
http://www.mulliner.org/blog/blosxom.cgi/security/dnsmasq_dnsrebinding_protection_patch.html



Collin

--
Collin R. Mulliner <collin@...aversion.net>
BETAVERSiON Systems [www.betaversion.net]
info/pgp: finger collin@...aversion.net
weblog: http://www.mulliner.org/blog/
Tabs are for indentation space is for astronauts.