From: Patrick McHardy <kaber@trash.net>
To: Stephen.Clark@seclark.us
Cc: netfilter-devel@lists.netfilter.org
Subject: Re: DNS rebinding
Date: Wed, 08 Aug 2007 16:14:16 +0200 [thread overview]
Message-ID: <46B9CFB8.80003@trash.net> (raw)
In-Reply-To: <46B8999F.3060202@seclark.us>
Stephen Clark wrote:
> Hello List,
>
> There is an article about DNS rebinding at the following site:
> http://crypto.stanford.edu/dns/
>
>
> "Circumvention-Resistant Firewalls. Firewalls can prevent
> their own circumvention by forbidding external host
> names from resolving to internal IP addresses, preventing
> the attacker from naming the target server, either by filtering
> packets [6] or by modifying their DNS resolver."
>
> Can netfilter be setup to keep dns responses from pointing to internal
> addresses by filtering the packets? If so how would one go about setting
> that up.
No, that would require a dns match. But IIRC someone posted something
like that based on nfnetlink_queue a couple of month ago ..
prev parent reply other threads:[~2007-08-08 14:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-07 16:11 DNS rebinding Stephen Clark
2007-08-08 14:14 ` Patrick McHardy [this message]
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