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List:       oss-security
Subject:    Re: [oss-security] CVE request for dnsmasq DoS
From:       Robert Buchholz <rbu () gentoo ! org>
Date:       2008-07-24 2:20:19
Message-ID: 200807240420.22187.rbu () gentoo ! org
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On Wednesday 23 July 2008, Josh Bressers wrote:
> On 8 July 2008, Jamie Strandboge wrote:
> > I finally had time to develop a PoC and confirm this on my own. A
> > client need only send a DHCPREQUEST for an IP address not on the
> > same network as dnsmasq. Eg:
> >
> > 1. dnsmasq listening on and giving IP addresses for
> > 192.168.122.0/24 2. client requests IP address on another network,
> > such as 192.168.0.1 3. dnsmasq 2.25 (and presumably earlier)
> > crashes
>
> It seems there is also a problem with newer dnsmasq that is very
> similar to this:
> http://bugs.gentoo.org/show_bug.cgi?id=232523
>
> That problem appears to be pretty much the same thing, but affecting
> versions 2.43 - 2.45

I could reproduce the issue using the dhcp_request.py Jamie sent 
earlier. The problem manifests the same way as the 2.25 flaw, but it 
only affects 2.43 -- 2.42 survives, and so does 2.44. However, that 
release has been withdrawn [1] because of another bug.

Hope that helps,
Robert

[1] http://www.thekelleys.org.uk/dnsmasq/dnsmasq-2.44-REMOVED.txt

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