Date: Thu, 24 Jul 2008 04:20:19 +0200 From: Robert Buchholz <rbu@...too.org> To: oss-security@...ts.openwall.com Cc: Josh Bressers <bressers@...hat.com>, Jamie Strandboge <jamie@...onical.com>, "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request for dnsmasq DoS 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 However, that release has been withdrawn  because of another bug. Hope that helps, Robert  http://www.thekelleys.org.uk/dnsmasq/dnsmasq-2.44-REMOVED.txt Download attachment "signature.asc " of type "application/pgp-signature" (836 bytes)
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