oss-security - CVE Request -- dnsmasq: When being run by libvirt open DNS proxy (reachable out-of the virtual network set for the particular guest domain too) is created

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Date: Mon, 09 Jul 2012 14:04:35 +0200
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security@...ts.openwall.com, David Woodhouse <dwmw2@...radead.org>,
        Daniel Berrange <berrange@...hat.com>,
        Daniel Veillard <veillard@...hat.com>
Subject: CVE Request -- dnsmasq: When being run by libvirt open DNS proxy
 (reachable out-of the virtual network set for the particular guest domain
 too) is created

Hello Kurt, Steve, vendors,

   David Woodhouse reported a deficiency in the way dnsmasq,
a lightweight, easy to configure DNS forwarder and DHCP server,
when being run under libvirt, a library providing simple
virtualization API, performed processing of packets coming
outside of virtual network set for the particular guest domain.

   When libvirt was configured to provide a range of public
IP addresses to its guest domains and dnsmasq was instructed
to discard packets originating from other interfaces, than
specified on the command line via the --bind-interface option,
those packets (coming from 'prohibited' interfaces) were not
dropped properly and subsequently processed.

   A remote attacker could use this flaw to cause a distributed
denial of service, as demonstrated in the report [1] via "stream
of spoofed DNS queries producing large results".

References:
[1] https://bugzilla.redhat.com/show_bug.cgi?id=833033

Could you allocate a CVE id for this?

Thank you && Regards, Jan.
--
Jan iankko Lieskovsky / Red Hat Security Response Team

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