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CVE Request -- dnsmasq: Incomplete fix for the CVE-2012-3411 issue
From: Jan Lieskovsky <jlieskov () redhat com>
Date: Fri, 18 Jan 2013 08:31:34 -0500 (EST)

Hello Kurt, Steve, vendors,

  the CVE-2012-3411 identifier has been originally assigned to the
following issue:

When dnsmasq is used in conjunctions with certain configurations of libvirtd, network packets from prohibited networks 
(e.g. packets that should not be passed in) may be sent to the dnsmasq application and processed. This can result in 
DNS amplification attacks for example.
[1] http://www.openwall.com/lists/oss-security/2012/07/12/5

Later it was found:
[2] https://bugzilla.redhat.com/show_bug.cgi?id=894486
[3] https://bugzilla.redhat.com/show_bug.cgi?id=894486#c3

the upstream patch for CVE-2012-3411 it not to be working properly,
as it still allowed (from [3]):

* replies to remote TCP-protocol based DNS queries
(UDP protocol ones were corrected, but TCP ones not)
from prohibited networks, when the --bind-dynamic option was used,

* when --except-interface lo option was used dnsmasq didn't
answer local or remote UDP DNS queries, but still allowed
TCP protocol based DNS queries,

* when --except-interface lo option was not used local / remote
TCP DNS queries were also still answered by dnsmasq.

Could you allocate a new CVE identifier for this? (as an
incomplete fix for CVE-2012-3411 issue)

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


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