oss-security - CVE Request -- dhcp: DoS (excessive CPU use) by opening an OMAPI connection

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Date: Wed, 06 Apr 2011 19:09:55 +0200
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security <oss-security@...ts.openwall.com>,
        Jiri Popelka <jpopelka@...hat.com>
Subject: CVE Request -- dhcp: DoS (excessive CPU use) by opening an OMAPI
 connection

Hello Josh, Steve, vendors,

   A security flaw was found in the way DHCP (Dynamic Host Configuration Protocol)
server processed remote connections when the dhcpd was configured to provide
Object Management API (OMAPI) capability. A remote attacker could use this flaw
to cause denial of service (excessive CPU use and dhcpd daemon unreachability).

References:
[1] https://bugzilla.novell.com/show_bug.cgi?id=680298
[2] https://lists.isc.org/pipermail/dhcp-users/2011-February/012780.html
[3] https://lists.isc.org/pipermail/dhcp-users/2011-February/012781.html
[4] https://bugzilla.redhat.com/show_bug.cgi?id=666441
[5] http://www.mentby.com/Group/dhcp-users/omapi-not-working-in-420.html

Note: Though looks as minor / low severity issue, under proper configuration
       looks to be a way, how to get dhcpd completely unresponsive for further
       requests.

Could you allocate a CVE id for this? (though opened for discussion if this
being more to be a bug, than a real security issue).

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

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