Scientific Linux: 2011-12-14 Moderate: DHCP Denial of Service Threat

Date: Thu, 15 Dec 2011 15:24:47 -0600
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Sender: Security Errata for Scientific Linux
 
From: Pat Riehecky 
Subject: Security ERRATA Moderate: dhcp on SL6.x i386/x86_64
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Synopsis: Moderate: dhcp security update
Issue Date: 2011-12-14
CVE Numbers: CVE-2011-4539

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
individual devices on an IP network to get their own network configuration
information, including an IP address, a subnet mask, and a broadcast
address.

A denial of service flaw was found in the way the dhcpd daemon handled DHCP
request packets when regular expression matching was used in
"/etc/dhcp/dhcpd.conf". A remote attacker could use this flaw to crash
dhcpd. (CVE-2011-4539)

Users of DHCP should upgrade to these updated packages, which contain a
backported patch to correct this issue. After installing this update, all
DHCP servers will be restarted automatically.

SL6:
 i386
 dhclient-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
 x86_64
 dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm
 dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
 dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm
 dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
 dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
 dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm

- Scientific Linux Development Team