Scientific Linux: CVE-2012-3571 Moderate Risk of dhcp DoS and Memory Leak

Date: Fri, 3 Aug 2012 08:32:07 -0500
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Sender: Security Errata for Scientific Linux
 
From: Patrick Riehecky 
Subject: Security ERRATA Moderate: dhcp on SL6.x i386/x86_64
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Synopsis: Moderate: dhcp security update
Issue Date: 2012-08-03
CVE Numbers: CVE-2012-3571
 CVE-2012-3954

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
zero-length client identifiers. A remote attacker could use this flaw to
send a specially-crafted request to dhcpd, possibly causing it to enter an
infinite loop and consume an excessive amount of CPU time. (CVE-2012-3571)

Two memory leak flaws were found in the dhcpd daemon. A remote attacker
could use these flaws to cause dhcpd to exhaust all available memory by
sending a large number of DHCP requests. (CVE-2012-3954)

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

SL6:
 i386
 dhclient-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-common-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
 x86_64
 dhclient-4.1.1-31.P1.el6_3.1.x86_64.rpm
 dhcp-4.1.1-31.P1.el6_3.1.x86_64.rpm
 dhcp-common-4.1.1-31.P1.el6_3.1.x86_64.rpm
 dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
 dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
 dhcp-devel-4.1.1-31.P1.el6_3.1.x86_64.rpm

- Scientific Linux Development Team