Articles / Red Hat: Security update fo…

Red Hat: Security update for DHCP

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. Updated packages are available from ftp.redhat.com.

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=====================================================================
                  Red Hat Security Advisory

Synopsis:          Moderate: dhcp security update
Advisory ID:       RHSA-2012:1140-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1140.html
Issue date:        2012-08-03
CVE Names:         CVE-2012-3571 
=====================================================================

1. Summary:

Updated dhcp packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

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)

Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as
the original reporter of this issue.

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.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

842420 - CVE-2012-3571 dhcp: DoS due to error in handling malformed client identifiers

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm

i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm

x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm

i386:
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm

x86_64:
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm

i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm

ia64:
dhclient-3.0.5-31.el5_8.1.ia64.rpm
dhcp-3.0.5-31.el5_8.1.ia64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ia64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ia64.rpm

ppc:
dhclient-3.0.5-31.el5_8.1.ppc.rpm
dhcp-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc64.rpm

s390x:
dhclient-3.0.5-31.el5_8.1.s390x.rpm
dhcp-3.0.5-31.el5_8.1.s390x.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390x.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390x.rpm

x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-3571.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.isc.org/software/dhcp/advisories/cve-2012-3571

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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