Issued:

2011-08-15

Updated:

2011-08-15

RHSA-2011:1160 - Moderate: dhcp security update

Synopsis

Moderate: dhcp security update

Type/Severity

Security Advisory Moderate

Topic

Updated dhcp packages that fix two security issues are now available for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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.

Two denial of service flaws were found in the way the dhcpd daemon handled certain incomplete request packets. A remote attacker could use these flaws to crash dhcpd via a specially-crafted request. (CVE-2011-2748, CVE-2011-2749)

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

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 This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

Updated Packages

• dhcp-3.0.5-29.el5_7.1.x86_64.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.x86_64.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.ppc64.rpm
• dhcp-devel-3.0.1-68.el4.s390.rpm
• dhclient-3.0.1-68.el4.ia64.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.x86_64.rpm
• dhcp-4.1.1-19.P1.el6_1.1.ppc64.rpm
• dhclient-3.0.5-29.el5_7.1.i386.rpm
• dhclient-3.0.5-29.el5_7.1.s390x.rpm
• dhcp-3.0.1-68.el4.src.rpm
• dhclient-3.0.1-68.el4.x86_64.rpm
• dhcp-devel-3.0.5-29.el5_7.1.s390x.rpm
• dhcp-devel-3.0.5-29.el5_7.1.ppc64.rpm
• dhcp-3.0.5-29.el5_7.1.i386.rpm
• dhcp-devel-3.0.1-68.el4.ppc.rpm
• dhclient-4.1.1-19.P1.el6_1.1.s390x.rpm
• libdhcp4client-3.0.5-29.el5_7.1.i386.rpm
• dhcp-4.1.1-19.P1.el6_1.1.x86_64.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.s390x.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.ppc.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.ppc.rpm
• dhclient-3.0.1-68.el4.i386.rpm
• dhcp-3.0.1-68.el4.ia64.rpm
• libdhcp4client-3.0.5-29.el5_7.1.x86_64.rpm
• dhcp-devel-3.0.5-29.el5_7.1.ppc.rpm
• dhcp-3.0.5-29.el5_7.1.ppc.rpm
• dhcp-4.1.1-19.P1.el6_1.1.src.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.s390.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.ppc64.rpm
• dhclient-4.1.1-19.P1.el6_1.1.ppc64.rpm
• dhcp-3.0.1-68.el4.s390.rpm
• dhcp-4.1.1-19.P1.el6_1.1.i686.rpm
• dhcp-3.0.1-68.el4.i386.rpm
• dhclient-3.0.1-68.el4.s390.rpm
• libdhcp4client-3.0.5-29.el5_7.1.s390.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.s390x.rpm
• libdhcp4client-3.0.5-29.el5_7.1.ppc.rpm
• dhclient-3.0.5-29.el5_7.1.ppc.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.i686.rpm
• dhcp-3.0.5-29.el5_7.1.s390x.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.ia64.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.s390.rpm
• dhcp-3.0.1-68.el4.ppc.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.i686.rpm
• dhcp-devel-3.0.5-29.el5_7.1.ia64.rpm
• libdhcp4client-3.0.5-29.el5_7.1.ppc64.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.ppc64.rpm
• dhcp-devel-3.0.1-68.el4.ia64.rpm
• dhclient-4.1.1-19.P1.el6_1.1.x86_64.rpm
• dhclient-3.0.5-29.el5_7.1.x86_64.rpm
• dhclient-3.0.5-29.el5_7.1.ia64.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.s390.rpm
• dhcp-3.0.5-29.el5_7.1.src.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.s390x.rpm
• dhcp-4.1.1-19.P1.el6_1.1.s390x.rpm
• dhcp-debuginfo-4.1.1-19.P1.el6_1.1.x86_64.rpm
• dhcp-devel-3.0.1-68.el4.s390x.rpm
• dhcp-devel-3.0.5-29.el5_7.1.x86_64.rpm
• libdhcp4client-3.0.5-29.el5_7.1.ia64.rpm
• dhcp-devel-3.0.1-68.el4.i386.rpm
• dhclient-3.0.1-68.el4.ppc.rpm
• dhclient-3.0.1-68.el4.s390x.rpm
• libdhcp4client-devel-3.0.5-29.el5_7.1.i386.rpm
• dhcp-devel-3.0.5-29.el5_7.1.i386.rpm
• dhcp-3.0.1-68.el4.x86_64.rpm
• dhcp-3.0.1-68.el4.s390x.rpm
• dhcp-devel-3.0.1-68.el4.x86_64.rpm
• libdhcp4client-3.0.5-29.el5_7.1.s390x.rpm
• dhcp-devel-4.1.1-19.P1.el6_1.1.ppc.rpm
• dhcp-devel-3.0.5-29.el5_7.1.s390.rpm
• dhclient-4.1.1-19.P1.el6_1.1.i686.rpm
• dhcp-3.0.5-29.el5_7.1.ia64.rpm

Fixes

• This content is not included.BZ - 729382

CVEs

• CVE-2011-2748
• CVE-2011-2749

References

• https://access.redhat.com/security/updates/classification/#moderate

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.