Issued:
2012-08-03
Updated:
2012-08-03

RHSA-2012:1140 - Moderate: dhcp security update

Synopsis

Moderate: dhcp security update

Type/Severity

Security Advisory Moderate

Topic

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.

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.

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

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Power, big endian5ppc
Red Hat Enterprise Linux for IBM z Systems5s390x
Red Hat Enterprise Linux Workstation5x86_64
Red Hat Enterprise Linux Workstation5i386
Red Hat Enterprise Linux Server5x86_64
Red Hat Enterprise Linux Server5ia64
Red Hat Enterprise Linux Server5i386
Red Hat Enterprise Linux Server from RHUI5x86_64
Red Hat Enterprise Linux Server from RHUI5i386
Red Hat Enterprise Linux Desktop5x86_64
Red Hat Enterprise Linux Desktop5i386

Updated Packages

  • libdhcp4client-3.0.5-31.el5_8.1.s390.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
  • dhcp-3.0.5-31.el5_8.1.src.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.ia64.rpm
  • dhclient-3.0.5-31.el5_8.1.ppc.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.s390.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
  • dhcp-3.0.5-31.el5_8.1.ia64.rpm
  • dhcp-3.0.5-31.el5_8.1.i386.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.ppc.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.s390x.rpm
  • dhclient-3.0.5-31.el5_8.1.x86_64.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.s390.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.s390x.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.ppc64.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.ppc.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.s390x.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.s390x.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.ppc.rpm
  • dhclient-3.0.5-31.el5_8.1.s390x.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
  • dhcp-3.0.5-31.el5_8.1.x86_64.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.ppc.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
  • dhclient-3.0.5-31.el5_8.1.i386.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm
  • dhclient-3.0.5-31.el5_8.1.ia64.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.ia64.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.ia64.rpm
  • dhcp-3.0.5-31.el5_8.1.s390x.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.ppc64.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.ia64.rpm
  • libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
  • dhcp-devel-3.0.5-31.el5_8.1.s390.rpm
  • libdhcp4client-devel-3.0.5-31.el5_8.1.ppc64.rpm
  • dhcp-debuginfo-3.0.5-31.el5_8.1.ppc64.rpm
  • dhcp-3.0.5-31.el5_8.1.ppc.rpm

Fixes

CVEs

References

Additional information