RedHat: RHSA-2011-1819:01 Moderate: dhcp security update
Summary
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.
Summary
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/kb/docs/DOC-11259
References
https://www.redhat.com/security/data/cve/CVE-2011-4539.html https://access.redhat.com/security/updates/classification/#moderate https://kb.isc.org/docs/aa-00569
Package List
Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386:
dhclient-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
x86_64:
dhclient-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.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386:
dhcp-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:
dhcp-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
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64:
dhclient-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.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
x86_64:
dhcp-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
Red Hat Enterprise Linux Server (v. 6):
Source:
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
ppc64:
dhclient-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm
s390x:
dhclient-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.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.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
Source:
i386:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
ppc64:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.ppc.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.ppc64.rpm
s390x:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.s390.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.s390x.rpm
x86_64:
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
Red Hat Enterprise Linux Workstation (v. 6):
Source:
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
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.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
Source:
i386:
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:
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
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
Topic
Updated dhcp packages that fix one security issue are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Bugs Fixed
761265 - CVE-2011-4539 dhcp: DoS due to processing certain regular expressions