Alerts This Week
Warning Icon 1 714
Alerts This Week
Warning Icon 1 714

Red Hat 6: RHSA-2011:1819-01 Moderate DoS Issue in DHCP Packages

red hat
Calendar Grey December 14, 2011
Dist Redhat Esm H88
Newly released DHCP updates fixing a denial-of-service vulnerability are now accessible for Red Hat Enterprise Linux 6. Please upgrade promptly to enhance security.
Updated dhcp packages that fix one security issue are now available for Red Hat Enterprise Linux 6

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

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.

Topics%20covered

Topics Covered

security advisory moderate security update DoS Red Hat Enterprise Linux network management dhcp

References

https://access.redhat.com/security/cve/CVE-2011-4539 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

Read the Full Advisory


Advisory ID: RHSA-2011:1819-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:1819.html
Issue date: 2011-12-14

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.

Topics%20covered

Topics Covered

security advisory moderate security update DoS Red Hat Enterprise Linux network management dhcp

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here