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Red Hat: RHSA-2011:0256-01 Moderate: dhcp Security Issue

red hat
Calendar Grey February 15, 2011
Dist Redhat Esm H88
Recent security patch for Red Hat's dns package tackles significant vulnerability impacting DNS server operations.
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

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. DHCPv6 is the DHCP protocol version for IPv6 networks.
A flaw was found in the way the dhcpd daemon processed certain DHCPv6 messages for addresses that had previously been declined and marked as abandoned internally. If a remote attacker sent such messages to dhcpd, it could cause dhcpd to crash due to an assertion failure if it was running as a DHCPv6 server. (CVE-2011-0413)
Red Hat would like to thank Internet Systems Consortium for reporting this issue.
Users running dhcpd as a DHCPv6 server 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 issue update Red Hat Enterprise Linux network configuration dhcp

References

https://access.redhat.com/security/cve/CVE-2011-0413 https://access.redhat.com/security/updates/classification#moderate https://kb.isc.org/docs/aa-00456

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: dhclient-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.i686.rpm
x86_64: dhclient-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: dhcp-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-devel-4.1.1-12.P1.el6_0.2.i686.rpm
x86_64: dhcp-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-devel-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-devel-4.1.1-12.P1.el6_0.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: dhclient-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
x86_64: dhcp-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.x86_64.rpm dhcp-devel-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-devel-4.1.1-12.P1.el6_0.2.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
i386: dhclient-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-4.1.1-12.P1.el6_0.2.i686.rpm dhcp-debuginfo-4.1.1-12.P1.el6_0.2.i686.rpm
ppc64: dhclient-4.1.1-12.P1.el6_0.2.ppc64.rpm dhcp-4.1.1-12.P1.el6_0.2.ppc64.rpm

Read the Full Advisory


Advisory ID: RHSA-2011:0256-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0256.html
Issue date: 2011-02-15

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 issue update Red Hat Enterprise Linux network configuration 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

672755 - CVE-2011-0413 dhcp: unexpected abort caused by a DHCPv6 decline message

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