RHBA-2014:1406 - Bug Fix Advisory

Topic

Updated dhcp packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

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.
The dhcp packages provide a relay agent and ISC DHCP service required to enable
and administer DHCP on a network.

This update fixes the following bugs:

• When a packet with checksum having the value of 0xffff was received by the

dhcpd daemon, the packet was discarded. With this update, checksum with value
0xffff is perceived as correct, and the packet is now processed as intended.
(BZ#1015997)

• Previously, the user could not run IPv6 version of the dhcrelay service,

because there was no such initiation script. To fix this bug, the initiation
script of dhcrelay has been added, and the user can now run service for IPv6
version of dhcrelay. (BZ#1053155)

• When IPv6 version of the dhcpd daemon served too many requests, the

/var/lib/dhcpd/dhcpd.leases file grew uncontrollably in size. As a consequence,
dhcpd refused to restart with the following error message:

file is too long to buffer

An upstream patch has been backported to fix this bug, and dhcpd for IPv6 now
rotates /var/lib/dhcpd/dhcpd.leases to prevent it from growing. (BZ#1053431)

• When using ISC DHCP server and clients on Infiniband cards (IPoIB), the

hardware address, called GUID, did not appear in logs. This update adds GUIDs to
the logs for IPoIB. (BZ#1064416)

• Every time the dhcpd daemon started, the ownership of the

/var/lib/dhcpd/dhcpd.leases file was changed from dhcpd:dhcpd to root:root. A
Fedora patch has been backported to fix this bug, and the ownership of
/var/lib/dhcpd/dhcpd.leases no longer changes. (BZ#1067142)

• When having failover configuration of the dhcpd daemon and using very long

lease times for clients, the following error was returned when starting dhcpd:

unable to write lease

A patch has been applied to fix this bug, and error messages no longer appear in
logs. (BZ#1099698)

• Previously, when starting the dhcpd daemon or the dhcrelay agent, the user

specified the name of the network interface. If longer than 15 characters, dhcpd
or dhcrelay terminated unexpectedly with the following error message:

• ** buffer overflow detected ***

A patch has been backported to fix this bug, and dhcpd or dhcrelay now exit
gracefully with a new error message informing the user that the interface name
is too long. (BZ#1102662)

Users of dhcp are advised to upgrade to these updated packages, which fix these
bugs.

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/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 1053155 - Missing init script for ipv6 version dhcrelay?
• BZ - 1053431 - dhcpd6.leases: file is too long to buffer
• BZ - 1067142 - Ownership of /var/lib/dhcpd/dhcpd.leases reverts to root:root on every dhcpd start
• BZ - 1102662 - dhcpd/dhcrelay segfault if interface name is longer than IFNAMSIZ

CVEs

(none)

References

(none)