Synopsis

dhcp bug fix and enhancement update

Type/Severity

Bug Fix Advisory

Topic

Updated dhcp packages that fix several bugs and add two enhancements 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.
DHCPv6 is the DHCP protocol that supports IPv6 networks.

This update fixes the following bugs:

• Previously, when multiple DHCP clients were launched at the same time to
  handle multiple virtual interfaces on the same network interface card (NIC), the
  clients used the same seed to choose when to renew their leases. Consequently,
  these virtual interfaces for some clients could have been removed over time.
  With this update, the dhclient utility uses the Process Identifier (PID) for
  seeding the random number generator, which fixes the bug. (BZ#694798)
  
• If a system was rebooted while a network switch was inoperative, the network
  connection would recover successfully. However, it was no longer configured to
  use DHCP even if the dhclient utility had been running in persistent mode. With
  this update, the dhclient-script file has been modified to refresh the ARP
  (Address Resolution Protocol) table and the routing table instead of bringing
  the interface down, which fixes the bug. (BZ#694799)
  
• If the system included network interfaces with no hardware address, the dhcpd
  scan could have experienced a segmentation fault when scanning such an
  interface. As a consequence, the dhcpd daemon unexpectedly terminated. To
  prevent this issue, dhcpd now tests a pointer which represents the hardware
  address of the interface for the NULL value. The dhcp daemon no longer crashes.
  (BZ#731990)
  
• Previously, all source files were compiled with the "-fpie" or "fPIE" flag. As
  a consequence, the libraries used by dhcp could not have been used to build Perl
  modules. To fix this problem, all respective dhcp Makefiles have been modified
  to compile libraries with the "-fpic" or "-fPIC" flag. The libraries used by
  dhcp are now built without the previous restrictions. (BZ#736999)
  
• Previously, both dhcp and dhclient packages included the dhcp-options(5) and
  dhcp-eval(5) man pages. As a consequence, a conflict could have occurred when
  any of these man pages were updated, because dhcp and dhclient packages could
  have been upgraded separately. To prevent the problem from occurring in future
  updates, shared files of dhcp and dhclient packages have been moved to the
  dhcp-common package that is required by both dhcp and dhclient as a dependency.
  (BZ#736194)
  

This update also provides the following enhancements:

• A feature has been backported from dhcp version 4.2.0. This feature allows the
  DHCPv6 server to be configured to identify DHCPv6 clients in accordance with
  their link-layer address and their network hardware type. With this update, it
  is now possible to define a static IPv6 address for the DHCPv6 client with a
  known link-layer address. (BZ#706974)
  
• Previously, the dhcpd daemon ran as root. With this update, new "-user" and
  "-group" options can be used with dhcpd. These options allow dhcpd to change the
  effective user and group ID after it starts. The dhcpd and dhcpd6 services now
  run the dhcpd daemon with the "-user dhcpd -group dhcpd" parameters, which means
  that the dhcpd daemon runs as the dhcpd user and group instead root. (BZ#693381)
  

Users are advised to upgrade to these updated dhcp packages, which fixes these
bugs and add these enhancements.

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

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• 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

Fixes

• BZ - 693381 - dhcpd running as root
• BZ - 694798 - Multiple dhclients can steal each others' DHCPOFFERs
• BZ - 694799 - No IP connectivity with DHCP when Link was down on boot
• BZ - 731990 - dhcpd can segfault when scanning TUN interface during start
• BZ - 736194 - Upgrading dhcp, dhclient separately causes rpm file conflicts
• BZ - 736999 - dhcp's libdhcpctl libdst libomapi libraries need rebuilding with -fPIC

CVEs

(none)

References

(none)

Red Hat Enterprise Linux Server 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
x86_64
dhclient-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 39f699ab364795ab93bd17aad253b378329c2e0b2e24616bc5748d2d1715c9c8
dhcp-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: f8d90221beb995ea646db0dc4040c1d9e5edb4ccb1c5ff8f88ef215d00640b13
dhcp-common-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: a23dd9e201b348038fb788081f5da0c1294b7d96c2c078a0bc261f3721faaaac
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75
dhcp-devel-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: e89ea66d898bc2166a9da7aadea87e43b97719b98a6b194f91d320ab3630be93
i386
dhclient-4.1.1-25.P1.el6.i686.rpm	SHA-256: 9c906d6061636be74f6eca227efb39da2915efb3f5f1e4c2344f2f46b2fce09b
dhcp-4.1.1-25.P1.el6.i686.rpm	SHA-256: fc129d1c8ae5e7dc070c6393b0a0b991ad67cdc6a8cade9602faf8fb8adf5a82
dhcp-common-4.1.1-25.P1.el6.i686.rpm	SHA-256: 50df7697867a62c944a4fdb8d34ffabdff181112ad7642a6054d31a1262f959c
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75

Red Hat Enterprise Linux Workstation 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
x86_64
dhclient-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 39f699ab364795ab93bd17aad253b378329c2e0b2e24616bc5748d2d1715c9c8
dhcp-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: f8d90221beb995ea646db0dc4040c1d9e5edb4ccb1c5ff8f88ef215d00640b13
dhcp-common-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: a23dd9e201b348038fb788081f5da0c1294b7d96c2c078a0bc261f3721faaaac
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75
dhcp-devel-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: e89ea66d898bc2166a9da7aadea87e43b97719b98a6b194f91d320ab3630be93
i386
dhclient-4.1.1-25.P1.el6.i686.rpm	SHA-256: 9c906d6061636be74f6eca227efb39da2915efb3f5f1e4c2344f2f46b2fce09b
dhcp-4.1.1-25.P1.el6.i686.rpm	SHA-256: fc129d1c8ae5e7dc070c6393b0a0b991ad67cdc6a8cade9602faf8fb8adf5a82
dhcp-common-4.1.1-25.P1.el6.i686.rpm	SHA-256: 50df7697867a62c944a4fdb8d34ffabdff181112ad7642a6054d31a1262f959c
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75

Red Hat Enterprise Linux Desktop 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
x86_64
dhclient-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 39f699ab364795ab93bd17aad253b378329c2e0b2e24616bc5748d2d1715c9c8
dhcp-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: f8d90221beb995ea646db0dc4040c1d9e5edb4ccb1c5ff8f88ef215d00640b13
dhcp-common-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: a23dd9e201b348038fb788081f5da0c1294b7d96c2c078a0bc261f3721faaaac
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75
dhcp-devel-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: e89ea66d898bc2166a9da7aadea87e43b97719b98a6b194f91d320ab3630be93
i386
dhclient-4.1.1-25.P1.el6.i686.rpm	SHA-256: 9c906d6061636be74f6eca227efb39da2915efb3f5f1e4c2344f2f46b2fce09b
dhcp-4.1.1-25.P1.el6.i686.rpm	SHA-256: fc129d1c8ae5e7dc070c6393b0a0b991ad67cdc6a8cade9602faf8fb8adf5a82
dhcp-common-4.1.1-25.P1.el6.i686.rpm	SHA-256: 50df7697867a62c944a4fdb8d34ffabdff181112ad7642a6054d31a1262f959c
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75

Red Hat Enterprise Linux for IBM z Systems 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
s390x
dhclient-4.1.1-25.P1.el6.s390x.rpm	SHA-256: b17023ea4122dc11710545ee4e6869d634f658806846ead77233f5bafdfc3154
dhcp-4.1.1-25.P1.el6.s390x.rpm	SHA-256: 139bb0a3daa4291b2ae650022eeb37a3a3eaaf75e43abad4b643ab98ce54adf1
dhcp-common-4.1.1-25.P1.el6.s390x.rpm	SHA-256: 647672a6033fe0fcdbb76682103c76a1897f9012b9690d9e145b5d5af205796c
dhcp-debuginfo-4.1.1-25.P1.el6.s390.rpm	SHA-256: bae0dadf5a5f580a7e86eab188b47f7e90dbf75320dc9b61dd599fdf39a52144
dhcp-debuginfo-4.1.1-25.P1.el6.s390x.rpm	SHA-256: 6e3914ad5c75c3c76c62c5f67d0197b7d71bef17027539961778a1cb89691680
dhcp-debuginfo-4.1.1-25.P1.el6.s390x.rpm	SHA-256: 6e3914ad5c75c3c76c62c5f67d0197b7d71bef17027539961778a1cb89691680
dhcp-devel-4.1.1-25.P1.el6.s390.rpm	SHA-256: 5f30b9f2849a45025fdf15957e7680b3adba4643395ac1d815deee28082f16f4
dhcp-devel-4.1.1-25.P1.el6.s390x.rpm	SHA-256: 58938407ec97d013ac0c9983f7a27eb2938c5962a2fae37ffe90e8717c996a22

Red Hat Enterprise Linux for Power, big endian 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
ppc64
dhclient-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: 97e09e113360540ee0308d9b9405c5e0e2e5dc452b63fa12fd921008cec32a14
dhcp-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: db22510fde855d34da12ed01531bf77e17f1a434bbceae96400da54f3b51afa1
dhcp-common-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: b601bca248247f23512e0c720166a835c4f97a088adc1c40f3676ba9d7a95f23
dhcp-debuginfo-4.1.1-25.P1.el6.ppc.rpm	SHA-256: ce015c64af4203cfc8c067a732796b63817eeb5234ac59b2d1100f5e5b5e2b0a
dhcp-debuginfo-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: 99d728aa8617f6725b2c684768a3223be98393e1c831d1a84b1afc5a290a7500
dhcp-debuginfo-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: 99d728aa8617f6725b2c684768a3223be98393e1c831d1a84b1afc5a290a7500
dhcp-devel-4.1.1-25.P1.el6.ppc.rpm	SHA-256: 629aa0cceb75a4116014cd9f5547dba6e2181c16935dfab9d703de8893046a3b
dhcp-devel-4.1.1-25.P1.el6.ppc64.rpm	SHA-256: d3f25d53081bdccab5ebe7cd62ffc7bd907d15f94304c2a59edb1d3688d787eb

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
x86_64
dhclient-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 39f699ab364795ab93bd17aad253b378329c2e0b2e24616bc5748d2d1715c9c8
dhcp-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: f8d90221beb995ea646db0dc4040c1d9e5edb4ccb1c5ff8f88ef215d00640b13
dhcp-common-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: a23dd9e201b348038fb788081f5da0c1294b7d96c2c078a0bc261f3721faaaac
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75
dhcp-devel-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: e89ea66d898bc2166a9da7aadea87e43b97719b98a6b194f91d320ab3630be93

Red Hat Enterprise Linux Server from RHUI 6

SRPM
dhcp-4.1.1-25.P1.el6.src.rpm	SHA-256: 381a368b8d9d487b23645b1ab5609f5b4b2ba9fbb57242b740a6cfad3132369d
x86_64
dhclient-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 39f699ab364795ab93bd17aad253b378329c2e0b2e24616bc5748d2d1715c9c8
dhcp-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: f8d90221beb995ea646db0dc4040c1d9e5edb4ccb1c5ff8f88ef215d00640b13
dhcp-common-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: a23dd9e201b348038fb788081f5da0c1294b7d96c2c078a0bc261f3721faaaac
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-debuginfo-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: 823bc6459798572f213b09ec05d06f56ea23e3251577bb0be6635a98777dda89
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75
dhcp-devel-4.1.1-25.P1.el6.x86_64.rpm	SHA-256: e89ea66d898bc2166a9da7aadea87e43b97719b98a6b194f91d320ab3630be93
i386
dhclient-4.1.1-25.P1.el6.i686.rpm	SHA-256: 9c906d6061636be74f6eca227efb39da2915efb3f5f1e4c2344f2f46b2fce09b
dhcp-4.1.1-25.P1.el6.i686.rpm	SHA-256: fc129d1c8ae5e7dc070c6393b0a0b991ad67cdc6a8cade9602faf8fb8adf5a82
dhcp-common-4.1.1-25.P1.el6.i686.rpm	SHA-256: 50df7697867a62c944a4fdb8d34ffabdff181112ad7642a6054d31a1262f959c
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-debuginfo-4.1.1-25.P1.el6.i686.rpm	SHA-256: fd404a4cea41add644347ee40640895359ec454df4de34d50ba598d27769d8ec
dhcp-devel-4.1.1-25.P1.el6.i686.rpm	SHA-256: 3692009dc0a8fe50b59ef4412998979ee80b44b78f8a649b38237fc8a1ca2a75