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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: dhcp security update
Advisory ID:       RHSA-2018:0158-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0158
Issue date:        2018-01-25
CVE Names:         CVE-2017-3144 
=====================================================================

1. Summary:

An update for dhcp is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) -
 aarch64, ppc64le
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v.
 7) - aarch64, ppc64le

3. 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.

Security Fix(es):

* It was found that the DHCP daemon did not properly clean up closed OMAPI
connections in certain cases. A remote attacker able to connect to the
OMAPI port could use this flaw to exhaust file descriptors in the DHCP
daemon, leading to a denial of service in the OMAPI functionality.
(CVE-2017-3144)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1522918 - CVE-2017-3144 dhcp: omapi code doesn't free socket descriptors
 when empty message is received allowing denial-of-service

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
dhcp-4.2.5-58.el7_4.1.src.rpm

x86_64:
dhclient-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-common-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-libs-4.2.5-58.el7_4.1.i686.rpm
dhcp-libs-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
dhcp-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-devel-4.2.5-58.el7_4.1.i686.rpm
dhcp-devel-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
dhcp-4.2.5-58.el7_4.1.src.rpm

x86_64:
dhclient-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-common-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-libs-4.2.5-58.el7_4.1.i686.rpm
dhcp-libs-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
dhcp-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-devel-4.2.5-58.el7_4.1.i686.rpm
dhcp-devel-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
dhcp-4.2.5-58.el7_4.1.src.rpm

ppc64:
dhclient-4.2.5-58.el7_4.1.ppc64.rpm
dhcp-4.2.5-58.el7_4.1.ppc64.rpm
dhcp-common-4.2.5-58.el7_4.1.ppc64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64.rpm
dhcp-libs-4.2.5-58.el7_4.1.ppc.rpm
dhcp-libs-4.2.5-58.el7_4.1.ppc64.rpm

ppc64le:
dhclient-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-common-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-libs-4.2.5-58.el7_4.1.ppc64le.rpm

s390x:
dhclient-4.2.5-58.el7_4.1.s390x.rpm
dhcp-4.2.5-58.el7_4.1.s390x.rpm
dhcp-common-4.2.5-58.el7_4.1.s390x.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.s390.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.s390x.rpm
dhcp-libs-4.2.5-58.el7_4.1.s390.rpm
dhcp-libs-4.2.5-58.el7_4.1.s390x.rpm

x86_64:
dhclient-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-common-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-libs-4.2.5-58.el7_4.1.i686.rpm
dhcp-libs-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
dhcp-4.2.5-58.el7_4.1.src.rpm

aarch64:
dhclient-4.2.5-58.el7_4.1.aarch64.rpm
dhcp-4.2.5-58.el7_4.1.aarch64.rpm
dhcp-common-4.2.5-58.el7_4.1.aarch64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.aarch64.rpm
dhcp-libs-4.2.5-58.el7_4.1.aarch64.rpm

ppc64le:
dhclient-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-common-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-libs-4.2.5-58.el7_4.1.ppc64le.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64.rpm
dhcp-devel-4.2.5-58.el7_4.1.ppc.rpm
dhcp-devel-4.2.5-58.el7_4.1.ppc64.rpm

ppc64le:
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-devel-4.2.5-58.el7_4.1.ppc64le.rpm

s390x:
dhcp-debuginfo-4.2.5-58.el7_4.1.s390.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.s390x.rpm
dhcp-devel-4.2.5-58.el7_4.1.s390.rpm
dhcp-devel-4.2.5-58.el7_4.1.s390x.rpm

x86_64:
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-devel-4.2.5-58.el7_4.1.i686.rpm
dhcp-devel-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v.
 7):

aarch64:
dhcp-debuginfo-4.2.5-58.el7_4.1.aarch64.rpm
dhcp-devel-4.2.5-58.el7_4.1.aarch64.rpm

ppc64le:
dhcp-debuginfo-4.2.5-58.el7_4.1.ppc64le.rpm
dhcp-devel-4.2.5-58.el7_4.1.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
dhcp-4.2.5-58.el7_4.1.src.rpm

x86_64:
dhclient-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-common-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-libs-4.2.5-58.el7_4.1.i686.rpm
dhcp-libs-4.2.5-58.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
dhcp-debuginfo-4.2.5-58.el7_4.1.i686.rpm
dhcp-debuginfo-4.2.5-58.el7_4.1.x86_64.rpm
dhcp-devel-4.2.5-58.el7_4.1.i686.rpm
dhcp-devel-4.2.5-58.el7_4.1.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/

7. References:

https://access.redhat.com/security/cve/CVE-2017-3144
https://access.redhat.com/security/updates/classification/#moderate
https://kb.isc.org/article/AA-01541

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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