ESB-2018.0271 - [UNIX/Linux][RedHat] dhcp: Denial of service - Remote/unauthenticated 2018-01-29

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0271
                      Moderate: dhcp security update
                              29 January 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           dhcp
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux WS/Desktop 7
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-3144  

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2018:0158

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Red Hat. It is recommended that administrators
         running dhcp check for an updated version of the software for their
         operating system.

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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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