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Red Hat Security Advisory

Synopsis: Moderate: dhcp security and bug fix update
Advisory ID: RHSA-2019:2060-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2060
Issue date: 2019-08-06
CVE Names: CVE-2019-6470
=====================================================================

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

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):

* dhcp: double-deletion of the released addresses in the dhcpv6 code
leading to crash and possible DoS (CVE-2019-6470)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.7 Release Notes linked from the References section.

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/):

1574292 – “dhclient -I” shows “cant find device client” after upgrade
1613174 – ISC dhcpd cannot start TLS session to 389-DS after updating openldap rpm
1623792 – /var/lib/dhcpd/dhcpd.leases: file is too long to buffer. is displayed when dhcpd tries to start.
1672308 – Avoid unnecessary DHCPD restarts by NetworkManager on certain UP events w.r.t. bug #565921
1677382 – dhcp does not compile with rebased bind 9.11
1708641 – CVE-2019-6470 dhcp: double-deletion of the released addresses in the dhcpv6 code leading to crash and possible DoS

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
dhcp-4.2.5-77.el7.src.rpm

x86_64:
dhclient-4.2.5-77.el7.x86_64.rpm
dhcp-common-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-libs-4.2.5-77.el7.i686.rpm
dhcp-libs-4.2.5-77.el7.x86_64.rpm

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

x86_64:
dhcp-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-devel-4.2.5-77.el7.i686.rpm
dhcp-devel-4.2.5-77.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
dhcp-4.2.5-77.el7.src.rpm

x86_64:
dhclient-4.2.5-77.el7.x86_64.rpm
dhcp-common-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-libs-4.2.5-77.el7.i686.rpm
dhcp-libs-4.2.5-77.el7.x86_64.rpm

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

x86_64:
dhcp-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-devel-4.2.5-77.el7.i686.rpm
dhcp-devel-4.2.5-77.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
dhcp-4.2.5-77.el7.src.rpm

ppc64:
dhclient-4.2.5-77.el7.ppc64.rpm
dhcp-4.2.5-77.el7.ppc64.rpm
dhcp-common-4.2.5-77.el7.ppc64.rpm
dhcp-debuginfo-4.2.5-77.el7.ppc.rpm
dhcp-debuginfo-4.2.5-77.el7.ppc64.rpm
dhcp-libs-4.2.5-77.el7.ppc.rpm
dhcp-libs-4.2.5-77.el7.ppc64.rpm

ppc64le:
dhclient-4.2.5-77.el7.ppc64le.rpm
dhcp-4.2.5-77.el7.ppc64le.rpm
dhcp-common-4.2.5-77.el7.ppc64le.rpm
dhcp-debuginfo-4.2.5-77.el7.ppc64le.rpm
dhcp-libs-4.2.5-77.el7.ppc64le.rpm

s390x:
dhclient-4.2.5-77.el7.s390x.rpm
dhcp-4.2.5-77.el7.s390x.rpm
dhcp-common-4.2.5-77.el7.s390x.rpm
dhcp-debuginfo-4.2.5-77.el7.s390.rpm
dhcp-debuginfo-4.2.5-77.el7.s390x.rpm
dhcp-libs-4.2.5-77.el7.s390.rpm
dhcp-libs-4.2.5-77.el7.s390x.rpm

x86_64:
dhclient-4.2.5-77.el7.x86_64.rpm
dhcp-4.2.5-77.el7.x86_64.rpm
dhcp-common-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-libs-4.2.5-77.el7.i686.rpm
dhcp-libs-4.2.5-77.el7.x86_64.rpm

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

ppc64:
dhcp-debuginfo-4.2.5-77.el7.ppc.rpm
dhcp-debuginfo-4.2.5-77.el7.ppc64.rpm
dhcp-devel-4.2.5-77.el7.ppc.rpm
dhcp-devel-4.2.5-77.el7.ppc64.rpm

ppc64le:
dhcp-debuginfo-4.2.5-77.el7.ppc64le.rpm
dhcp-devel-4.2.5-77.el7.ppc64le.rpm

s390x:
dhcp-debuginfo-4.2.5-77.el7.s390.rpm
dhcp-debuginfo-4.2.5-77.el7.s390x.rpm
dhcp-devel-4.2.5-77.el7.s390.rpm
dhcp-devel-4.2.5-77.el7.s390x.rpm

x86_64:
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-devel-4.2.5-77.el7.i686.rpm
dhcp-devel-4.2.5-77.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
dhcp-4.2.5-77.el7.src.rpm

x86_64:
dhclient-4.2.5-77.el7.x86_64.rpm
dhcp-4.2.5-77.el7.x86_64.rpm
dhcp-common-4.2.5-77.el7.x86_64.rpm
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-libs-4.2.5-77.el7.i686.rpm
dhcp-libs-4.2.5-77.el7.x86_64.rpm

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

x86_64:
dhcp-debuginfo-4.2.5-77.el7.i686.rpm
dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm
dhcp-devel-4.2.5-77.el7.i686.rpm
dhcp-devel-4.2.5-77.el7.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-2019-6470
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index

8. Contact:

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

Copyright 2019 Red Hat, Inc.
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