Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2019.2933
dhcp security and bug fix update
7 August 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: dhcp
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6470
Original Bulletin:
https://access.redhat.com/errata/RHSA-2019:2060
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 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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