[RHSA-2019:3525-01] Moderate: dhcp security and bug fix update

Tue Nov 5 21:32:31 UTC 2019

An update for dhcp is now available for Red Hat Enterprise Linux 8.

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 BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, 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 8.1 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/):

1660865 - ISC dhcpd cannot start TLS session to 389-DS after updating openldap rpm
1685560 - Avoid unnecessary DHCPD restarts by NetworkManager on certain UP events w.r.t. bug #565921
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 BaseOS (v. 8):

Source:
dhcp-4.3.6-34.el8.src.rpm

aarch64:
dhcp-client-4.3.6-34.el8.aarch64.rpm
dhcp-client-debuginfo-4.3.6-34.el8.aarch64.rpm
dhcp-debuginfo-4.3.6-34.el8.aarch64.rpm
dhcp-debugsource-4.3.6-34.el8.aarch64.rpm
dhcp-libs-4.3.6-34.el8.aarch64.rpm
dhcp-libs-debuginfo-4.3.6-34.el8.aarch64.rpm
dhcp-relay-4.3.6-34.el8.aarch64.rpm
dhcp-relay-debuginfo-4.3.6-34.el8.aarch64.rpm
dhcp-server-4.3.6-34.el8.aarch64.rpm
dhcp-server-debuginfo-4.3.6-34.el8.aarch64.rpm

noarch:
dhcp-common-4.3.6-34.el8.noarch.rpm

ppc64le:
dhcp-client-4.3.6-34.el8.ppc64le.rpm
dhcp-client-debuginfo-4.3.6-34.el8.ppc64le.rpm
dhcp-debuginfo-4.3.6-34.el8.ppc64le.rpm
dhcp-debugsource-4.3.6-34.el8.ppc64le.rpm
dhcp-libs-4.3.6-34.el8.ppc64le.rpm
dhcp-libs-debuginfo-4.3.6-34.el8.ppc64le.rpm
dhcp-relay-4.3.6-34.el8.ppc64le.rpm
dhcp-relay-debuginfo-4.3.6-34.el8.ppc64le.rpm
dhcp-server-4.3.6-34.el8.ppc64le.rpm
dhcp-server-debuginfo-4.3.6-34.el8.ppc64le.rpm

s390x:
dhcp-client-4.3.6-34.el8.s390x.rpm
dhcp-client-debuginfo-4.3.6-34.el8.s390x.rpm
dhcp-debuginfo-4.3.6-34.el8.s390x.rpm
dhcp-debugsource-4.3.6-34.el8.s390x.rpm
dhcp-libs-4.3.6-34.el8.s390x.rpm
dhcp-libs-debuginfo-4.3.6-34.el8.s390x.rpm
dhcp-relay-4.3.6-34.el8.s390x.rpm
dhcp-relay-debuginfo-4.3.6-34.el8.s390x.rpm
dhcp-server-4.3.6-34.el8.s390x.rpm
dhcp-server-debuginfo-4.3.6-34.el8.s390x.rpm

x86_64:
dhcp-client-4.3.6-34.el8.x86_64.rpm
dhcp-client-debuginfo-4.3.6-34.el8.i686.rpm
dhcp-client-debuginfo-4.3.6-34.el8.x86_64.rpm
dhcp-debuginfo-4.3.6-34.el8.i686.rpm
dhcp-debuginfo-4.3.6-34.el8.x86_64.rpm
dhcp-debugsource-4.3.6-34.el8.i686.rpm
dhcp-debugsource-4.3.6-34.el8.x86_64.rpm
dhcp-libs-4.3.6-34.el8.i686.rpm
dhcp-libs-4.3.6-34.el8.x86_64.rpm
dhcp-libs-debuginfo-4.3.6-34.el8.i686.rpm
dhcp-libs-debuginfo-4.3.6-34.el8.x86_64.rpm
dhcp-relay-4.3.6-34.el8.x86_64.rpm
dhcp-relay-debuginfo-4.3.6-34.el8.i686.rpm
dhcp-relay-debuginfo-4.3.6-34.el8.x86_64.rpm
dhcp-server-4.3.6-34.el8.x86_64.rpm
dhcp-server-debuginfo-4.3.6-34.el8.i686.rpm
dhcp-server-debuginfo-4.3.6-34.el8.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/8/html/8.1_release_notes/

8. Contact:

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

Copyright 2019 Red Hat, Inc.
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