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

Synopsis:          Important: dhcp security update
Advisory ID:       RHSA-2021:2419-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:2419
Issue date:        2021-06-14
CVE Names:         CVE-2021-25217 
=====================================================================

1. Summary:

An update for dhcp is now available for Red Hat Enterprise Linux 6 Extended
Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 Server (v. 6 ELS) - i386, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6 ELS) - i386, 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: stack-based buffer overflow when parsing statements with
colon-separated hex digits in config or lease files in dhcpd and dhclient
(CVE-2021-25217)

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.

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/):

1963258 - CVE-2021-25217 dhcp: stack-based buffer overflow when parsing
 statements with colon-separated hex digits in config or lease files in dhcpd and dhclient

6. Package List:

Red Hat Enterprise Linux Server (v. 6 ELS):

Source:
dhcp-4.1.1-64.P1.el6_10.src.rpm

i386:
dhclient-4.1.1-64.P1.el6_10.i686.rpm
dhcp-4.1.1-64.P1.el6_10.i686.rpm
dhcp-common-4.1.1-64.P1.el6_10.i686.rpm
dhcp-debuginfo-4.1.1-64.P1.el6_10.i686.rpm

s390x:
dhclient-4.1.1-64.P1.el6_10.s390x.rpm
dhcp-4.1.1-64.P1.el6_10.s390x.rpm
dhcp-common-4.1.1-64.P1.el6_10.s390x.rpm
dhcp-debuginfo-4.1.1-64.P1.el6_10.s390x.rpm

x86_64:
dhclient-4.1.1-64.P1.el6_10.x86_64.rpm
dhcp-4.1.1-64.P1.el6_10.x86_64.rpm
dhcp-common-4.1.1-64.P1.el6_10.x86_64.rpm
dhcp-debuginfo-4.1.1-64.P1.el6_10.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6 ELS):

i386:
dhcp-debuginfo-4.1.1-64.P1.el6_10.i686.rpm
dhcp-devel-4.1.1-64.P1.el6_10.i686.rpm

s390x:
dhcp-debuginfo-4.1.1-64.P1.el6_10.s390.rpm
dhcp-debuginfo-4.1.1-64.P1.el6_10.s390x.rpm
dhcp-devel-4.1.1-64.P1.el6_10.s390.rpm
dhcp-devel-4.1.1-64.P1.el6_10.s390x.rpm

x86_64:
dhcp-debuginfo-4.1.1-64.P1.el6_10.i686.rpm
dhcp-debuginfo-4.1.1-64.P1.el6_10.x86_64.rpm
dhcp-devel-4.1.1-64.P1.el6_10.i686.rpm
dhcp-devel-4.1.1-64.P1.el6_10.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-2021-25217
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2021 Red Hat, Inc.
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