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

Synopsis:          Important: dhcp security update
Advisory ID:       RHSA-2021:2469-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:2469
Issue date:        2021-06-17
CVE Names:         CVE-2021-25217 
=====================================================================

1. Summary:

An update for dhcp is now available for Red Hat Enterprise Linux 7.6
Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.6 Update Services for SAP
Solutions.

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 AUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server E4S (v. 7.6) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.6) - 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 AUS (v. 7.6):

Source:
dhcp-4.2.5-69.el7_6.1.src.rpm

x86_64:
dhclient-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-libs-4.2.5-69.el7_6.1.i686.rpm
dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.6):

Source:
dhcp-4.2.5-69.el7_6.1.src.rpm

ppc64le:
dhclient-4.2.5-69.el7_6.1.ppc64le.rpm
dhcp-4.2.5-69.el7_6.1.ppc64le.rpm
dhcp-common-4.2.5-69.el7_6.1.ppc64le.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.ppc64le.rpm
dhcp-libs-4.2.5-69.el7_6.1.ppc64le.rpm

x86_64:
dhclient-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-libs-4.2.5-69.el7_6.1.i686.rpm
dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 7.6):

Source:
dhcp-4.2.5-69.el7_6.1.src.rpm

x86_64:
dhclient-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-libs-4.2.5-69.el7_6.1.i686.rpm
dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.6):

x86_64:
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-devel-4.2.5-69.el7_6.1.i686.rpm
dhcp-devel-4.2.5-69.el7_6.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.6):

ppc64le:
dhcp-debuginfo-4.2.5-69.el7_6.1.ppc64le.rpm
dhcp-devel-4.2.5-69.el7_6.1.ppc64le.rpm

x86_64:
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-devel-4.2.5-69.el7_6.1.i686.rpm
dhcp-devel-4.2.5-69.el7_6.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.6):

x86_64:
dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm
dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm
dhcp-devel-4.2.5-69.el7_6.1.i686.rpm
dhcp-devel-4.2.5-69.el7_6.1.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-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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