RHSA-2021:2420: Important: dhcp security update
First published: Mon Jun 14 2021(Updated: )
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.<br>Security Fix(es):<br><li> 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)</li> 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.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/dhcp | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-common | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debugsource | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debugsource | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-debugsource | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-libs-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-relay-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-server-debuginfo | <4.3.6-40.el8_2.2 | 4.3.6-40.el8_2.2 |
| redhat/dhcp-client | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-client-debuginfo | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-debuginfo | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-debugsource | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-libs | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-libs-debuginfo | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-relay | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-relay-debuginfo | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-server | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
| redhat/dhcp-server-debuginfo | <4.3.6-40.el8_2.2.aa | 4.3.6-40.el8_2.2.aa |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:2420?
The severity of RHSA-2021:2420 is classified as important.
How do I fix RHSA-2021:2420?
To resolve RHSA-2021:2420, update the affected dhcp packages to version 4.3.6-40.el8_2.2 or later.
What packages are affected by RHSA-2021:2420?
The affected packages in RHSA-2021:2420 include dhcp, dhcp-client, dhcp-server, and others related to the DHCP services.
Is RHSA-2021:2420 exploitable?
Yes, RHSA-2021:2420 may be exploitable under certain conditions, making it vital to apply the updates.
When was RHSA-2021:2420 released?
RHSA-2021:2420 was released to address vulnerabilities in the DHCP service on July 14, 2021.
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