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Red Hat: RHSA-2021:2405-01 Important: DHCP Buffer Overflow Threat

red hat
Calendar Grey June 14, 2021
Dist Redhat Esm H88
A crucial security patch for Red Hat Enterprise Linux resolves severe buffer overflow vulnerabilities in the DHCP service.
An update for dhcp is now available for Red Hat Enterprise Linux 7.7 Extended Update Support

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

Summary

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.

Topics%20covered

Topics Covered

security advisory update buffer overflow important red hat enterprise dhcp stack overflow

References

https://access.redhat.com/security/cve/CVE-2021-25217 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.7):
Source: dhcp-4.2.5-77.el7_7.1.src.rpm
x86_64: dhclient-4.2.5-77.el7_7.1.x86_64.rpm dhcp-common-4.2.5-77.el7_7.1.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.i686.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.x86_64.rpm dhcp-libs-4.2.5-77.el7_7.1.i686.rpm dhcp-libs-4.2.5-77.el7_7.1.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7):
x86_64: dhcp-4.2.5-77.el7_7.1.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.i686.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.x86_64.rpm dhcp-devel-4.2.5-77.el7_7.1.i686.rpm dhcp-devel-4.2.5-77.el7_7.1.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.7):
Source: dhcp-4.2.5-77.el7_7.1.src.rpm
ppc64: dhclient-4.2.5-77.el7_7.1.ppc64.rpm dhcp-4.2.5-77.el7_7.1.ppc64.rpm dhcp-common-4.2.5-77.el7_7.1.ppc64.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.ppc.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.ppc64.rpm dhcp-libs-4.2.5-77.el7_7.1.ppc.rpm dhcp-libs-4.2.5-77.el7_7.1.ppc64.rpm
ppc64le: dhclient-4.2.5-77.el7_7.1.ppc64le.rpm dhcp-4.2.5-77.el7_7.1.ppc64le.rpm dhcp-common-4.2.5-77.el7_7.1.ppc64le.rpm dhcp-debuginfo-4.2.5-77.el7_7.1.ppc64le.rpm dhcp-libs-4.2.5-77.el7_7.1.ppc64le.rpm
s390x: dhclient-4.2.5-77.el7_7.1.s390x.rpm dhcp-4.2.5-77.el7_7.1.s390x.rpm dhcp-common-4.2.5-77.el7_7.1.s390x.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2405-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2405
Issue date: 2021-06-14

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.7Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory update buffer overflow important red hat enterprise dhcp stack overflow

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.7) - ppc64, ppc64le, s390x, x86_64

Bugs Fixed

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

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