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Red Hat: RHSA-2021:2469-01 Important: DHCP Buffer Overflow Fix

red hat
Calendar Grey June 17, 2021
Dist Redhat Esm H88
Crucial DHCP security patch released for Red Hat Enterprise Linux, targeting a critical stack overflow vulnerability.
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 Lin...

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 buffer overflow red hat security fix important network configuration dhcp

References

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

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


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.6Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.6 Update Services for SAPSolutions.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 buffer overflow red hat security fix important network configuration dhcp

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

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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