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Red Hat Enterprise Linux 7 RHSA-2018:0483-01 Important dhcp Security Fix

red hat
Calendar Grey March 12, 2018
Dist Redhat Esm H88
Investigate essential security enhancements for DHCP that affect Red Hat Enterprise Linux, ensuring the protection of your network settings.
An update for dhcp is now available for Red Hat Enterprise Linux 7

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: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server (CVE-2018-5732)
* dhcp: Reference count overflow in dhcpd allows denial of service (CVE-2018-5733)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Red Hat would like to thank ISC for reporting these issues. Upstream acknowledges Felix Wilhelm (Google) as the original reporter of these issues.

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow red hat important network configuration dhcp

References

https://access.redhat.com/security/cve/CVE-2018-5732 https://access.redhat.com/security/cve/CVE-2018-5733 https://access.redhat.com/security/updates/classification#important https://kb.isc.org/docs/aa-01565 https://kb.isc.org/docs/aa-01567

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: dhcp-4.2.5-58.el7_4.3.src.rpm
x86_64: dhclient-4.2.5-58.el7_4.3.x86_64.rpm dhcp-common-4.2.5-58.el7_4.3.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.x86_64.rpm dhcp-libs-4.2.5-58.el7_4.3.i686.rpm dhcp-libs-4.2.5-58.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: dhcp-4.2.5-58.el7_4.3.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.x86_64.rpm dhcp-devel-4.2.5-58.el7_4.3.i686.rpm dhcp-devel-4.2.5-58.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: dhcp-4.2.5-58.el7_4.3.src.rpm
x86_64: dhclient-4.2.5-58.el7_4.3.x86_64.rpm dhcp-common-4.2.5-58.el7_4.3.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.x86_64.rpm dhcp-libs-4.2.5-58.el7_4.3.i686.rpm dhcp-libs-4.2.5-58.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: dhcp-4.2.5-58.el7_4.3.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.3.x86_64.rpm dhcp-devel-4.2.5-58.el7_4.3.i686.rpm dhcp-devel-4.2.5-58.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: dhcp-4.2.5-58.el7_4.3.src.rpm
ppc64: dhclient-4.2.5-58.el7_4.3.ppc64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:0483-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0483
Issue date: 2018-03-12

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.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 denial of service buffer overflow red hat important network configuration dhcp

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le

Bugs Fixed

1549960 - CVE-2018-5732 dhcp: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server

1549961 - CVE-2018-5733 dhcp: Reference count overflow in dhcpd allows denial of service

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