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Critical Advisory RHSA-2018:1455-01: Red Hat Enterprise Linux 7.4 DHCP Flaw

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Calendar Grey May 15, 2018
Scroller Redhat
Ubuntu announces an urgent SSH security patch to address command execution vulnerabilities in Server Edition. Update your systems immediately!
An update for dhcp is now available for Red Hat Enterprise Linux 7.4 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):
* A command injection flaw was found in the NetworkManager integration script included in the DHCP client packages in Red Hat Enterprise Linux. A malicious DHCP server, or an attacker on the local network able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges on systems using NetworkManager and configured to obtain network configuration using the DHCP protocol. (CVE-2018-1111)
Red Hat would like to thank Felix Wilhelm (Google Security Team) for reporting this issue.

Topics%20covered

Topics Covered

security advisory update critical Red Hat Enterprise command injection network manager dhcp security

References

https://access.redhat.com/security/cve/CVE-2018-1111 https://access.redhat.com/security/updates/classification#critical https://access.redhat.com/security/vulnerabilities/89cb0ad0-d22b-4c2b-ae2e-6fecd4077c8a

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4):
Source: dhcp-4.2.5-58.el7_4.4.src.rpm
x86_64: dhclient-4.2.5-58.el7_4.4.x86_64.rpm dhcp-common-4.2.5-58.el7_4.4.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.x86_64.rpm dhcp-libs-4.2.5-58.el7_4.4.i686.rpm dhcp-libs-4.2.5-58.el7_4.4.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):
x86_64: dhcp-4.2.5-58.el7_4.4.x86_64.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.i686.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.x86_64.rpm dhcp-devel-4.2.5-58.el7_4.4.i686.rpm dhcp-devel-4.2.5-58.el7_4.4.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.4):
Source: dhcp-4.2.5-58.el7_4.4.src.rpm
ppc64: dhclient-4.2.5-58.el7_4.4.ppc64.rpm dhcp-4.2.5-58.el7_4.4.ppc64.rpm dhcp-common-4.2.5-58.el7_4.4.ppc64.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.ppc.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.ppc64.rpm dhcp-libs-4.2.5-58.el7_4.4.ppc.rpm dhcp-libs-4.2.5-58.el7_4.4.ppc64.rpm
ppc64le: dhclient-4.2.5-58.el7_4.4.ppc64le.rpm dhcp-4.2.5-58.el7_4.4.ppc64le.rpm dhcp-common-4.2.5-58.el7_4.4.ppc64le.rpm dhcp-debuginfo-4.2.5-58.el7_4.4.ppc64le.rpm dhcp-libs-4.2.5-58.el7_4.4.ppc64le.rpm
s390x: dhclient-4.2.5-58.el7_4.4.s390x.rpm dhcp-4.2.5-58.el7_4.4.s390x.rpm dhcp-common-4.2.5-58.el7_4.4.s390x.rpm

Read the Full Advisory


Severity
critical
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1455-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1455
Issue date: 2018-05-15

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.4Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Critical. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory update critical Red Hat Enterprise command injection network manager dhcp security

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) - x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.4) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, s390x, x86_64

Bugs Fixed

1567974 - CVE-2018-1111 dhcp: Command injection vulnerability in the DHCP client NetworkManager integration script

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