Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 524
Alerts This Week
Warning Icon 1 524

Red Hat 7.2 RHSA-2018:1457-01 Critical: DHCP Command Injection

red hat
Calendar Grey May 15, 2018
Scroller Redhat
Important security patch for Red Hat Enterprise Linux 7.2 resolves command injection vulnerability to improve network protection.
An update for dhcp is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 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):
* 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 Red Hat Enterprise Linux critical update command injection network safety dhcp security Red Hat 7.2

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 Server AUS (v. 7.2):
Source: dhcp-4.2.5-42.el7_2.1.src.rpm
x86_64: dhclient-4.2.5-42.el7_2.1.x86_64.rpm dhcp-4.2.5-42.el7_2.1.x86_64.rpm dhcp-common-4.2.5-42.el7_2.1.x86_64.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.i686.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.x86_64.rpm dhcp-libs-4.2.5-42.el7_2.1.i686.rpm dhcp-libs-4.2.5-42.el7_2.1.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.2):
Source: dhcp-4.2.5-42.el7_2.1.src.rpm
x86_64: dhclient-4.2.5-42.el7_2.1.x86_64.rpm dhcp-4.2.5-42.el7_2.1.x86_64.rpm dhcp-common-4.2.5-42.el7_2.1.x86_64.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.i686.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.x86_64.rpm dhcp-libs-4.2.5-42.el7_2.1.i686.rpm dhcp-libs-4.2.5-42.el7_2.1.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 7.2):
Source: dhcp-4.2.5-42.el7_2.1.src.rpm
x86_64: dhclient-4.2.5-42.el7_2.1.x86_64.rpm dhcp-4.2.5-42.el7_2.1.x86_64.rpm dhcp-common-4.2.5-42.el7_2.1.x86_64.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.i686.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.x86_64.rpm dhcp-libs-4.2.5-42.el7_2.1.i686.rpm dhcp-libs-4.2.5-42.el7_2.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.2):
x86_64: dhcp-debuginfo-4.2.5-42.el7_2.1.i686.rpm dhcp-debuginfo-4.2.5-42.el7_2.1.x86_64.rpm dhcp-devel-4.2.5-42.el7_2.1.i686.rpm dhcp-devel-4.2.5-42.el7_2.1.x86_64.rpm

Read the Full Advisory


Severity
critical
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1457-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1457
Issue date: 2018-05-15

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.2Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.2 Update Services for SAPSolutions.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 Red Hat Enterprise Linux critical update command injection network safety dhcp security Red Hat 7.2

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.2) - x86_64

Red Hat Enterprise Linux Server E4S (v. 7.2) - x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64

Red Hat Enterprise Linux Server TUS (v. 7.2) - x86_64

Bugs Fixed

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.