Synopsis

Critical: dhcp security update

Type/Severity

Security Advisory: Critical

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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.

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

Affected Products

• Red Hat Enterprise Linux Server - AUS 6.6 x86_64
• Red Hat Enterprise Linux Server - TUS 6.6 x86_64

Fixes

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

CVEs

• CVE-2018-1111

References

• https://access.redhat.com/security/updates/classification/#critical
• https://access.redhat.com/security/vulnerabilities/3442151

Red Hat Enterprise Linux Server - AUS 6.6

SRPM
dhcp-4.1.1-43.P1.el6_6.2.src.rpm	SHA-256: bff0bebdb00add5294f806dffd87f9fdd07344385c9a215feb00396142f2c6bc
x86_64
dhclient-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: 06cabe3d43e98e6c92ed50fc767a2ea2066bbc10967dd97880f18732ded0efe3
dhcp-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: 4904bdb4fc220b3f1a2a789ba4845b5b486e88d05639dfa621ffad482fc4897d
dhcp-common-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: ead1d93b2592333b37db1fe33f7a966f5d2ab7ca58a6abd1d18dc35971dd704e
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.i686.rpm	SHA-256: 8c08bffd51e38470ea727e782d4c809c9ccb7d88c4bad58b829e8cbbb01fefed
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: b9a144c7cbbe7349f9ef3b341ce60a6ec7e54a7b568b0c3ded547214d947fc74
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: b9a144c7cbbe7349f9ef3b341ce60a6ec7e54a7b568b0c3ded547214d947fc74
dhcp-devel-4.1.1-43.P1.el6_6.2.i686.rpm	SHA-256: 96de699bc15ca6d3b9dc5502b051e6ab775c776419f375194d00fce609783af5
dhcp-devel-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: f75d2f934dcfb6e04d220535e82087a2a3b6b42e86f6f93e26340ca6576747f1

Red Hat Enterprise Linux Server - TUS 6.6

SRPM
dhcp-4.1.1-43.P1.el6_6.2.src.rpm	SHA-256: bff0bebdb00add5294f806dffd87f9fdd07344385c9a215feb00396142f2c6bc
x86_64
dhclient-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: 06cabe3d43e98e6c92ed50fc767a2ea2066bbc10967dd97880f18732ded0efe3
dhcp-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: 4904bdb4fc220b3f1a2a789ba4845b5b486e88d05639dfa621ffad482fc4897d
dhcp-common-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: ead1d93b2592333b37db1fe33f7a966f5d2ab7ca58a6abd1d18dc35971dd704e
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.i686.rpm	SHA-256: 8c08bffd51e38470ea727e782d4c809c9ccb7d88c4bad58b829e8cbbb01fefed
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: b9a144c7cbbe7349f9ef3b341ce60a6ec7e54a7b568b0c3ded547214d947fc74
dhcp-debuginfo-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: b9a144c7cbbe7349f9ef3b341ce60a6ec7e54a7b568b0c3ded547214d947fc74
dhcp-devel-4.1.1-43.P1.el6_6.2.i686.rpm	SHA-256: 96de699bc15ca6d3b9dc5502b051e6ab775c776419f375194d00fce609783af5
dhcp-devel-4.1.1-43.P1.el6_6.2.x86_64.rpm	SHA-256: f75d2f934dcfb6e04d220535e82087a2a3b6b42e86f6f93e26340ca6576747f1