Critical: dhcp

Issue Overview:

Command injection vulnerability in the DHCP client NetworkManager integration script:
A command injection flaw was found in the NetworkManager integration script included in the DHCP client packages in Amazon Linux 2. 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)

Note: Amazon Linux 2 does not use NetworkManager by default, however it is recommended to install this update.

Affected Packages:

dhcp

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update dhcp to update your system.

New Packages:

src:  
    dhcp-4.2.5-68.amzn2.1.2.src  
  
x86_64:  
    dhcp-4.2.5-68.amzn2.1.2.x86_64  
    dhclient-4.2.5-68.amzn2.1.2.x86_64  
    dhcp-common-4.2.5-68.amzn2.1.2.x86_64  
    dhcp-libs-4.2.5-68.amzn2.1.2.x86_64  
    dhcp-devel-4.2.5-68.amzn2.1.2.x86_64  
    dhcp-debuginfo-4.2.5-68.amzn2.1.2.x86_64  

Additional References

Red Hat: CVE-2018-1111

Mitre: CVE-2018-1111