Important: dhcp

Issue Overview:

Buffer overflow in dhclient possibly allowing code execution triggered by malicious server
An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet. (CVE-2018-5732)

Reference count overflow in dhcpd allows denial of service
A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic. (CVE-2018-5733)

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-4.2.5-58.amzn2.3.2.src  
  
x86_64:  
    dhcp-4.2.5-58.amzn2.3.2.x86_64  
    dhclient-4.2.5-58.amzn2.3.2.x86_64  
    dhcp-common-4.2.5-58.amzn2.3.2.x86_64  
    dhcp-libs-4.2.5-58.amzn2.3.2.x86_64  
    dhcp-devel-4.2.5-58.amzn2.3.2.x86_64  
    dhcp-debuginfo-4.2.5-58.amzn2.3.2.x86_64  

Additional References

Red Hat: CVE-2018-5732, CVE-2018-5733

Mitre: CVE-2018-5732, CVE-2018-5733