ISC DHCP: Denial of service

Background

ISC DHCP is a Dynamic Host Configuration Protocol (DHCP) client/server.

Description

ISC DHCP is vulnerable to a memory exhaustion attack involving regular expressions sent by DHCP clients.

Impact

A remote attacker could send a specially crafted request from a malicious or spoofed client, potentially leading to a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All ISC DHCP users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/dhcp-4.2.5_p1"