CVE-2019-6474 A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

Medium 5.7 Published 16 Oct 2019 Updated 16 Sep 2024

A malformed DUID in a packet can cause the Kea DHCP6 server to fail on restart, leading to a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2019-6474?

CVE-2019-6474 is a medium-severity denial of service vulnerability in ISC Kea, published on 16 Oct 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2

Weakness: CWE-772

Which versions are affected by CVE-2019-6474?

It affects 1 product.

Products include Isc Kea.

How do I fix CVE-2019-6474?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-6474 being exploited?

There is no known exploitation of CVE-2019-6474 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2019-6474, DEBIAN-CVE-2019-6474, GHSA-qxx9-pw4x-fc72, UBUNTU-CVE-2019-6474.