CVE-2018-6923 Denial of service in FreeBSD

High 7.5 Published 4 Sep 2018 Updated 16 Sep 2024

Remote attackers can cause excessive resource consumption and denial of service by sending arbitrary IP fragments to vulnerable FreeBSD systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-6923?

CVE-2018-6923 is a high-severity denial of service vulnerability in Freebsd Freebsd, published on 4 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In FreeBSD before 11.1-STABLE, 11.2-RELEASE-p2, 11.1-RELEASE-p13, ip fragment reassembly code is vulnerable to a denial of service due to excessive system resource consumption. This issue can allow a remote attacker who is able to send an arbitrary ip fragments to cause the machine to consume excessive resources.

Weakness: CWE-400

Which versions are affected by CVE-2018-6923?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2018-6923?

No fix has been published for CVE-2018-6923 yet. Limit exposure of the affected software until one is available.

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-2018-6923 being exploited?

There is no known exploitation of CVE-2018-6923 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-cvhm-gj56-whx3.