CVE-2016-9042 Denial of service in Network Time Protocol
An attacker can cause a denial of service in ntpd by sending crafted packets that disrupt peer timestamp validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-9042?
CVE-2016-9042 is a low-severity denial of service vulnerability in Freebsd Freebsd, published on 4 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.
Weakness: CWE-20
Which versions are affected by CVE-2016-9042?
It affects 4 products.
Products include Freebsd Freebsd, Hpe Hpux-Ntp, Ntp Ntp, Siemens Simatic Net Cp 443-1 Opc Ua Firmware.
How do I fix CVE-2016-9042?
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-2016-9042 being exploited?
There is no known exploitation of CVE-2016-9042 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as DEBIAN-CVE-2016-9042, GHSA-7wvh-qg35-v45r.