CVE-2016-2517 Denial of service in n/a
Remote attackers can cause denial of service by preventing subsequent authentication in NTP, requiring knowledge of control or request keys.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-2517?
CVE-2016-2517 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 30 Jan 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.
Weakness: CWE-20
Which versions are affected by CVE-2016-2517?
It affects 1 product.
Products include Ntp Ntp.
How do I fix CVE-2016-2517?
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-2016-2517 being exploited?
There is no known exploitation of CVE-2016-2517 in the wild and no public exploit code.
Other vulnerabilities in Ntp Ntp
Sources
Also known as DEBIAN-CVE-2016-2517, GHSA-3gmh-m5h5-5234, UBUNTU-CVE-2016-2517.