CVE-2016-1551 Security feature bypass in NTP
Attackers can spoof reference clock packets to manipulate system time if OS-level martian packet filtering is disabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-1551?
CVE-2016-1551 is a low-severity vulnerability in Ntp Ntp, published on 27 Jan 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to protect it from requests that impersonate reference clocks. Because reference clocks are treated like other peers and stored in the same structure, any packet with a source ip address of a reference clock (127.127.1.1 for example) that reaches the receive() function will match that reference clock's peer record and will be treated as a trusted peer. Any system that lacks the typical martian packet filtering which would block these packets is in danger of having its time controlled by an attacker.
Weakness: CWE-254
Which versions are affected by CVE-2016-1551?
It affects 2 products.
Products include Ntp Ntp, Ntpsec Ntpsec.
How do I fix CVE-2016-1551?
Apply the vendor's patch.
Is CVE-2016-1551 being exploited?
There is no known exploitation of CVE-2016-1551 in the wild and no public exploit code.
Other vulnerabilities in Ntp Ntp
Sources
Also known as GHSA-xhrh-m85j-g7hf.