CVE-2018-8956 Denial of service in n/a
Remote attackers can prevent NTP clients from synchronizing clocks by spoofing packets, requiring access to the broadcast network or a compromised slave.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-8956?
CVE-2018-8956 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 6 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.
Weakness: CWE-20
Which versions are affected by CVE-2018-8956?
It affects 1 product.
Products include Ntp Ntp.
How do I fix CVE-2018-8956?
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-2018-8956 being exploited?
There is no known exploitation of CVE-2018-8956 in the wild and no public exploit code.
Other vulnerabilities in Ntp Ntp
Sources
Also known as DEBIAN-CVE-2018-8956, GHSA-gg7p-jc5w-p68m, UBUNTU-CVE-2018-8956.