Improper input validation in NTP
CVE-2018-8956
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.031 (87.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.030 · newest: 0.031 · change: +0.001
Affected products
- NTP — versions 4.2.8
Weakness classification (CWE)
References
- www.ntp.org/ (Vendor Advisory)
- tools.ietf.org/html/rfc5905 (Third Party Advisory)
- nikhiltripathi.in/NTP_attack.pdf (Third Party Advisory)
- arxiv.org/abs/2005.01783 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20200518-0006/
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html (vendor-advisory)
Frequently asked questions
- What is CVE-2018-8956?
- CVE-2018-8956 is a medium-severity vulnerability in NTP, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2020-05-06.
- How severe is CVE-2018-8956?
- Medium severity. CVSS v3 base score is 5.3 out of 10.