Improper input validation in NTP
CVE-2016-1547
An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.051 (92.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.051 · newest: 0.051 · change: 0.000
Affected products
- NTP
- NTP Project — versions 4.2.8p3, 4.2.8p4
- Ntpsec Project — versions a5fb34b9cc89b92a8fef2f459004865c93bb7f92
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/88276 (vdb-entry)
- www.debian.org/security/2016/dsa-3629 (vendor-advisory)
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- access.redhat.com/errata/RHSA-2016:1141 (vendor-advisory)
- rhn.redhat.com/errata/RHSA-2016-1552.html (vendor-advisory)
- www.securitytracker.com/id/1035705 (vdb-entry)
- www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- security.netapp.com/advisory/ntap-20171004-0002/
- www.talosintelligence.com/reports/TALOS-2016-0081/ (Technical Description, Third Party Advisory, Mitigation)
- security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc (vendor-advisory)
Frequently asked questions
- What is CVE-2016-1547?
- CVE-2016-1547 is a medium-severity vulnerability in NTP, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2017-01-06.
- How severe is CVE-2016-1547?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2016-1547 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.