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)
EPSS: 0.051 (91.5th percentile) — read the EPSS interpretation.
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.
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
- cret@cert.org (vdb-entry, x_refsource_BID)
- cret@cert.org (vendor-advisory, x_refsource_DEBIAN)
- cret@cert.org (x_refsource_CONFIRM)
- cret@cert.org (x_refsource_REDHAT, vendor-advisory)
- cret@cert.org (x_refsource_REDHAT, vendor-advisory)
- cret@cert.org (vdb-entry, x_refsource_SECTRACK)
- cret@cert.org (x_refsource_CONFIRM)
- cret@cert.org (x_refsource_CONFIRM)
- cret@cert.org (Technical Description, Third Party Advisory, x_refsource_MISC, Mitigation)
- cret@cert.org (x_refsource_FREEBSD, 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.