Vulnerability in Ntp
CVE-2016-1548
An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.
EPSS: 0.038 (89.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L.
Affected products
- Ntp — versions 4.2.8
- Ntp Project — versions 4.2.8p4
- Ntpsec Project — versions aa48d001683e5b791a743ec9c575aaf7d867a2b0c
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cret@cert.org (x_refsource_UBUNTU, vendor-advisory)
- cret@cert.org (vendor-advisory, x_refsource_DEBIAN)
- cret@cert.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cret@cert.org (x_refsource_CONFIRM)
- cret@cert.org (x_refsource_REDHAT, vendor-advisory)
- cret@cert.org (vendor-advisory, x_refsource_SUSE)
- cret@cert.org (vdb-entry, x_refsource_BID)
- cret@cert.org (x_refsource_CERT-VN, third-party-advisory)
- cret@cert.org (x_refsource_REDHAT, vendor-advisory)
- cret@cert.org (vdb-entry, x_refsource_SECTRACK)
Frequently asked questions
- What is CVE-2016-1548?
- CVE-2016-1548 is a high-severity vulnerability in Ntp, classified under CWE-19. CVSS score: 7.2/10. Published 2017-01-06.
- How severe is CVE-2016-1548?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2016-1548 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.