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CVE-2016-1548

UnknownEPSS 3.84%

Last modified

CVE-2016-1548 is a vulnerability of currently unknown severity. 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. EPSS estimates a 3.84% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
3.84%

88.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
NtpNtp4.2.8P4

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2016-1548?
Severity scoring for CVE-2016-1548 is pending analysis. The EPSS model estimates a 3.84% probability of exploitation in the next 30 days.
How do I fix CVE-2016-1548?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-1548?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST