CVE-2016-1548

Impact:
Moderate
Public Date:
2016-04-26
Bugzilla:
1331462: CVE-2016-1548 ntp: ntpd switching to interleaved mode with spoofed packets
It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client.

Find out more about CVE-2016-1548 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 6.4
Base Metrics AV:N/AC:L/Au:N/C:N/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 6 (ntp) RHSA-2016:1141 2016-05-31
Red Hat Enterprise Linux Extended Update Support 6.7 (ntp) RHSA-2016:1552 2016-08-03
Red Hat Enterprise Linux 7 (ntp) RHSA-2016:1141 2016-05-31

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 ntp Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

This issue was discovered by Miroslav Lichvar (Red Hat).

External References

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