Public Date:
1299442: CVE-2015-8138 ntp: missing check for zero originate timestamp
It was discovered that ntpd as a client did not correctly check the originate timestamp in received packets. A remote attacker could use this flaw to send a crafted packet to an ntpd client that would effectively disable synchronization with the server, or push arbitrary offset/delay measurements to modify the time on the client.

Find out more about CVE-2015-8138 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5 as they do not include the affected code, which was introduced in version 4.2.6 of NTP.

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 7 (ntp) RHSA-2016:0063 2016-01-25
Red Hat Enterprise Linux 6 (ntp) RHSA-2016:0063 2016-01-25
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.

External References

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