Public Date:
1271070: CVE-2015-7704 ntp: disabling synchronization via crafted KoD packet
It was discovered that ntpd as a client did not correctly check timestamps in Kiss-of-Death packets. A remote attacker could use this flaw to send a crafted Kiss-of-Death packet to an ntpd client that would increase the client's polling interval value, and effectively disable synchronization with the server.

Find out more about CVE-2015-7704 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 and Red Hat Enterprise Linux 6.4, as they do not include support for KoD packets.

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-2015:1930 2015-10-26
Red Hat Enterprise Linux Extended Update Support 6.6 (ntp) RHSA-2015:2520 2015-11-26
Red Hat Enterprise Linux 7 (ntp) RHSA-2015:1930 2015-10-26
Red Hat Enterprise Linux Extended Update Support 6.5 (ntp) RHSA-2015:2520 2015-11-26

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.


Red Hat would like to thank Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg of Boston University for reporting this issue.

External References

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