CVE-2016-4956
The MITRE CVE dictionary describes this issue as:
ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (interleaved-mode transition and time change) via a spoofed broadcast packet. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-1548.
Find out more about CVE-2016-4956 from the MITRE CVE dictionary dictionary and NIST NVD.
CVSS v2 metrics
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 2.6 |
|---|---|
| Base Metrics | AV:N/AC:H/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | High |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Affected Packages State
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | ntp | Fix deferred |
| Red Hat Enterprise Linux 6 | ntp | Fix deferred |
| Red Hat Enterprise Linux 5 | ntp | Will not fix |
Acknowledgements
This issue was discovered by Miroslav Lichvar (Red Hat).Mitigation
Do not use NTP's broadcast mode in the clients by not configuring the "broadcastclient" directive in the ntp.conf file.
External References
CVE description copyright © 2017, The MITRE Corporation