CVE-2016-7426

Impact:
Moderate
Public Date:
2016-11-21
IAVA:
2017-A-0003
CWE:
CWE-400
Bugzilla:
1397345: CVE-2016-7426 ntp: Client rate limiting and server responses
It was found that when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources.

Find out more about CVE-2016-7426 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 4.3
Base Metrics AV:N/AC:M/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

CVSS v3 metrics

CVSS3 Base Score 5.9
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact High

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-2017:0252 2017-02-06
Red Hat Enterprise Linux 7 (ntp) RHSA-2017:0252 2017-02-06

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 ntp Will not fix

Mitigation

If you choose to use restrict default limited ..., be sure to use restrict source ... (without limited) to avoid this attack.

External References

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