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CVE-2016-2517

5.3 · MEDIUM

NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sendi…

Published Jan 30, 2017CWE-20EPSS 8.82%

Overview

CVE-2016-2517 is a medium-severity vulnerability. It was published on January 30, 2017 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsupport.ntp.org/bin/view/Main/NtpBug3010Refwww.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlRefwww.securityfocus.com/bid/88189Refwww.securitytracker.com/id/1035705Refsecurity.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.ascRefsecurity.gentoo.org/glsa/201607-15Refsecurity.netapp.com/advisory/ntap-20171004-0002/Refwww.kb.cert.org/vuls/id/718152Refsupport.ntp.org/bin/view/Main/NtpBug3010Refwww.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

How CyberStrike helps

Frequently asked questions

What is CVE-2016-2517?

CVE-2016-2517 is a medium-severity vulnerability. It was published on January 30, 2017 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2016-2517?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2016-2517?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-2517?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-2517 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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