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CVE-2016-2517

Date: January 30, 2017

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.

Severity Score

Related Resources (12)

https://security.netapp.com/advisory/ntap-20171004-0002/
http://support.ntp.org/bin/view/Main/NtpBug3010
https://security.gentoo.org/glsa/201607-15
https://security-tracker.debian.org/tracker/CVE-2016-2517
https://www.kb.cert.org/vuls/id/718152
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-2517
https://nvd.nist.gov/vuln/detail/CVE-2016-2517
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
http://www.securityfocus.com/bid/88189
http://www.securitytracker.com/id/1035705
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
https://www.mend.io/vulnerability-database/CVE-2016-2517

Severity Score

Weakness Type (CWE)

Input Validation

CWE-20

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): HIGH
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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