medium
6.5
CWE
20
Advisory Published
CVE Published
Updated

CVE-2017-6464: Input Validation

First published: Mon Mar 20 2017(Updated: )

A vulnerability found in the NTP server makes it possible for an authenticated remote user to crash ntpd via a malformed mode configuration directive. Mitigation: Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.

Credit: cve@mitre.org Cure53 Matthew Van Gundy Cisco

Affected SoftwareAffected VersionHow to fix
NTP ntp=4.2.8-p9
NTP ntp=4.3.0
NTP ntp=4.3.1
NTP ntp=4.3.2
NTP ntp=4.3.3
NTP ntp=4.3.4
NTP ntp=4.3.5
NTP ntp=4.3.6
NTP ntp=4.3.7
NTP ntp=4.3.8
NTP ntp=4.3.9
NTP ntp=4.3.10
NTP ntp=4.3.11
NTP ntp=4.3.12
NTP ntp=4.3.13
NTP ntp=4.3.14
NTP ntp=4.3.15
NTP ntp=4.3.16
NTP ntp=4.3.17
NTP ntp=4.3.18
NTP ntp=4.3.19
NTP ntp=4.3.20
NTP ntp=4.3.21
NTP ntp=4.3.22
NTP ntp=4.3.23
NTP ntp=4.3.24
NTP ntp=4.3.25
NTP ntp=4.3.26
NTP ntp=4.3.27
NTP ntp=4.3.28
NTP ntp=4.3.29
NTP ntp=4.3.30
NTP ntp=4.3.31
NTP ntp=4.3.32
NTP ntp=4.3.33
NTP ntp=4.3.34
NTP ntp=4.3.35
NTP ntp=4.3.36
NTP ntp=4.3.37
NTP ntp=4.3.38
NTP ntp=4.3.39
NTP ntp=4.3.40
NTP ntp=4.3.41
NTP ntp=4.3.42
NTP ntp=4.3.43
NTP ntp=4.3.44
NTP ntp=4.3.45
NTP ntp=4.3.46
NTP ntp=4.3.47
NTP ntp=4.3.48
NTP ntp=4.3.49
NTP ntp=4.3.50
NTP ntp=4.3.51
NTP ntp=4.3.52
NTP ntp=4.3.53
NTP ntp=4.3.54
NTP ntp=4.3.55
NTP ntp=4.3.56
NTP ntp=4.3.57
NTP ntp=4.3.58
NTP ntp=4.3.59
NTP ntp=4.3.60
NTP ntp=4.3.61
NTP ntp=4.3.62
NTP ntp=4.3.63
NTP ntp=4.3.64
NTP ntp=4.3.65
NTP ntp=4.3.66
NTP ntp=4.3.67
NTP ntp=4.3.68
NTP ntp=4.3.69
NTP ntp=4.3.70
NTP ntp=4.3.71
NTP ntp=4.3.72
NTP ntp=4.3.73
NTP ntp=4.3.74
NTP ntp=4.3.75
NTP ntp=4.3.76
NTP ntp=4.3.77
NTP ntp=4.3.78
NTP ntp=4.3.79
NTP ntp=4.3.80
NTP ntp=4.3.81
NTP ntp=4.3.82
NTP ntp=4.3.83
NTP ntp=4.3.84
NTP ntp=4.3.85
NTP ntp=4.3.86
NTP ntp=4.3.87
NTP ntp=4.3.88
NTP ntp=4.3.89
NTP ntp=4.3.90
NTP ntp=4.3.91
NTP ntp=4.3.92
NTP ntp=4.3.93
redhat/ntp<4.2.8
4.2.8
redhat/ntp<4.3.94
4.3.94
debian/ntp
1:4.2.8p15+dfsg-1
macOS High Sierra<10.13
10.13

Remedy

http://support.ntp.org/bin/view/Main/NtpBug3389

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2017-6464?

    CVE-2017-6464 is considered a moderate severity vulnerability due to its ability to crash ntpd instances with a malformed configuration directive.

  • How do I fix CVE-2017-6464?

    To fix CVE-2017-6464, upgrade to NTP versions 4.2.8p10 or higher, or other patched versions.

  • Which versions of NTP are affected by CVE-2017-6464?

    CVE-2017-6464 affects NTP versions before 4.3.94 and 4.2.8p10.

  • Can CVE-2017-6464 be exploited remotely?

    Yes, CVE-2017-6464 can be exploited by authenticated remote users.

  • What is the recommended mitigation for CVE-2017-6464?

    The recommended mitigation is to monitor ntpd instances and ensure they auto-restart if stopped running.

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