high
7.5
CWE
346
Advisory Published
CVE Published
Updated

CVE-2020-11868

First published: Mon Jun 03 2019(Updated: )

NTP is vulnerable to a denial of service, caused by a flaw in ntpd. By sending a server mode packet with a spoofed source IP address, a remote attacker could exploit this vulnerability to block unauthenticated synchronization resulting in a denial of service condition.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/ntp<4.2.8
4.2.8
redhat/ntp<4.3.100
4.3.100
NTP ntp<=4.2.7
NTP ntp>=4.3.98<4.3.100
NTP ntp=4.2.8
NTP ntp=4.2.8-p1
NTP ntp=4.2.8-p1-beta1
NTP ntp=4.2.8-p1-beta2
NTP ntp=4.2.8-p1-beta3
NTP ntp=4.2.8-p1-beta4
NTP ntp=4.2.8-p1-beta5
NTP ntp=4.2.8-p1-rc1
NTP ntp=4.2.8-p1-rc2
NTP ntp=4.2.8-p10
NTP ntp=4.2.8-p11
NTP ntp=4.2.8-p12
NTP ntp=4.2.8-p13
NTP ntp=4.2.8-p2
NTP ntp=4.2.8-p2-rc1
NTP ntp=4.2.8-p2-rc2
NTP ntp=4.2.8-p2-rc3
NTP ntp=4.2.8-p3
NTP ntp=4.2.8-p3-rc1
NTP ntp=4.2.8-p3-rc2
NTP ntp=4.2.8-p3-rc3
NTP ntp=4.2.8-p4
NTP ntp=4.2.8-p5
NTP ntp=4.2.8-p6
NTP ntp=4.2.8-p7
NTP ntp=4.2.8-p8
NTP ntp=4.2.8-p9
Redhat Enterprise Linux=7.0
Netapp Data Ontap 7-mode
Netapp Hci Management Node
Netapp Solidfire
Netapp Vasa Provider For Clustered Data Ontap>=7.2
Netapp Vasa Provider For Clustered Data Ontap Vsphere>=7.2
Netapp Virtual Storage Console Vsphere>=7.2
NetApp Clustered Data ONTAP
Netapp Hci Storage Node Firmware
Netapp Hci Storage Node
Netapp Fabric-attached Storage 8300 Firmware
Netapp Fabric-attached Storage 8300
Netapp Fabric-attached Storage 8700 Firmware
Netapp Fabric-attached Storage 8700
Netapp Fabric-attached Storage A400 Firmware
Netapp Fabric-attached Storage A400
Netapp All Flash Fabric-attached Storage 8300 Firmware
Netapp All Flash Fabric-attached Storage 8300
Netapp All Flash Fabric-attached Storage 8700 Firmware
Netapp All Flash Fabric-attached Storage 8700
Netapp All Flash Fabric-attached Storage A400 Firmware
Netapp All Flash Fabric-attached Storage A400
Debian Debian Linux=8.0
openSUSE Leap=15.1
openSUSE Leap=15.2
IBM Data Risk Manager<=2.0.6

Remedy

http://support.ntp.org/bin/view/Main/NtpBug3592

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-11868?

    CVE-2020-11868 is a vulnerability in ntpd that allows an off-path attacker to block unauthenticated synchronization.

  • Which versions of ntp are affected by CVE-2020-11868?

    ntpd versions before 4.2.8p14 and 4.3.x before 4.3.100 are affected.

  • How does CVE-2020-11868 allow an attacker to block unauthenticated synchronization?

    The attacker can use a server mode packet with a spoofed source IP address, which causes transmissions to be rescheduled even without a valid origin timestamp.

  • What is the severity of CVE-2020-11868?

    CVE-2020-11868 has a severity score of 7.5 (high).

  • Where can I find more information about CVE-2020-11868?

    More information about CVE-2020-11868 can be found in the references: [Bugzilla Red Hat](https://bugzilla.redhat.com/show_bug.cgi?id=1716661), [NTP Bug 3592](http://support.ntp.org/bin/view/Main/NtpBug3592), [Bugzilla Red Hat](https://bugzilla.redhat.com/show_bug.cgi?id=1824831).

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