medium
5.9
CWE
20
Advisory Published
CVE Published
Updated

CVE-2016-9042: Input Validation

First published: Mon Sep 25 2017(Updated: )

An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.

Credit: Cure53 Cure53 Cure53 Cure53 Cure53 Cure53 Cure53 Cure53 Cure53 Matthew Van Gundy Cisco talos-cna@cisco.com talos-cna@cisco.com

Affected SoftwareAffected VersionHow to fix
Apple macOS High Sierra<10.13
10.13
Siemens SIMATIC NET CP 443-1 OPC UA
NTP ntp=4.2.8-p9
FreeBSD FreeBSD=10.0
FreeBSD FreeBSD=11.0
Hpe Hpux-ntp<c.4.2.8.4.0
All of
Siemens Simatic Net Cp 443-1 Opc Ua Firmware
Siemens SIMATIC NET CP 443-1 OPC UA
Siemens Simatic Net Cp 443-1 Opc Ua Firmware
Siemens SIMATIC NET CP 443-1 OPC UA
debian/ntp
1:4.2.8p15+dfsg-1

Remedy

http://bk1.ntp.org/ntp-stable/?PAGE=cset&REV=58b56309OyBGP4pGEYHVzLh4VoQ8pg

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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 vulnerability CVE-2016-9042?

    Vulnerability CVE-2016-9042 is a denial of service vulnerability in ntpd 4.2.8p9.

  • How can the denial of service vulnerability in ntpd 4.2.8p9 be exploited?

    The denial of service vulnerability in ntpd 4.2.8p9 can be exploited using a specially crafted unauthenticated network packet to reset the expected origin timestamp for target peers.

  • What is the severity of vulnerability CVE-2016-9042?

    The severity of vulnerability CVE-2016-9042 is medium with a CVSS score of 5.9.

  • Which software versions are affected by vulnerability CVE-2016-9042?

    Software versions 4.2.8p9 of ntp and 10.0 and 11.0 of FreeBSD are affected by vulnerability CVE-2016-9042.

  • How do I fix vulnerability CVE-2016-9042?

    To fix vulnerability CVE-2016-9042, update to version 4.2.8p10 of ntp.

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