The version of the remote NTP server is 4.x prior to 4.2.8p9. It is, therefore, affected by the following vulnerabilities :

  - A denial of service vulnerability exists when rate     limiting is configured for all associations, the limits     also being applied to responses received from the     configured sources. An unauthenticated, remote attacker     can exploit this, by periodically sending spoofed     packets, to keep rate limiting active, resulting in     valid responses not being accepted by ntpd from its     sources. (CVE-2016-7426)

  - A denial of service vulnerability exists in the     broadcast mode replay prevention functionality. An     unauthenticated, adjacent attacker can exploit this, via     specially crafted broadcast mode NTP packets     periodically injected into the broadcast domain, to     cause ntpd to reject broadcast mode packets from     legitimate NTP broadcast servers. (CVE-2016-7427)

  - A denial of service vulnerability exists in the     broadcast mode poll interval functionality. An     unauthenticated, adjacent attacker can exploit this, via     specially crafted broadcast mode NTP packets, to cause     ntpd to reject packets from a legitimate NTP broadcast     server. (CVE-2016-7428)

  - A denial of service vulnerability exists when receiving     server responses on sockets that correspond to different     interfaces than what were used in the request. An     unauthenticated, remote attacker can exploit this, by     sending repeated requests using specially crafted     packets with spoofed source addresses, to cause ntpd     to select the incorrect interface for the source, which     prevents it from sending new requests until the     interface list is refreshed. This eventually results in     preventing ntpd from synchronizing with the source.
    (CVE-2016-7429)

  - A flaw exists that allows packets with an origin     timestamp of zero to bypass security checks. An     unauthenticated, remote attacker can exploit this to     spoof arbitrary content. (CVE-2016-7431)

  - A flaw exists due to the root delay being included     twice, which may result in the jitter value being higher     than expected. An unauthenticated, remote attacker can     exploit this to cause a denial of service condition.
    (CVE-2016-7433)

  - A denial of service vulnerability exists when handling     specially crafted mrulist query packets that allows an     unauthenticated, remote attacker to crash ntpd.
    (CVE-2016-7434)

  - A flaw exists in the control mode (mode 6) functionality     when handling specially crafted control mode packets. An     unauthenticated, adjacent attacker can exploit this to     set or disable ntpd traps, resulting in the disclosure     of potentially sensitive information, disabling of     legitimate monitoring, or DDoS amplification.
    (CVE-2016-9310)

  - A NULL pointer dereference flaw exists in the     report_event() function within file ntpd/ntp_control.c     when the trap service handles certain peer events. An     unauthenticated, remote attacker can exploit this, via     a specially crafted packet, to cause a denial of service     condition. (CVE-2016-9311)

  - A denial of service vulnerability exists when handling     oversize UDP packets that allows an unauthenticated,     remote attacker to crash ntpd. Note that this     vulnerability only affects Windows versions.
    (CVE-2016-9312)

According to its self-reported version number, the remote pfSense install is affected by multiple vulnerabilities as stated in the referenced vendor advisories.

New ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

Network Time Foundation reports :

NTF's NTP Project is releasing ntp-4.2.8p9, which addresses :

- 1 HIGH severity vulnerability that only affects Windows

- 2 MEDIUM severity vulnerabilities

- 2 MEDIUM/LOW severity vulnerabilities

- 5 LOW severity vulnerabilities

- 28 other non-security fixes and improvements

All of the security issues in this release are listed in VU#633847.

ID	Name	Product	Family	Published	Updated	Severity
95575	Network Time Protocol Daemon (ntpd) 4.x < 4.2.8p9 Multiple Vulnerabilities	Nessus	Misc.	12/6/2016	4/27/2020	low
106503	pfSense < 2.3.3 Multiple Vulnerabilities (SA-17_01 - SA-17_03)	Nessus	Firewalls	1/31/2018	11/8/2019	critical
95028	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : ntp (SSA:2016-326-01)	Nessus	Slackware Local Security Checks	11/22/2016	1/14/2021	high
95265	FreeBSD : ntp -- multiple vulnerabilities (8db8d62a-b08b-11e6-8eba-d050996490d0)	Nessus	FreeBSD Local Security Checks	11/23/2016	1/4/2021	high

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