CVE-2016-1547

ntp: crypto-NAK preemptable association denial of service

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

Un atacante fuera de ruta puede provocar que una asociación de clientes preventiva sea desmovilizada en NTP 4.2.8p4 y versiones anteriores y NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 enviando un paquete NAK encriptado a un cliente víctima con una dirección fuente suplantada de un asociado existente. Esto es cierto incluso si la autenticación está habilitada.

A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-01-07 CVE Reserved
2016-05-02 CVE Published
2024-06-18 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (17)

URL	Tag	Source
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html	X_refsource_confirm
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html	X_refsource_confirm
http://www.securityfocus.com/bid/88276	Vdb Entry
http://www.securitytracker.com/id/1035705	Vdb Entry
http://www.talosintelligence.com/reports/TALOS-2016-0081	Mitigation
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf	X_refsource_confirm
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf	X_refsource_confirm
https://security.netapp.com/advisory/ntap-20171004-0002	X_refsource_confirm
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11	X_refsource_confirm
https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19	X_refsource_misc

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2016-1552.html	2021-11-17
http://www.debian.org/security/2016/dsa-3629	2021-11-17
https://access.redhat.com/errata/RHSA-2016:1141	2021-11-17
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc	2021-11-17
https://security.gentoo.org/glsa/201607-15	2021-11-17
https://access.redhat.com/security/cve/CVE-2016-1547	2016-08-03
https://bugzilla.redhat.com/show_bug.cgi?id=1331461	2016-08-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ntp Search vendor "Ntp"		Ntp Search vendor "Ntp" for product "Ntp"				<= 4.2.8 Search vendor "Ntp" for product "Ntp" and version " <= 4.2.8"		p4		Affected