CVE-2016-4955

medium

Description

ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

References

Advisories
More

https://security.gentoo.org/glsa/201607-15

https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc

https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf

http://www.securitytracker.com/id/1036037

http://www.securityfocus.com/bid/91007

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

http://www.kb.cert.org/vuls/id/321640

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html

https://www.kb.cert.org/vuls/id/321640

https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX/

http://www.ubuntu.com/usn/USN-3096-1

http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded

http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded

http://www.securityfocus.com/archive/1/538600/100/0/threaded

http://www.securityfocus.com/archive/1/538599/100/0/threaded

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd

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

http://support.ntp.org/bin/view/Main/NtpBug3043

http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html

http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.html

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html

http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html

http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html

http://bugs.ntp.org/3043

Details

Source: Mitre, NVD

Published: 2016-07-05

Updated: 2025-04-12

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: Medium

EPSS

EPSS: 0.08768