CVE-2016-4956

moderate-risk
Published 2016-07-05

ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (interleaved-mode transition and time change) via a spoofed broadcast packet. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-1548.

Do I need to act?

~
1.1% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (20)

Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Suse Manager
Ntp
Ntp
Ntp
Ntp

Affected Vendors

Ntp Oracle Opensuse Novell Suse Siemens

References (66)

Issue Tracking http://bugs.ntp.org/3042
Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Upda...
Vendor Advisory http://support.ntp.org/bin/view/Main/NtpBug3042
Release Notes http://support.ntp.org/bin/view/Main/SecurityNotice
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20...
Third Party Advisory http://www.kb.cert.org/vuls/id/321640
Third Party Advisory http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securityfocus.com/archive/1/538599/100/0/threaded
http://www.securityfocus.com/archive/1/538600/100/0/threaded
http://www.securityfocus.com/archive/1/540683/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded
and 46 more references
47
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 3/34 · Minimal
Exposure 23/34 · High