CVE-2016-4954

high-risk

Published 2016-07-05

The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.

Do I need to act?

2.9% 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

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (20)

Ntp

Solaris

Manager

Manager Proxy

Opensuse

Linux Enterprise Desktop

Ntp

Affected Vendors

Ntp Oracle Opensuse Suse Siemens

References (70)

Issue Tracking http://bugs.ntp.org/3044

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...

http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA...

Patch http://support.ntp.org/bin/view/Main/NtpBug3044

Vendor Advisory 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

and 50 more references

/ 100

high-risk

Severity 26/34 · High

Exploitability 6/34 · Minimal

Exposure 24/34 · High