CVE-2016-4954

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 13.07% Top 10%
Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory FreeBSD.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory cisco.com Vendor Advisory opensuse.org Vendor Advisory ntp.org Vendor Advisory ntp.org Vendor Advisory ntp.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html mailing list third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-3096-1 vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/ vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html mailing list third party advisory vendor advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/ vendor advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us third party advisory
http://www.securitytracker.com/id/1036037 vdb entry third party advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html mailing list third party advisory vendor advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html third party advisory
http://support.ntp.org/bin/view/Main/NtpBug3044 patch vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html vendor advisory
http://www.kb.cert.org/vuls/id/321640 third party advisory us government resource
http://support.ntp.org/bin/view/Main/SecurityNotice vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX/ vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html mailing list third party advisory vendor advisory
http://bugs.ntp.org/3044 issue tracking vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html mailing list third party advisory vendor advisory
https://security.gentoo.org/glsa/201607-15 third party advisory vendor advisory
http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.html
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd vendor advisory
http://www.securityfocus.com/archive/1/540683/100/0/threaded mailing list
http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html vendor advisory
http://www.securityfocus.com/archive/1/538599/100/0/threaded mailing list
http://www.securityfocus.com/archive/1/archive/1/540683/100/0/threaded mailing list
http://www.securityfocus.com/archive/1/538600/100/0/threaded mailing list
https://www.kb.cert.org/vuls/id/321640 third party advisory
http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded mailing list
http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded mailing list
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf third party advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11 third party advisory us government resource
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf third party advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11

Frequently Asked Questions

What is the severity of CVE-2016-4954?
CVE-2016-4954 has been scored as a high severity vulnerability.
How to fix CVE-2016-4954?
To fix CVE-2016-4954, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-4954 being actively exploited in the wild?
It is possible that CVE-2016-4954 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~13% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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