CVE-2016-4956
MEDIUMCVSS 5.3/10EPSS 16.05%
Last modified
CVE-2016-4956 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 16.05% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Ntp | Ntp | >= 4.2.0, < 4.2.8 | — |
| Ntp | Ntp | >= 4.3.0, < 4.3.93 | — |
| Ntp | Ntp | 4.2.8 | — |
| Oracle | Solaris | 10 | — |
| Oracle | Solaris | 11.3 | — |
| Suse | Manager Proxy | 2.1 | — |
| Suse | Openstack Cloud | 5 | — |
| Novell | Suse Manager | 2.1 | — |
| Opensuse | Leap | 42.1 | — |
| Opensuse | Opensuse | 13.2 | — |
| Suse | Linux Enterprise Desktop | 12 | Sp1 |
| Suse | Linux Enterprise Server | 11 | Sp2 |
| Suse | Linux Enterprise Server | 12 | Sp1 |
| Siemens | Simatic Net Cp 443-1 Opc Ua Firmware | All versions | — |
References
- http://bugs.ntp.org/3042Issue Tracking, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlMailing List, Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3042Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNoticeRelease Notes, Vendor Advisory
- http://www.kb.cert.org/vuls/id/321640Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
- http://www.securityfocus.com/bid/91009Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036037Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdfThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201607-15Third Party Advisory
- http://bugs.ntp.org/3042Issue Tracking, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlMailing List, Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3042Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNoticeRelease Notes, Vendor Advisory
- http://www.kb.cert.org/vuls/id/321640Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
- http://www.securityfocus.com/bid/91009Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036037Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdfThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201607-15Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-4956?
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.
How severe is CVE-2016-4956?
CVE-2016-4956 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 16.05% probability of exploitation in the next 30 days.
How do I fix CVE-2016-4956?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2016-4956?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST