CVE-2016-4955
medium
CVSS v3
5.9
CVSS v4 NEW
—
VIR risk
5.9
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.
Predictions
Exploit likelihood
69%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| suse | 42.1 | affected | |
| suse | 13.2 | affected | |
| suse | 12 | affected | |
| suse | 11 | affected | |
| debian | bullseye | fixed | 1:4.2.8p8+dfsg-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| ntp | ntp | {"startIncluding":"4.2.0","endExcluding":"4.2.8"} | 4.2.8 |
| ntp | ntp | 4.2.8 | |
| suse | manager_proxy | 2.1 | |
| suse | openstack_cloud | 5 | |
References
- https://www.suse.com/security/cve/CVE-2016-4955.html
- http://bugs.ntp.org/3043
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
- 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-Updates.html
- http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html
- http://support.ntp.org/bin/view/Main/NtpBug3043
- http://support.ntp.org/bin/view/Main/SecurityNotice
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd
- http://www.kb.cert.org/vuls/id/321640
- 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/archive/1/538599/100/0/threaded
- http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded
- http://www.securityfocus.com/bid/91007
- http://www.securitytracker.com/id/1036037
- http://www.ubuntu.com/usn/USN-3096-1
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
CWEs
CWE-362
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.