Description
A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NTP Project | NTP | 4.2.8p3, 4.2.8p4 | — |
| NTPsec Project | NTPSec | 3e160db8dc248a0bcb053b56a80167dc742d2b74, a5fb34b9cc89b92a8fef2f459004865c93bb7f92 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 11 | ntp | 1:4.2.8p7+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ntp | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | ntp | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | ntp | 4.2.8p11-64.3.2 | SUSE-SU-2018:1765-1, SUSE-SU-2018:0956-1 |
| SLES 12 SP2 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-2, SUSE-SU-2018:1765-1 |
| SLES 12 SP1 | ntp | 4.2.8p7-11.1 | SUSE-SU-2018:1765-1, SUSE-SU-2016:1291-1 |
| SLES 12 | ntp | 4.2.8p8-46.8.1 | SUSE-SU-2018:1464-1, SUSE-SU-2016:1568-1 |
| SLES 11 SP4 | ntp | 4.2.8p7-11.1 | SUSE-SU-2018:0808-1, SUSE-SU-2016:1278-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SLES 11 SP2 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SLES for SAP 12 SP3 | ntp | 4.2.8p11-64.3.2 | SUSE-SU-2018:1765-1, SUSE-SU-2018:0956-1 |
| SLES for SAP 12 SP2 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
| SLES for SAP 12 SP1 | ntp | 4.2.8p7-11.1 | SUSE-SU-2018:1765-1, SUSE-SU-2016:1291-1 |
| SLES for SAP 12 | ntp | 4.2.8p8-46.8.1 | SUSE-SU-2016:1568-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p7-11.1 | SUSE-SU-2018:0808-1, SUSE-SU-2016:1278-1 |
| SUSE OpenStack Cloud 7 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
| SUSE OpenStack Cloud 5 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SUSE Manager Proxy 2.1 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SUSE Manager 2.1 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SUSE Enterprise Storage 4 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p9-1.1 | openSUSE-SU-2024:10181-1 |
Advisories 11
- SUSE-SU-2018:1765-2 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0956-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1765-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10181-1 ntp-4.2.8p9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1471-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0808-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1568-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1291-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1278-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1464-1 Security update for ntp SUSE / openSUSE Security Updates · May 2, 2025
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
References
- http://www.talosintelligence.com/reports/TALOS-2016-0083/
- 88200 vdb-entry
- 1035705 vdb-entry
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- https://security.netapp.com/advisory/ntap-20171004-0002/
- FreeBSD-SA-16:16 vendor-advisory
- https://www.synology.com/support/security/Synology_SA_18_13
- GLSA-201607-15 vendor-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us