Description
ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.
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 | 1:4.2.8p11+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ntp | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | ntp | No fix yet | — |
| Ubuntu Pro 14.04 LTS | ntp | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | ntp | 4.2.8p12-4.3.2 | SUSE-SU-2018:3386-1 |
| SLES 12 SP3 | ntp | 4.2.8p11-64.3.2 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1, SUSE-SU-2018:0956-1 |
| SLES 12 SP2 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-2, SUSE-SU-2018:1765-1 |
| SLES 12 SP1 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1 |
| SLES 12 | ntp | 4.2.8p11-46.26.2 | SUSE-SU-2018:3351-1, SUSE-SU-2018:1464-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | ntp | 4.2.8p11-64.4.1 | SUSE-SU-2018:3352-1, SUSE-SU-2018:0808-1 |
| SLES 11 SP3 | ntp | 4.2.8p12-48.21.1 | SUSE-SU-2018:3356-1 |
| SLES for SAP 12 SP3 | ntp | 4.2.8p11-64.3.2 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1, SUSE-SU-2018:0956-1 |
| SLES for SAP 12 SP2 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1 |
| SLES for SAP 12 SP1 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-2, SUSE-SU-2018:1765-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p11-64.4.1 | SUSE-SU-2018:3352-1, SUSE-SU-2018:0808-1 |
| SUSE OpenStack Cloud 7 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | ntp | 4.2.8p12-48.21.1 | SUSE-SU-2018:3356-1 |
| SUSE Enterprise Storage 4 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:3342-1, SUSE-SU-2018:1765-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p15-7.2 | openSUSE-SU-2024:11102-1 |
Advisories 12
- SUSE-SU-2018:3352-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- 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-2018:3356-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3386-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11102-1 ntp-4.2.8p15-7.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1765-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3342-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3342-2 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-2018:3351-1 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
References
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html
- GLSA-201805-12 vendor-advisory
- FreeBSD-SA-18:02 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180626-0001/
- 20180301 [Newsletter/Marketing] [slackware-security] ntp (SSA:2018-060-02) mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214
- http://support.ntp.org/bin/view/Main/NtpBug3415
- https://www.synology.com/support/security/Synology_SA_18_13
- 103194 vdb-entry
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us