Description
The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.
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 18.04 LTS | ntp | 1:4.2.8p10+dfsg-5ubuntu7.1 | USN-3707-1 |
| Ubuntu 16.04 LTS | ntp | 1:4.2.8p4+dfsg-3ubuntu5.9 | USN-3707-1 |
| Ubuntu 14.04 LTS | ntp | 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13 | USN-3707-1 |
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 | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
| SLES 12 | ntp | 4.2.8p11-46.26.2 | SUSE-SU-2018:1464-1 |
| SLES 11 SP4 | ntp | 4.2.8p11-64.4.1 | SUSE-SU-2018:0808-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p11-64.4.1 | SUSE-SU-2018:0808-1 |
| SUSE OpenStack Cloud 7 | ntp | 4.2.8p11-64.5.1 | SUSE-SU-2018:1765-1 |
| 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 | 4.2.8p15-7.2 | openSUSE-SU-2024:11102-1 |
Advisories 8
- USN-3707-1 ntp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 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
- 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-2018:0808-1 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://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html
- GLSA-201805-12 vendor-advisory
- FreeBSD-SA-18:02 vendor-advisory
- USN-3707-2 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180626-0001/
- 103339 vdb-entry
- 20180301 [Newsletter/Marketing] [slackware-security] ntp (SSA:2018-060-02) mailing-list
- http://support.ntp.org/bin/view/Main/NtpBug3454
- USN-3707-1 vendor-advisory
- https://www.synology.com/support/security/Synology_SA_18_13
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us