Description
The MATCH_ASSOC function in NTP before version 4.2.8p9 and 4.3.x before 4.3.92 allows remote attackers to cause an out-of-bounds reference via an addpeer request with a large hmode value.
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 | — |
| Debian 8 | ntp | 1:4.2.6.p5+dfsg-7+deb8u2 | DSA-3629-1 |
| Debian 7 | ntp | 1:4.2.6.p5+dfsg-2+deb7u7 | DLA-559-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ntp | 1:4.2.8p4+dfsg-3ubuntu5.3 | USN-3096-1 |
| Ubuntu 14.04 LTS | ntp | 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 | USN-3096-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ntp +4 | 4.2.6p5-22.el7_2.2 | RHSA-2016:1141 |
| RHEL 6 | ntp +3 | 4.2.6p5-10.el6.1 | RHSA-2016:1141 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6.7 EUS | ntp +3 | 4.2.6p5-5.el6_7.5 | RHSA-2016:1552 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1291-1 |
| SLES 12 | ntp | 4.2.8p8-46.8.1 | SUSE-SU-2016:1568-1 |
| SLES 11 SP4 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1278-1 |
| 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 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | ntp | 4.2.8p7-11.1 | 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-2016:1278-1 |
| 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 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p9-1.1 | openSUSE-SU-2024:10181-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ntp +4 | 4.2.6p5-22.el7_2.2 | ELSA-2016-1141 |
Advisories 14
- RHSA-2016:1141 Red Hat Security Advisory: ntp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2016:1552 Red Hat Security Advisory: ntp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-559-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3629-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3096-1 ntp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 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-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
- ICSA-21-159-11 Siemens SIMATIC NET CP 443-1 OPC UA CISA ICS & IT advisories · May 6, 2025
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
- SSA-211752 SSA-211752: Multiple NTP-Client Related Vulnerabilities in SIMATIC CP 443-1 OPC UA Siemens ProductCERT · Feb 8, 2022
- ELSA-2016-1141 Moderate: ntp security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 31, 2016
References
- USN-3096-1 vendor-advisory
- DSA-3629 vendor-advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://support.ntp.org/bin/view/Main/NtpBug3009
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- RHSA-2016:1141 vendor-advisory
- SUSE-SU-2016:1912 vendor-advisory
- VU#718152 third-party-advisory
- RHSA-2016:1552 vendor-advisory
- 1035705 vdb-entry
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- https://security.netapp.com/advisory/ntap-20171004-0002/
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_ntp_4_2_8p7_Security
- 20160428 Multiple Vulnerabilities in Network Time Protocol Daemon Affecting Cisco Products: April 2016 vendor-advisory
- FreeBSD-SA-16:16 vendor-advisory
- SUSE-SU-2016:2094 vendor-advisory
- 88226 vdb-entry
- openSUSE-SU-2016:1423 vendor-advisory
- GLSA-201607-15 vendor-advisory
- openSUSE-SU-2016:1329 vendor-advisory
- http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html
- SUSE-SU-2016:1471 vendor-advisory
- FEDORA-2016-5b2eb0bf9c vendor-advisory
- SUSE-SU-2016:1291 vendor-advisory
- DSA-3629 vendor-advisory
- 20160429 [slackware-security] ntp (SSA:2016-120-01) mailing-list
- https://support.f5.com/csp/article/K20804323
- SUSE-SU-2016:1568 vendor-advisory
- 20160429 [slackware-security] ntp (SSA:2016-120-01) mailing-list
- SUSE-SU-2016:1278 vendor-advisory
- FEDORA-2016-ed8c6c0426 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11