Vulnerability in ntp (DEBIAN-CVE-2016-0727)

Summary

Vulnerability in ntp (DEBIAN-CVE-2016-0727). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1:4.2.8p9+dfsg-2 or later.

Original description

The description as published by the source.

The crontab script in the ntp package before 1:4.2.6.p3+dfsg-1ubuntu3.11 on Ubuntu 12.04 LTS, before 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 on Ubuntu 14.04 LTS, on Ubuntu Wily, and before 1:4.2.8p4+dfsg-3ubuntu5.3 on Ubuntu 16.04 LTS allows local users with access to the ntp account to write to arbitrary files and consequently gain privileges via vectors involving statistics directory cleanup.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as DEBIAN-CVE-2016-0727 has been found in ntp.
Successful exploitation can lead to full system takeover.
What to do: upgrade ntp to 1:4.2.8p9+dfsg-2 or later.
If unsure, ask your IT team or search "ntp DEBIAN-CVE-2016-0727" on the vendor's site.

DEBIAN-CVE-2016-0727 (ntp)
Attack vector: local / no user interaction
Patched: 1:4.2.8p9+dfsg-2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in ntp.

📍 Affected scope

Check the vendor advisory for the affected versions of ntp.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1:4.2.8p9+dfsg-2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'ntp' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'ntp' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で ntp を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade ntp to 1:4.2.8p9+dfsg-2
```
ステージング環境で 1:4.2.8p9+dfsg-2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Debian:11 ntp

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.8p9+dfsg-2"}]}]

References

advisory security-tracker.debian.org