Vulnerability in ksh (DEBIAN-CVE-2019-14868)

Summary

Vulnerability in ksh (DEBIAN-CVE-2019-14868). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 2020.0.0-2.1 or later.

Original description

The description as published by the source.

In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.

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-2019-14868 has been found in ksh.
Successful exploitation can lead to full system takeover.
What to do: upgrade ksh to 2020.0.0-2.1 or later.
If unsure, ask your IT team or search "ksh DEBIAN-CVE-2019-14868" on the vendor's site.

DEBIAN-CVE-2019-14868 (ksh)
Attack vector: local / no user interaction
Patched: 2020.0.0-2.1 — 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 ksh.

📍 Affected scope

Check the vendor advisory for the affected versions of ksh.

🔥 Severity

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

🔧 How to fix

Update to 2020.0.0-2.1.

🛡️ 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 'ksh' . 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 'ksh' . | 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 ksh 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 ksh to 2020.0.0-2.1
```
ステージング環境で 2020.0.0-2.1 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 ksh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.0.0-2.1"}]}]

References

advisory security-tracker.debian.org