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UBUNTU-CVE-2016-9841

Vulnerability in klibc (UBUNTU-CVE-2016-9841)

Summary

vulnerability in klibc (UBUNTU-CVE-2016-9841). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `2.0.3-0ubuntu1.14.04.3+esm3` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2016-9841** has been found in klibc. Successful exploitation can lead to full system takeover. CVSS score: ?/10. What to do: upgrade klibc to **2.0.3-0ubuntu1.14.04.3+esm3** or later. If unsure, ask your IT team or search "klibc UBUNTU-CVE-2016-9841" on the vendor's site.

UBUNTU-CVE-2016-9841 (klibc) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `2.0.3-0ubuntu1.14.04.3+esm3` — 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 klibc.

📍 Affected scope

klibc — .

🔥 Severity

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

🔧 How to fix

Update to **2.0.3-0ubuntu1.14.04.3+esm3**.

🛡️ 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 'klibc' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

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

1
Identify exposure identify
```
grep -r 'klibc' . | 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 `klibc` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade klibc to 2.0.3-0ubuntu1.14.04.3+esm3
```
ステージング環境で 2.0.3-0ubuntu1.14.04.3+esm3 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
7
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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

Ubuntu:Pro:14.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-0ubuntu1.14.04.3+esm3"}]}]

Ubuntu:Pro:14.04:LTS zlib

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:16.04:LTS rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.1-3ubuntu1.3"}]}]

Ubuntu:16.04:LTS zlib

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.2.8.dfsg-2ubuntu4.3"}]}]

Ubuntu:Pro:16.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4-8ubuntu1.16.04.4+esm2"}]}]

Ubuntu:16.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:18.04:LTS rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.2-2.1ubuntu1.1"}]}]

Ubuntu:Pro:18.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4-9ubuntu2.2+esm1"}]}]

Ubuntu:18.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:20.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.7-1ubuntu5.2"}]}]

Ubuntu:20.04:LTS rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.3-6"}]}]

Ubuntu:20.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:22.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.10-4ubuntu0.1"}]}]

Ubuntu:22.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:24.04:LTS klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.13-4ubuntu0.1"}]}]

Ubuntu:24.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 klibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.13-4ubuntu1"}]}]

Ubuntu:25.10 zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS zsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory https://ubuntu.com/security/notices/USN-4246-1
advisory https://ubuntu.com/security/notices/USN-4292-1
advisory https://ubuntu.com/security/notices/USN-6736-1
advisory https://ubuntu.com/security/notices/USN-6736-2
report https://ubuntu.com/security/CVE-2016-9841
report http://www.openwall.com/lists/oss-security/2016/12/05/21
report https://www.cve.org/CVERecord?id=CVE-2016-9841

Summary

AI summary snake-internal / snake-material-v2

Response Actions (7 steps)

Affected packages

References

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