Vulnerability in qemu (UBUNTU-CVE-2020-29443)

Summary

vulnerability in qemu (UBUNTU-CVE-2020-29443). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `2.0.0+dfsg-2ubuntu1.47+esm6` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2020-29443** has been found in qemu. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade qemu to **2.0.0+dfsg-2ubuntu1.47+esm6** or later. If unsure, ask your IT team or search "qemu UBUNTU-CVE-2020-29443" on the vendor's site.

UBUNTU-CVE-2020-29443 (qemu) — Attack vector: local / no user interaction Patched: `2.0.0+dfsg-2ubuntu1.47+esm6` — 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 qemu.

📍 Affected scope

qemu — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **2.0.0+dfsg-2ubuntu1.47+esm6**.

🛡️ 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 'qemu' .` 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 'qemu' . | 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 `qemu` 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 qemu to 2.0.0+dfsg-2ubuntu1.47+esm6
```
ステージング環境で 2.0.0+dfsg-2ubuntu1.47+esm6 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 qemu

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0+dfsg-2ubuntu1.47+esm6"}]}]

Ubuntu:16.04:LTS qemu

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.5+dfsg-5ubuntu10.49"}]}]

Ubuntu:18.04:LTS qemu

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.11+dfsg-1ubuntu7.35"}]}]

Ubuntu:20.04:LTS qemu

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2-3ubuntu6.12"}]}]

References

advisory https://ubuntu.com/security/notices/USN-4725-1
advisory https://ubuntu.com/security/notices/USN-5010-1
advisory https://ubuntu.com/security/notices/USN-8412-1
report https://ubuntu.com/security/CVE-2020-29443
report https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg04255.html
report https://www.openwall.com/lists/oss-security/2021/01/18/2
report https://www.cve.org/CVERecord?id=CVE-2020-29443