Vulnerability in libvirt
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 UBUNTU-CVE-2020-25637 has been found in libvirt.
Successful exploitation can lead to full system takeover.
What to do: upgrade libvirt to 4.0.0-1ubuntu8.21 or later.
If unsure, ask your IT team or search "libvirt UBUNTU-CVE-2020-25637" on the vendor's site.
UBUNTU-CVE-2020-25637 (libvirt)
Attack vector: local / no user interaction
Patched: 4.0.0-1ubuntu8.21 — 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.
A vulnerability (unclassified) exists in libvirt.
Check the vendor advisory for the affected versions of libvirt.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 4.0.0-1ubuntu8.21.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'libvirt' . 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 exposureidentify
grep -r 'libvirt' . | 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
libvirt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 patchpatch
Upgrade libvirt to 4.0.0-1ubuntu8.21ステージング環境で 4.0.0-1ubuntu8.21 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 verificationverify
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
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Ubuntu:Pro:14.04:LTS | libvirt |
All versions |
— |
| Ubuntu:Pro:16.04:LTS | libvirt |
All versions |
— |
| Ubuntu:18.04:LTS | libvirt |
< 4.0.0-1ubuntu8.21 |
4.0.0-1ubuntu8.21 |
| Ubuntu:20.04:LTS | libvirt |
< 6.0.0-0ubuntu8.16 |
6.0.0-0ubuntu8.16 |
Original description The description as published by the source.
A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org