Vulnerability in ubuntu-advantage-tools (UBUNTU-CVE-2026-12391)
Summary
Vulnerability in ubuntu-advantage-tools (UBUNTU-CVE-2026-12391). Confidential information can be exposed externally. Mitigation: upgrade to 37.2ubuntu~22.04.1 or later.
Original description
The description as published by the source.
An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.
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 UBUNTU-CVE-2026-12391 has been found in ubuntu-advantage-tools.
Confidential information can be exposed externally.
What to do: upgrade ubuntu-advantage-tools to 37.2ubuntu~22.04.1 or later.
If unsure, ask your IT team or search "ubuntu-advantage-tools UBUNTU-CVE-2026-12391" on the vendor's site.
UBUNTU-CVE-2026-12391 (ubuntu-advantage-tools)
Attack vector: local
Patched: 37.2ubuntu~22.04.1 — 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.
A vulnerability (unclassified) exists in ubuntu-advantage-tools.
Check the vendor advisory for the affected versions of ubuntu-advantage-tools.
Severity: ?. Confidential information can be exposed externally.
Update to 37.2ubuntu~22.04.1.
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 'ubuntu-advantage-tools' . 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
-
1Identify exposure identify
grep -r 'ubuntu-advantage-tools' . | 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
ubuntu-advantage-toolsを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade ubuntu-advantage-tools to 37.2ubuntu~22.04.1ステージング環境で 37.2ubuntu~22.04.1 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。
-
3Post-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
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org