Path Traversal in sulu/sulu (CVE-2021-43836)
Summary
Path traversal in sulu/sulu (CVE-2021-43836). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 2.4.0 or later.
Original description
The description as published by the source.
Sulu is an open-source PHP content management system based on the Symfony framework. In affected versions an attacker can read arbitrary local files via a PHP file include. In a default configuration this also leads to remote code execution. The problem is patched with the Versions 1.6.44, 2.2.18, 2.3.8, 2.4.0. For users unable to upgrade overwrite the service sulu_route.generator.expression_token_provider and wrap the translator before passing it to the expression language.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory 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 CVE-2021-43836 has been found in sulu/sulu.
Successful exploitation can lead to full system takeover.
What to do: upgrade sulu/sulu to 2.4.0 or later.
If unsure, ask your IT team or search "sulu/sulu CVE-2021-43836" on the vendor's site.
CVE-2021-43836 (sulu/sulu) — CWE-22
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.4.0 — 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.
Path traversal (CWE-22) exists in sulu/sulu.
Check the vendor advisory for the affected versions of sulu/sulu.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 2.4.0.
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 'sulu/sulu' . 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
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1Identify exposure identify
grep -r 'sulu/sulu' . | 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
sulu/sulu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 sulu/sulu to 2.4.0ステージング環境で 2.4.0 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。
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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 github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com