Flowable RCE Vulnerability Analysis & Fix

Vulnerability Overview Vulnerability Type: Remote Code Execution (RCE) Affected Component: Flowable workflow engine (flowable-engine) Risk Level: High (arbitrary code execution is possible) Scope of Impact Affected Versions: Flowable 5.x and 6.x series (specific versions need to be confirmed in conjunction with the CVE number, such as CVE-2023-2923, etc.) Trigger Condition: An attacker, by crafting a malicious request (e.g., specific parameters or expressions), leverages the expression parser (such as JUEL/SpEL) to achieve code execution. Remediation Upgraded Version: Upgrade to the officially released fixed version (e.g., 6.8.0+ or 7.0.0+, depending on the specific CVE). Temporary Mitigation: - Restrict access to the Flowable REST API (e.g., via firewall or gateway authentication). - Disable or restrict the parsing capabilities of the Expression Language (e.g., configure ). - Perform strict validation and filtering of input parameters. POC / Exploit Code ```java // Example: Trigger RCE via REST API (using CVE-2023-2923 as an example) // Request example (curl): curl -X POST "http://:/api/process-definition" \ -H "Content-Type: application/json" \ -d '{ "name": "test", "key": "test", "description": "test", "tenantId": "", "category": "test", "diagram": "test", "startFormKey": "test", "startFormFields": [], "startFormLayout": "test", "startFormTitle": "test", "startFormDescription": "test", "startFormIcon": "test", "startFormColor": "test", "startFormBackground": "test", "startFormFont": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFontColor": "test", "startFormFontStyle": "test", "startFormFontWeight": "test", "startFormFontFamily": "test", "startFormFontStretch": "test", "startFormFontVariant": "test", "startFormFontSize": "test", "startFormFo

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Flowable RCE Vulnerability Analysis & Fix

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