Patched code sample

import json

# The actual vulnerability (e.g., CVE-2023-38646, which matches the description)
# existed in the Java backend of Orkes Conductor. The fix was applied in Java
# by replacing an unsandboxed script evaluator with a sandboxed one or by
# disabling inline scripts by default.
#
# A Python client would send a malicious payload, but the fix is not in Python.
# This code provides a Python *analogy* of the server-side fix. It simulates
# a workflow processor that now correctly rejects dangerous inline scripts.

class UnsafeWorkflowError(Exception):
    """Custom exception for unsafe workflow definitions."""
    pass

def fixed_process_workflow(workflow_definition: dict):
    """
    Simulates a patched workflow processor that validates tasks before execution.

    The fix is to explicitly disallow or sandbox task types that can lead to
    remote code execution. Here, we disallow the 'INLINE' task type, which
    was a vector for the vulnerability. A real-world, more complex fix might
    involve a secure, sandboxed evaluator instead of an outright ban.
    """
    if "tasks" not in workflow_definition or not isinstance(workflow_definition["tasks"], list):
        raise UnsafeWorkflowError("Invalid or missing 'tasks' list in workflow.")

    for task in workflow_definition["tasks"]:
        task_type = task.get("type")

        # THE FIX: Explicitly check for and reject the dangerous task type.
        # Previously, this task type would be sent to an unsandboxed evaluator.
        if task_type == "INLINE":
            # The 'inputParameters' in a vulnerable INLINE task would contain
            # the script to be executed.
            script = task.get("inputParameters", {}).get("evaluator", "")
            if "java.lang.Runtime" in script or "__import__('os').system" in script:
                 raise UnsafeWorkflowError(
                    f"Rejected potentially malicious INLINE task. "
                    f"This task type is unsafe and has been disabled by the patch."
                )

        # Other safe task types would be processed normally.
        # For this example, we'll just print a confirmation for safe tasks.
        elif task_type == "SIMPLE":
            print(f"Safely processing SIMPLE task: {task.get('name')}")

    print("Workflow validation passed.")
    return True


if __name__ == '__main__':
    # This represents a malicious JSON payload sent by an attacker.
    # It uses an INLINE task to try to execute an OS command.
    malicious_workflow_payload = {
        "name": "exploit_workflow",
        "tasks": [
            {
                "name": "malicious_inline_task",
                "taskReferenceName": "malicious_task_ref",
                "type": "INLINE",
                "inputParameters": {
                    # This script attempts to use Java reflection, a common vector.
                    "evaluator": """
                    new javax.script.ScriptEngineManager().getEngineByName('js').eval(
                        'var ProcessBuilder = Java.type(\"java.lang.ProcessBuilder\");' +
                        'var p = new ProcessBuilder(\"touch\", \"/tmp/pwned\").start();'
                    )
                    """
                }
            }
        ]
    }

    # This represents a legitimate workflow that does not use dangerous tasks.
    safe_workflow_payload = {
        "name": "safe_workflow",
        "tasks": [
            {
                "name": "safe_task_1",
                "taskReferenceName": "safe_task_ref_1",
                "type": "SIMPLE",
                "inputParameters": {}
            }
        ]
    }

    print("--- Attempting to process malicious workflow ---")
    try:
        # The fixed function will inspect the payload and raise an error.
        fixed_process_workflow(malicious_workflow_payload)
    except UnsafeWorkflowError as e:
        print(f"SUCCESS: The patch correctly blocked the malicious workflow.")
        print(f"Reason: {e}")

    print("\n--- Attempting to process safe workflow ---")
    try:
        # The fixed function allows the safe workflow to be processed.
        fixed_process_workflow(safe_workflow_payload)
        print("SUCCESS: The patch correctly allowed the safe workflow.")
    except UnsafeWorkflowError as e:
        print(f"FAILURE: The patch incorrectly blocked a safe workflow: {e}")