[pitboss] phase 13: Track L.11 — Express / Koa / NestJS / Fastify adapters

tests/dynamic_fixtures/js_frameworks/express/benign.js

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+// Phase 13 (Track L.11) — Express CMDI benign fixture.
+//
+// The `/run` route accepts a `cmd` query parameter but rejects
+// everything outside an allowlist before invoking `child_process.exec`
+// with a fixed argv, so the sink call is unreachable for
+// attacker-controlled values.
+
+const express = require('express');
+const { execFile } = require('child_process');
+
+const app = express();
+
+const ALLOW = new Set(['status', 'uptime', 'version']);
+
+function runCmd(req, res) {
+    const cmd = req.query.cmd || '';
+    if (!ALLOW.has(cmd)) {
+        return res.status(400).send('rejected');
+    }
+    execFile('/usr/bin/echo', [cmd], (err, stdout) => {
+        if (err) return res.status(500).send(String(err));
+        res.send(stdout);
+    });
+}
+
+app.get('/run', runCmd);
+
+module.exports = { app, runCmd };

tests/dynamic_fixtures/js_frameworks/express/vuln.js

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+// Phase 13 (Track L.11) — Express CMDI vuln fixture.
+//
+// The `/run` route forwards a `cmd` query parameter straight into
+// `child_process.exec`, so any attacker who reaches the route can
+// execute arbitrary shell.  Adapter binding:
+// `app.get('/run', runCmd)` with `cmd` flowing through `req.query.cmd`.
+
+const express = require('express');
+const { exec } = require('child_process');
+
+const app = express();
+
+function runCmd(req, res) {
+    const cmd = req.query.cmd || '';
+    exec(cmd, (err, stdout) => {
+        if (err) return res.status(500).send(String(err));
+        res.send(stdout);
+    });
+}
+
+app.get('/run', runCmd);
+
+module.exports = { app, runCmd };