fix: Auth data exposed via /users/me endpoint ([GHSA-37mj-c2wf-cx96](https://github.com/parse-community/parse-server/security/advisories/GHSA-37mj-c2wf-cx96)) (#10278)

spec/vulnerabilities.spec.js

@@ -4497,4 +4497,107 @@ describe('(GHSA-p2w6-rmh7-w8q3) SQL Injection via aggregate and distinct field n
       expect(response.data?.results).toEqual(['Alice']);
     });
   });
+
+  describe('(GHSA-37mj-c2wf-cx96) /users/me leaks raw authData via master context', () => {
+    const headers = {
+      'X-Parse-Application-Id': 'test',
+      'X-Parse-REST-API-Key': 'rest',
+      'Content-Type': 'application/json',
+    };
+
+    it('does not leak raw MFA authData via /users/me', async () => {
+      await reconfigureServer({
+        auth: {
+          mfa: {
+            enabled: true,
+            options: ['TOTP'],
+            algorithm: 'SHA1',
+            digits: 6,
+            period: 30,
+          },
+        },
+      });
+      const user = await Parse.User.signUp('username', 'password');
+      const sessionToken = user.getSessionToken();
+      const OTPAuth = require('otpauth');
+      const secret = new OTPAuth.Secret();
+      const totp = new OTPAuth.TOTP({
+        algorithm: 'SHA1',
+        digits: 6,
+        period: 30,
+        secret,
+      });
+      const token = totp.generate();
+      // Enable MFA
+      await user.save(
+        { authData: { mfa: { secret: secret.base32, token } } },
+        { sessionToken }
+      );
+      // Verify MFA data is stored (master key)
+      await user.fetch({ useMasterKey: true });
+      expect(user.get('authData').mfa.secret).toBe(secret.base32);
+      expect(user.get('authData').mfa.recovery).toBeDefined();
+      // GET /users/me should NOT include raw MFA data
+      const response = await request({
+        headers: {
+          ...headers,
+          'X-Parse-Session-Token': sessionToken,
+        },
+        method: 'GET',
+        url: 'http://localhost:8378/1/users/me',
+      });
+      expect(response.data.authData?.mfa?.secret).toBeUndefined();
+      expect(response.data.authData?.mfa?.recovery).toBeUndefined();
+      expect(response.data.authData?.mfa).toEqual({ status: 'enabled' });
+    });
+
+    it('returns same authData from /users/me and /users/:id', async () => {
+      await reconfigureServer({
+        auth: {
+          mfa: {
+            enabled: true,
+            options: ['TOTP'],
+            algorithm: 'SHA1',
+            digits: 6,
+            period: 30,
+          },
+        },
+      });
+      const user = await Parse.User.signUp('username', 'password');
+      const sessionToken = user.getSessionToken();
+      const OTPAuth = require('otpauth');
+      const secret = new OTPAuth.Secret();
+      const totp = new OTPAuth.TOTP({
+        algorithm: 'SHA1',
+        digits: 6,
+        period: 30,
+        secret,
+      });
+      await user.save(
+        { authData: { mfa: { secret: secret.base32, token: totp.generate() } } },
+        { sessionToken }
+      );
+      // Fetch via /users/me
+      const meResponse = await request({
+        headers: {
+          ...headers,
+          'X-Parse-Session-Token': sessionToken,
+        },
+        method: 'GET',
+        url: 'http://localhost:8378/1/users/me',
+      });
+      // Fetch via /users/:id
+      const idResponse = await request({
+        headers: {
+          ...headers,
+          'X-Parse-Session-Token': sessionToken,
+        },
+        method: 'GET',
+        url: `http://localhost:8378/1/users/${user.id}`,
+      });
+      // Both should return the same sanitized authData
+      expect(meResponse.data.authData).toEqual(idResponse.data.authData);
+      expect(meResponse.data.authData?.mfa).toEqual({ status: 'enabled' });
+    });
+  });
 });

src/Routers/UsersRouter.js

@@ -176,34 +176,50 @@ export class UsersRouter extends ClassesRouter {
     });
   }
 
-  handleMe(req) {
+  async handleMe(req) {
     if (!req.info || !req.info.sessionToken) {
       throw createSanitizedError(Parse.Error.INVALID_SESSION_TOKEN, 'Invalid session token', req.config);
     }
     const sessionToken = req.info.sessionToken;
-    return rest
-      .find(
-        req.config,
-        Auth.master(req.config),
-        '_Session',
-        { sessionToken },
-        { include: 'user' },
-        req.info.clientSDK,
-        req.info.context
-      )
-      .then(response => {
-        if (!response.results || response.results.length == 0 || !response.results[0].user) {
-          throw createSanitizedError(Parse.Error.INVALID_SESSION_TOKEN, 'Invalid session token', req.config);
-        } else {
-          const user = response.results[0].user;
-          // Send token back on the login, because SDKs expect that.
-          user.sessionToken = sessionToken;
-
-          // Remove hidden properties.
-          UsersRouter.removeHiddenProperties(user);
-          return { response: user };
-        }
-      });
+    // Query the session with master key to validate the session token,
+    // but do NOT include 'user' to avoid leaking user data via master context
+    const sessionResponse = await rest.find(
+      req.config,
+      Auth.master(req.config),
+      '_Session',
+      { sessionToken },
+      {},
+      req.info.clientSDK,
+      req.info.context
+    );
+    if (
+      !sessionResponse.results ||
+      sessionResponse.results.length == 0 ||
+      !sessionResponse.results[0].user
+    ) {
+      throw createSanitizedError(Parse.Error.INVALID_SESSION_TOKEN, 'Invalid session token', req.config);
+    }
+    const userId = sessionResponse.results[0].user.objectId;
+    // Re-fetch the user with the caller's auth context so that
+    // protectedFields, CLP, and auth adapter afterFind apply correctly
+    const userResponse = await rest.get(
+      req.config,
+      req.auth,
+      '_User',
+      userId,
+      {},
+      req.info.clientSDK,
+      req.info.context
+    );
+    if (!userResponse.results || userResponse.results.length == 0) {
+      throw createSanitizedError(Parse.Error.INVALID_SESSION_TOKEN, 'Invalid session token', req.config);
+    }
+    const user = userResponse.results[0];
+    // Send token back on the login, because SDKs expect that.
+    user.sessionToken = sessionToken;
+    // Remove hidden properties.
+    UsersRouter.removeHiddenProperties(user);
+    return { response: user };
   }
 
   async handleLogIn(req) {