CVE-2022-39225

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. In versions prior to 4.10.15, or 5.0.0 and above prior to 5.2.6, a user can write to the session object of another user if the session object ID is known. For example, an attacker can assign the session object to their own user by writing to the `user` field and then read any custom fields of that session object. Note that assigning a session to another user does not usually change the privileges of either of the two users, and a user cannot assign their own session to another user. This issue is patched in version 4.10.15 and above, and 5.2.6 and above. To mitigate this issue in unpatched versions add a `beforeSave` trigger to the `_Session` class and prevent writing if the requesting user is different from the user in the session object.

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. In versions prior to 4.10.15, or 5.0.0 and above prior to 5.2.6, a user can write to the session object of another user if the session object ID is known. For example, an attacker can assign the session object to their own user by writing to the `user` field and then read any custom fields of that session object. Note that assigning a session to another user does not usually change the privileges of either of the two users, and a user cannot assign their own session to another user. This issue is patched in version 4.10.15 and above, and 5.2.6 and above. To mitigate this issue in unpatched versions add a `beforeSave` trigger to the `_Session` class and prevent writing if the requesting user is different from the user in the session object.

### Impact A foreign user can write to the session object of another user if the session object ID is known. For example, a foreign user can assign the session object to their own user by writing to the `user` field and then read any custom fields of that session object. Note that assigning a session to a foreign user does not usually change the privileges of neither of the two users, according to how Parse Server uses session objects internally. However, if custom logic is used to relate specific session objects to privileges this vulnerability may have a higher level of severity. The vulnerability does not allow a foreign user to assign a session object to themselves, read the session token, and then reassign the session object to the original user to then authenticate as that user with the known session token. The vulnerability only exists for foreign session objects, a user cannot assign their own session to another user. While it is unlikely that the session object ID of another user is known, it is possible to brute-force guess an object ID, even though the attacker would not know to which user a successfully guessed session object ID belongs. ### Patches The fix prevents writing to foreign session objects, even if the session object ID is known. ### Workarounds Add a `beforeSave` trigger to the `_Session` class and prevent writing if the requesting user is different from the user in the session object. ### References - GitHub advisory [GHSA-6w4q-23cf-j9jp](https://github.com/parse-community/parse-server/security/advisories/GHSA-6w4q-23cf-j9jp)

### Impact A foreign user can write to the session object of another user if the session object ID is known. For example, a foreign user can assign the session object to their own user by writing to the `user` field and then read any custom fields of that session object. Note that assigning a session to a foreign user does not usually change the privileges of neither of the two users, according to how Parse Server uses session objects internally. However, if custom logic is used to relate specific session objects to privileges this vulnerability may have a higher level of severity. The vulnerability does not allow a foreign user to assign a session object to themselves, read the session token, and then reassign the session object to the original user to then authenticate as that user with the known session token. The vulnerability only exists for foreign session objects, a user cannot assign their own session to another user. While it is unlikely that the session object ID of another user is known, it is possible to brute-force guess an object ID, even though the attacker would not know to which user a successfully guessed session object ID belongs. ### Patches The fix prevents writing to foreign session objects, even if the session object ID is known. ### Workarounds Add a `beforeSave` trigger to the `_Session` class and prevent writing if the requesting user is different from the user in the session object. ### References - GitHub advisory [GHSA-6w4q-23cf-j9jp](https://github.com/parse-community/parse-server/security/advisories/GHSA-6w4q-23cf-j9jp)

Parse Server es un backend de código abierto que puede desplegarse en cualquier infraestructura que pueda ejecutar Node.js. En versiones anteriores a 4.10.15, o 5.0.0 y superiores, anteriores a 5.2.6, un usuario puede escribir en el objeto de sesión de otro usuario si es conocido el ID del objeto de sesión. Por ejemplo, un atacante puede asignar el objeto de sesión a su propio usuario al escribir en el campo "user" y luego leer cualquier campo personalizado de ese objeto de sesión. Tenga en cuenta que asignar una sesión a otro usuario no suele cambiar los privilegios de ninguno de los dos usuarios, y un usuario no puede asignar su propia sesión a otro usuario. Este problema está parcheado en versiones 4.10.15 y superiores, y 5.2.6 y superiores. Para mitigar este problema en las versiones no parcheadas, añada un desencadenador "beforeSave" a la clase "_Session" y evite la escritura si el usuario solicitante es diferente del usuario en el objeto de sesión.