CVE-2022-23631

superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. This has been patched in superjson 1.8.1. Users are advised to update. There are no known workarounds for this issue.

superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. This has been patched in superjson 1.8.1. Users are advised to update. There are no known workarounds for this issue.

### Impact This is critical vulnerability, as it allows to run arbitrary code on any server using superjson input, including a Blitz.js server, without prior authentication or knowledge. Attackers gain full control over the server so they could steal and manipulate data or attack further systems. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. In the case of Blitz.js, it would be at least one RPC call. ### Patches This has been patched in superjson 1.8.1 and Blitz.js 0.45.3. If you are unable to upgrade to Blitz.js 0.45.3 in a timely manner, you can instead upgrade only superjson to version 1.8.1 using yarn resolutions are similar. Blitz versions < 0.45.3 are only affected because they used superjson versions < 1.8.1. ### Workarounds None ### For more information If you have any questions or comments about this advisory: * Open an issue in https://github.com/blitz-js/superjson * Email us at b@bayer.ws ### References * https://www.sonarsource.com/blog/blitzjs-prototype-pollution/

### Impact This is critical vulnerability, as it allows to run arbitrary code on any server using superjson input, including a Blitz.js server, without prior authentication or knowledge. Attackers gain full control over the server so they could steal and manipulate data or attack further systems. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. In the case of Blitz.js, it would be at least one RPC call. ### Patches This has been patched in superjson 1.8.1 and Blitz.js 0.45.3. If you are unable to upgrade to Blitz.js 0.45.3 in a timely manner, you can instead upgrade only superjson to version 1.8.1 using yarn resolutions are similar. Blitz versions < 0.45.3 are only affected because they used superjson versions < 1.8.1. ### Workarounds None ### For more information If you have any questions or comments about this advisory: * Open an issue in https://github.com/blitz-js/superjson * Email us at b@bayer.ws ### References * https://www.sonarsource.com/blog/blitzjs-prototype-pollution/

superjson es un programa que permite serializar expresiones JavaScript a un superconjunto de JSON. En las versiones anteriores a 1.8.1 superjson permite ejecutar código arbitrario en cualquier servidor que use superjson sin necesidad de autenticación o conocimiento previo. El único requisito es que el servidor implemente al menos un endpoint que use superjson durante el procesamiento de la petición. Esto ha sido parcheado en superjson versión 1.8.1. Es recomendado a usuarios actualizar. No se presentan medidas de mitigación conocidas para este problema