CVE-2025-34352

JumpCloud Remote Assist for Windows versions prior to 0.317.0 include an uninstaller that is invoked by the JumpCloud Windows Agent as NT AUTHORITY\SYSTEM during agent uninstall or update operations. The Remote Assist uninstaller performs privileged create, write, execute, and delete actions on predictable files inside a user-writable %TEMP% subdirectory without validating that the directory is trusted or resetting its ACLs when it already exists. A local, low-privileged attacker can pre-create the directory with weak permissions and leverage mount-point or symbolic-link redirection to (a) coerce arbitrary file writes to protected locations, leading to denial of service (e.g., by overwriting sensitive system files), or (b) win a race to redirect DeleteFileW() to attacker-chosen targets, enabling arbitrary file or folder deletion and local privilege escalation to SYSTEM. This issue is fixed in JumpCloud Remote Assist 0.317.0 and affects Windows systems where Remote Assist is installed and managed through the Agent lifecycle.

JumpCloud Remote Assist for Windows versions prior to 0.317.0 include an uninstaller that is invoked by the JumpCloud Windows Agent as NT AUTHORITY\SYSTEM during agent uninstall or update operations. The Remote Assist uninstaller performs privileged create, write, execute, and delete actions on predictable files inside a user-writable %TEMP% subdirectory without validating that the directory is trusted or resetting its ACLs when it already exists. A local, low-privileged attacker can pre-create the directory with weak permissions and leverage mount-point or symbolic-link redirection to (a) coerce arbitrary file writes to protected locations, leading to denial of service (e.g., by overwriting sensitive system files), or (b) win a race to redirect DeleteFileW() to attacker-chosen targets, enabling arbitrary file or folder deletion and local privilege escalation to SYSTEM. This issue is fixed in JumpCloud Remote Assist 0.317.0 and affects Windows systems where Remote Assist is installed and managed through the Agent lifecycle.

JumpCloud Remote Assist para Windows versiones anteriores a 0.317.0 incluye un desinstalador que es invocado por el Agente de Windows de JumpCloud como NT AUTHORITY\SYSTEM durante operaciones de desinstalación o actualización del agente. El desinstalador de Remote Assist realiza acciones privilegiadas de creación, escritura, ejecución y eliminación en archivos predecibles dentro de un subdirectorio %TEMP% escribible por el usuario sin validar que el directorio sea de confianza o restablecer sus ACL cuando ya existe. Un atacante local con pocos privilegios puede pre-crear el directorio con permisos débiles y aprovechar la redirección de puntos de montaje o enlaces simbólicos para (a) forzar escrituras de archivos arbitrarias en ubicaciones protegidas, lo que lleva a una denegación de servicio (por ejemplo, sobrescribiendo archivos de sistema sensibles), o (b) ganar una carrera para redirigir DeleteFileW() a objetivos elegidos por el atacante, lo que permite la eliminación arbitraria de archivos o carpetas y la escalada de privilegios local a SYSTEM. Este problema está solucionado en JumpCloud Remote Assist 0.317.0 y afecta a los sistemas Windows donde Remote Assist está instalado y gestionado a través del ciclo de vida del Agente.