Authenticated file write via path traversal

Path traversal in ASUS Router firmware 3.0.0.4_386, 3.0.0.4_388, and 3.0.0.6_102 allows remote authenticated users to write files. ASUS has not disclosed the affected request handler or the filesystem operation that fails to restrict attacker-controlled paths to the intended directory. Administrative authentication is required, and exploitation creates or overwrites files outside that directory, affecting router integrity without reported disclosure or service interruption.