Host filesystem access via backslash symlink traversal

Symlink following in iwasm before 2.3.0 allows local users to read or create host files outside a WASI preopened directory. On Windows, libc-uvwasi accepts backslash-containing symlink targets, and path_open follows them beyond the preopened directory when opening or creating a file. Exploitation requires execution of an attacker-supplied Wasm module in an affected Windows WAMR instance, exposing readable host data or permitting host file creation.