Symlink bypasses filesystem sandbox in wasmer

Vulnerability Description

Wasmer is a web assembly (wasm) Runtime supporting WASIX, WASI and Emscripten. If the preopened directory has a symlink pointing outside, WASI programs can traverse the symlink and access host filesystem if the caller sets both `oflags::creat` and `rights::fd_write`. Programs can also crash the runtime by creating a symlink pointing outside with `path_symlink` and `path_open`ing the link. This issue has been addressed in commit `b9483d022` which has been included in release version 4.3.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

References

• https://github.com/wasmerio/wasmer/security/advisories/GHSA-55f3-3qvg-8pv5
• https://github.com/wasmerio/wasmer/commit/b9483d022c602b994103f78ecfe46f017f8ac662