CVE-2024-38358: Symlink bypasses filesystem sandbox

June 7, 2024 (updated June 20, 2024)

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_opening the link.

References

github.com/advisories/GHSA-55f3-3qvg-8pv5
github.com/wasmerio/wasmer
github.com/wasmerio/wasmer/commit/b9483d022c602b994103f78ecfe46f017f8ac662
github.com/wasmerio/wasmer/security/advisories/GHSA-55f3-3qvg-8pv5
nvd.nist.gov/vuln/detail/CVE-2024-38358

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