GHSA-8v9w-p43c-r885

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GHSA-8v9w-p43c-r885

Summary: Reachable Assertion in rulex

Details: ### Impact When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result. This is a security concern for you, if - your service parses untrusted rulex expressions (expressions provided by an untrusted user), and - your service becomes unavailable when the thread running rulex panics. ### Patches The crashes are fixed in version **0.4.3**. Affected users are advised to update to this version. ### Workarounds You can use `catch_unwind` to recover from panics. ### For more information If you have any questions or comments about this advisory: * Open an issue in [rulex](https://github.com/rulex-rs/rulex/issues) * Email me at [[email protected]](mailto:[email protected]) ### Credits Credit for finding these bugs goes to - [cargo fuzz](https://github.com/rust-fuzz/cargo-fuzz) and [afl.rs](https://github.com/rust-fuzz/afl.rs) - [evanrichter](https://github.com/evanrichter) - [ForAllSecure Mayhem](https://forallsecure.com/)

References: https://github.com/rulex-rs/rulex/security/advisories/GHSA-8v9w-p43c-r885, https://nvd.nist.gov/vuln/detail/CVE-2022-31100, https://github.com/rulex-rs/rulex/commit/fac6d58b25c6f9f8c0a6cdc4dec75b37b219f1d6, https://github.com/rulex-rs/rulex, https://rustsec.org/advisories/RUSTSEC-2022-0031.html