GHSA-5w5r-mf82-595p
Cap'n Proto has Undefined Behavior in constant::Reader and StructSchema
Severidad por fuente
La etiqueta propia de Trivy es CRITICAL. Crítica según GHSA.
Descripción
The safe API functions `constant::Reader::get` and `StructSchema::new` rely on `PointerReader::get_root_unchecked`, which can cause undefined behavior (UB) by constructing arbitrary words or schemas. ## `Reader::get` ```rust pub fn get(&self) -> Result<<T as Owned>::Reader<'static>> { // ... // UNSAFE: access `words` without validation } ``` ## `StructSchema::new` ```rust pub fn new(builder: RawBrandedStructSchema) -> StructSchema { // ... // UNSAFE: access encoded nodes without validation } ``` This vulnerability allows safe Rust code to trigger UB, which violates Rust's safety guarantees. The issue is resolved in version `0.24.0` by making constructor functions unsafe and mark the fields of struct as visible only in the crate.
Paquetes afectados y versiones corregidas
| Fuente | Paquete | Corregido en |
|---|---|---|
| cargo::GitHub Security Advisory Rust | capnp | 0.24.0 |
Referencias
- https://github.com/capnproto/capnproto-rust
- https://github.com/capnproto/capnproto-rust/commit/7b981f4c75a975c80444cd38729bcdf12bf3eabf
- https://github.com/capnproto/capnproto-rust/commit/e3aeec213e6d1b30a182bf61682a370f20d8a02c
- https://github.com/capnproto/capnproto-rust/issues/605
- https://rustsec.org/advisories/RUSTSEC-2025-0143.html