CVE-2019-25004: Unsound casting in flatbuffers

August 25, 2021 (updated June 13, 2023)

The implementation of impl Follow for bool allows to reinterpret arbitrary bytes as a bool.

In Rust bool has stringent requirements for its in-memory representation. Use of this function allows to violate these requirements and invoke undefined behaviour in safe code.

References

github.com/advisories/GHSA-gx73-2498-r55c
github.com/google/flatbuffers
github.com/google/flatbuffers/issues/5530
nvd.nist.gov/vuln/detail/CVE-2019-25004
rustsec.org/advisories/RUSTSEC-2019-0028.html

Code Behaviors & Features

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