[rand_core] Unaligned memory access in rand_core

Impact

Affected versions of this crate violated alignment when casting byte slices to integer slices, resulting in undefined behavior. rand_core::BlockRng::next_u64 and rand_core::BlockRng::fill_bytes are affected.

Patches

The flaw was corrected by Ralf Jung and Diggory Hardy for rand_core >= 0.4.2.

Workarounds

None.

References

See Rand’s changelog.

For more information

If you have any questions or comments about this advisory, open an issue in the Rand repository.

References

• https://github.com/rust-random/rand/security/advisories/GHSA-mmc9-pwm7-qj5w
• https://github.com/rust-random/rand/blob/master/rand_core/CHANGELOG.md#050—2019-06-06
• https://rustsec.org/advisories/RUSTSEC-2019-0035.html
• https://github.com/advisories/GHSA-mmc9-pwm7-qj5w