CVE-2020-36203: Data races in reffers

August 25, 2021 (updated June 13, 2023)

ARefss<‘a, V> is a type that is assumed to contain objects that are Send + Sync.

In the affected versions of this crate, Send/Sync traits are unconditionally implemented for ARefss<‘a, V>.

By using the ARefss::map() API, we can insert a !Send or !Sync object into ARefss<‘a, V>. After that, it is possible to create a data race to the inner object of ARefss<‘a, V>, which can lead to undefined behavior & memory corruption.

The flaw was corrected in commit 6dd7ca0 by adding trait bound V: Send + Sync to ARefss::map() API.

References

github.com/advisories/GHSA-39xg-8p43-h76x
github.com/diwic/reffers-rs
github.com/diwic/reffers-rs/commit/6dd7ca0d50f2464df708975cdafcfaeeb6d41c66
github.com/diwic/reffers-rs/issues/7
nvd.nist.gov/vuln/detail/CVE-2020-36203
rustsec.org/advisories/RUSTSEC-2020-0094.html

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