RUSTSEC-2020-0094

Unsound: can make ARefss contain a !Send, !Sync object.

Reported

December 1, 2020

Issued

January 6, 2021 (last modified: October 19, 2021)

Package

reffers (crates.io)

Type

INFO Unsound

Categories

Keywords

#concurrency

Aliases

CVE-2020-36203

Details

https://github.com/diwic/reffers-rs/issues/7

CVSS Score

4.7 MEDIUM

CVSS Details

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Patched

>=0.6.1

Description

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 (https://github.com/diwic/reffers-rs/commit/6dd7ca0d50f2464df708975cdafcfaeeb6d41c66) by adding trait bound V: Send + Sync to ARefss::map() API.