Reported

December 22, 2020

Issued

January 20, 2021 (last modified: June 13, 2023)

Package

conquer-once (crates.io)

Type

Vulnerability

Categories

• memory-corruption
• thread-safety

Keywords

#concurrency

Aliases

• CVE-2020-36208
• GHSA-3jc5-5hc5-33gj

References

• https://github.com/oliver-giersch/conquer-once/issues/3

CVSS Score

7.8 HIGH

CVSS Details

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS Vector

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

Patched

• >=0.3.2

Description

Affected versions of conquer-once implements Sync for its OnceCell type without restricting it to Sendable types.

This allows non-Send but Sync types such as MutexGuard to be sent across threads leading to undefined behavior and memory corruption in concurrent programs.

The issue was fixed by adding a Send constraint to OnceCell.

Advisory available under CC0-1.0 license.