RUSTSEC-2020-0151

Generators can cause data races if non-Send types are used in their generator functions

Reported

November 16, 2020

Issued

March 30, 2021 (last modified: October 19, 2021)

Package

generator (crates.io)

Type

Vulnerability

Categories

memory-corruption

Keywords

#concurrency

Aliases

CVE-2020-36471

Details

https://github.com/Xudong-Huang/generator-rs/issues/27

CVSS Score

5.9 MEDIUM

CVSS Details

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

CVSS Vector

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

Patched

>=0.7.0

Description

The Generator type is an iterable which uses a generator function that yields values. In affected versions of the crate, the provided function yielding values had no Send bounds despite the Generator itself implementing Send.

The generator function lacking a Send bound means that types that are dangerous to send across threads such as Rc could be sent as part of a generator, potentially leading to data races.

This flaw was fixed in commit f7d120a3b by enforcing that the generator function be bound by Send.