PT-2020-17537 · Rust · Futures-Util

Published 2020-10-22 · Updated 2022-05-24 · CVE-2020-35905

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions futures-util crate versions prior to 0.3.7

Description An issue in the futures-util crate can cause a data race for certain closure situations in safe code. The affected versions had a Send/Sync implementation for MappedMutexGuard that only considered variance on T, while MappedMutexGuard dereferenced to U. This could have led to data races in safe Rust code when a closure used in MutexGuard::map() returns U that is unrelated to T.

Recommendations For versions prior to 0.3.7, update to version 0.3.7 or later to fix the issue by correcting the Send and Sync implementations and adding a PhantomData<&'a mut U> marker to the MappedMutexGuard type.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2020-35905

GHSA-RH4W-94HH-9943

OPENSUSE-SU-2024:11751-1

RUSTSEC-2020-0059

Affected Products

Futures-Util

References · 8

• 🔥 https://rustsec.org/advisories/RUSTSEC-2020-0059.html · Exploit
• https://osv.dev/vulnerability/CVE-2020-35905 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-35905 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2020-0059 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-rh4w-94hh-9943 · Vendor Advisory
• https://github.com/rust-lang/futures-rs/issues/2239 · Note
• https://github.com/rust-lang/futures-rs · Note
• https://crates.io/crates/futures-util · Note