WS-2020-0189 (Medium) detected in futures-util-0.3.5.crate

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WS-2020-0189 - Medium Severity Vulnerability

Vulnerable Library - futures-util-0.3.5.crate

Common utilities and extension traits for the futures-rs library.

Library home page: https://crates.io/api/v1/crates/futures-util/0.3.5/download

Dependency Hierarchy:

• hyper-0.13.5.crate (Root Library)
  • h2-0.2.5.crate
    • ❌ futures-util-0.3.5.crate (Vulnerable Library)

Found in HEAD commit: 03a13931029c029c2e33c800cb84ed638aa401db

Found in base branch: master

Vulnerability Details

Affected versions of futures-rs had a Send/Sync implementation for MappedMutexGuard that only considered variance on T, while MappedMutexGuard dereferenced to U.

This could of led to data races in safe Rust code when a closure used in MutexGuard::map() returns U that is unrelated to T.

The issue was fixed by fixing Send and Sync implementations, and by adding a PhantomData<&'a mut U> marker to the MappedMutexGuard type to tell the compiler that the guard is over U too.

This is affecting future-rs 0.3.2 through 0.3.6 and fixed in futures-rs 0.3.7 onwards.

Publish Date: 2020-11-02

URL: WS-2020-0189

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: rust-lang/futures-rs#2239

Release Date: 2020-11-02

Fix Resolution: 0.3.7