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futures_task::waker may cause a use-after-free if used on a type that isn't 'static

High severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Jun 13, 2023

Package

cargo futures-task (Rust)

Affected versions

>= 0.2.1, < 0.3.6

Patched versions

0.3.6

Description

Affected versions of the crate did not properly implement a 'static lifetime bound on the waker function. This resulted in a use-after-free if Waker::wake() is called after original data had been dropped.

The flaw was corrected by adding 'static lifetime bound to the data waker takes.

References

Published by the National Vulnerability Database Dec 31, 2020
Published to the GitHub Advisory Database May 24, 2022
Reviewed Jun 16, 2022
Last updated Jun 13, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

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

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.051%
(21st percentile)

Weaknesses

CVE ID

CVE-2020-35906

GHSA ID

GHSA-r93v-9p5q-vhpf

Source code

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