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crossbeam-channel Undefined Behavior before v0.4.4

High severity GitHub Reviewed Published Oct 14, 2020 in crossbeam-rs/crossbeam • Updated Jun 13, 2023

Package

cargo crossbeam-channel (Rust)

Affected versions

= 0.4.3

Patched versions

0.4.4

Description

Impact

The affected version of this crate's the bounded channel incorrectly assumes that Vec::from_iter has allocated capacity that same as the number of iterator elements. Vec::from_iter does not actually guarantee that and may allocate extra memory. The destructor of the bounded channel reconstructs Vec from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when Vec::from_iter has allocated different sizes with the number of iterator elements.

Patches

This has been fixed in crossbeam-channel 0.4.4.

We recommend users to upgrade to 0.4.4.

References

See crossbeam-rs/crossbeam#533, crossbeam-rs/crossbeam#539, and rustsec/advisory-db#425 for more details.

License

This advisory is in the public domain.

References

@taiki-e taiki-e published to crossbeam-rs/crossbeam Oct 14, 2020
Published by the National Vulnerability Database Oct 16, 2020
Reviewed Aug 3, 2021
Published to the GitHub Advisory Database Aug 25, 2021
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
Network
Attack complexity
High
Privileges required
None
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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.698%
(81st percentile)

Weaknesses

CVE ID

CVE-2020-15254

GHSA ID

GHSA-v5m7-53cv-f3hx

Source code

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