PT-2020-17559 · Rust · Thex

Published 2020-12-08 · Updated 2021-08-25 · CVE-2020-35927

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions thex crate through 2020-12-08

Description An issue in the thex crate allows cross-thread data races of non-Send types. Specifically, thex::Thex<T> implements Sync for all types T, but it is missing a bound for T: Send. This allows non-Send types, such as Rc, to be sent across thread boundaries, which can trigger undefined behavior and memory corruption.

Recommendations For thex crate through 2020-12-08, consider restricting the use of thex::Thex<T> to only Send types to minimize the risk of exploitation. As a temporary workaround, avoid using thex::Thex<T> with non-Send types such as Rc until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-662

Related Identifiers

CVE-2020-35927

GHSA-J42V-6WPM-R847

RUSTSEC-2020-0090

Affected Products

Thex

References · 6

• https://osv.dev/vulnerability/CVE-2020-35927 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-35927 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2020-0090 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-j42v-6wpm-r847 · Vendor Advisory
• https://rustsec.org/advisories/RUSTSEC-2020-0090.html · Note
• https://crates.io/crates/thex · Note