PT-2020-17521 · Rust · Crayon

Published 2020-08-31 · Updated 2021-08-25 · CVE-2020-35889

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions crayon crate through 2020-08-31 for Rust

Description The issue is related to a time-of-check to time-of-use (TOCTOU) bug in the ObjectPool and HandlePool, which can lead to a memory safety violation via HandleLike. This is because the HandleLike trait methods are assumed to be pure, but this assumption is unsound as HandleLike is a safe, public trait that allows custom implementations.

Recommendations For the crayon crate through 2020-08-31, consider restricting the use of the ObjectPool and HandlePool until a fix is available, and avoid using custom implementations of the HandleLike trait to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2020-35889

GHSA-M833-JV95-MFJH

RUSTSEC-2020-0037

Affected Products

Crayon

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2020-35889 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2020-0037 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-m833-jv95-mfjh · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-35889 · Vendor Advisory
• https://github.com/shawnscode/crayon · Note
• https://github.com/shawnscode/crayon/issues/87 · Note
• https://rustsec.org/advisories/RUSTSEC-2020-0037.html · Note
• https://t.me/cvenotify/8004 · Telegram Post
• https://crates.io/crates/crayon · Note