PT-2020-17549 · Rust · Pyo3

Published 2020-11-28 · Updated 2021-08-25 · CVE-2020-35917

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 pyo3 crate versions prior to 0.12.4

Description An issue in the pyo3 crate leads to a reference-counting error and use-after-free in From<Py<T>>. This is caused by a bug that results in an extra reference count decrement, often leading to use-after-free issues.

Recommendations For versions prior to 0.12.4, update to version 0.12.4 or later to resolve the issue. As a temporary workaround, consider restricting the use of From<Py<T>> to minimize the risk of exploitation.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2020-35917

GHSA-2VX6-FCW6-HPR6

RUSTSEC-2020-0074

Affected Products

Pyo3

References · 9

• 🔥 https://rustsec.org/advisories/RUSTSEC-2020-0074.html · Exploit
• https://osv.dev/vulnerability/RUSTSEC-2020-0074 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-35917 · Security Note
• https://osv.dev/vulnerability/GHSA-2vx6-fcw6-hpr6 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-35917 · Vendor Advisory
• https://github.com/PyO3/pyo3 · Note
• https://github.com/PyO3/pyo3/commit/8f81f595dd770b586c7ca7195b42004a6c976eb9 · Note
• https://github.com/PyO3/pyo3/pull/1297 · Note
• https://crates.io/crates/pyo3 · Note