PT-2020-17531 · Rust · Actix-Service

Published 2020-01-08 · Updated 2021-08-25 · CVE-2020-35899

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 actix-service crate versions prior to 1.0.6

Description The issue arises from a custom implementation of a Cell primitive in the affected versions of the actix-service crate, which fails to track mutable references to the underlying data. This flaw allows obtaining multiple mutable references to the same object, potentially resulting in arbitrary memory corruption, most likely use-after-free. The estimated number of potentially affected devices worldwide is not available. There is no information about real-world incidents where this issue was exploited.

Recommendations For versions prior to 1.0.6, update to version 1.0.6 or later, which corrects the flaw by switching from a bespoke Cell<T> implementation to Rc<RefCell<T>>.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2020-35899

GHSA-WHC7-5P35-4WW2

RUSTSEC-2020-0046

Affected Products

Actix-Service

References · 10

• 🔥 https://rustsec.org/advisories/RUSTSEC-2020-0046.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-35899 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2020-0046 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-35899 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-whc7-5p35-4ww2 · Vendor Advisory
• https://github.com/actix/actix-net/commit/a67e38b4a07c92a3c81fa833f9eb1e91e74e39b7 · Note
• https://github.com/actix/actix-net/pull/158 · Note
• https://github.com/actix/actix-net · Note
• https://t.me/cvenotify/8222 · Telegram Post
• https://crates.io/crates/actix-service · Note