PT-2018-15489 · Rust · Crossbeam

C0Gent · Published 2018-12-09 · Updated 2021-08-25 · CVE-2018-20996

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions crossbeam versions prior to 0.4.1

Description The issue arises from destructor mishandling, leading to a double free when an element is popped from a queue. This occurs because crossbeam runs the destructor inside the epoch-based garbage collector, even after the element has been removed. The problem was resolved by wrapping elements inside queues in a ManuallyDrop.

Recommendations For versions prior to 0.4.1, update to version 0.4.1 or later to resolve the issue. As a temporary workaround, consider avoiding the use of queues in a way that could trigger the double free, until the update can be applied.

Exploit

Fix

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

CVE-2018-20996

GHSA-C3CW-C387-PJ65

RUSTSEC-2018-0009

Affected Products

Crossbeam

References · 11

• 🔥 https://github.com/crossbeam-rs/crossbeam-epoch · Exploit
• 🔥 https://github.com/crossbeam-rs/crossbeam-epoch/issues/82 · Exploit
• https://osv.dev/vulnerability/GHSA-c3cw-c387-pj65 · Vendor Advisory
• https://osv.dev/vulnerability/RUSTSEC-2018-0009 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-20996 · Security Note
• https://ubuntu.com/security/CVE-2018-20996 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-20996 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20996 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-20996 · Vendor Advisory
• https://rustsec.org/advisories/RUSTSEC-2018-0009.html · Note
• https://crates.io/crates/crossbeam · Note