PT-2021-22004 · Unknown · Better-Macro

Published 2021-07-22 · Updated 2021-08-25 · CVE-2021-38196

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: better-macro crate through 2021-07-22

Description: The issue allows remote attackers to execute arbitrary code via proc-macros. The better-macro crate has no legitimate purpose and is intended to demonstrate this capability. It opens a URL, https://github.com/raycar5/better-macro/blob/master/doc/hi.md, which currently does not contain malicious content, but its safety is not guaranteed.

Recommendations: For better-macro crate through 2021-07-22, avoid using this crate as it has no useful functionality and can pose a security risk. As a temporary workaround, consider restricting the use of proc-macros until a safer alternative is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Code Injection

OS Command Injection

Weakness Enumeration

CWE-94

CWE-78

Related Identifiers

CVE-2021-38196

GHSA-79WF-QCQV-R22R

RUSTSEC-2021-0077

Affected Products

Better-Macro

References · 9

• 🔥 https://rustsec.org/advisories/RUSTSEC-2021-0077.html · Exploit
• https://osv.dev/vulnerability/CVE-2021-38196 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-79wf-qcqv-r22r · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-38196 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2021-0077 · Vendor Advisory
• https://github.com/raycar5/better-macro/blob/24ff1702397b9c19bbfa4c660e2316cd77d3b900/src/lib.rs#L36-L38 · Note
• https://github.com/raycar5/better-macro · Note
• https://crates.io/crates/better-macro · Note
• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/better-macro/RUSTSEC-2021-0077.md · Note