PT-2021-21993 · Comrak · Comrak

Kivikakk · Published 2021-05-04 · Updated 2021-08-25 · CVE-2021-38186

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: comrak versions prior to 0.10.1

Description: An issue in the comrak crate for Rust mishandles & characters, leading to XSS via &# HTML entities. This occurs because ampersands were not being correctly escaped in link targets, making it possible to fashion unsafe URLs using schemes like data: or javascript: by entering them as HTML entities.

Recommendations: For versions prior to 0.10.1, update to version 0.10.1 or later to resolve the issue. As a temporary workaround, consider restricting the use of link targets with HTML entities to minimize the risk of exploitation.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-38186

GHSA-6WJ2-G87R-PM62

RUSTSEC-2021-0063

Affected Products

Comrak

References · 12

• 🔥 https://rustsec.org/advisories/RUSTSEC-2021-0063.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-38186 · Security Note
• https://osv.dev/vulnerability/RUSTSEC-2021-0063 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-6wj2-g87r-pm62 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-38186 · Vendor Advisory
• https://github.com/kivikakk/comrak/commit/b72340cabe4749952530b4fb6b4fcc706bc973e5 · Note
• https://github.com/kivikakk/comrak/compare/0.10.0...0.10.1 · Note
• https://github.com/kivikakk/comrak · Note
• https://github.com/kivikakk/comrak/releases/tag/0.10.1 · Note
• https://t.me/cibsecurity/26977 · Telegram Post
• https://crates.io/crates/comrak · Note
• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/comrak/RUSTSEC-2021-0063.md · Note