PT-2021-17596 · Comrak · Comrak

Kivikakk · Published 2021-02-21 · Updated 2021-08-25 · CVE-2021-27671

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 crate versions prior to 0.9.1

Description An issue in the comrak crate allows cross-site scripting (XSS) to occur due to a case-sensitive protection mechanism for data: and javascript: URIs. This enables attackers to use variations like Data: to launch an attack.

Recommendations For versions prior to 0.9.1, update to version 0.9.1 or later to resolve the issue. As a temporary workaround, consider implementing case-insensitive matching for unsafe URL prefixes, such as data: or javascript:, to prevent exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-27671

GHSA-XMR7-V725-2JJR

RUSTSEC-2021-0026

Affected Products

Comrak

References · 11

• https://osv.dev/vulnerability/RUSTSEC-2021-0026 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27671 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27671 · Security Note
• https://osv.dev/vulnerability/GHSA-xmr7-v725-2jjr · Vendor Advisory
• https://github.com/kivikakk/comrak · Note
• https://github.com/kivikakk/comrak/commit/b3efbb6e427bcd33bb14db45753ad4fd98e0f5bf · Note
• https://github.com/kivikakk/comrak/releases/tag/0.9.1 · Note
• https://rustsec.org/advisories/RUSTSEC-2021-0026.html · Note
• https://t.me/cibsecurity/24120 · Telegram Post
• https://t.me/cvenotify/10709 · Telegram Post
• https://crates.io/crates/comrak · Note