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CVE-2023-36823 — Vulnerability in sanitize — CVE Details

HIGH

Sanitize vulnerable to Cross-site Scripting via insufficient neutralization of `style` element content

Published July 6, 2023Updated February 16, 2024Source: osv

Summary

### Impact Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize `>= 3.0.0, < 6.0.2` when Sanitize is configured to use the built-in "relaxed" config or when using a custom config that allows `style` elements and one or more CSS at-rules. This could result in XSS (cross-site scripting) or other undesired behavior when the malicious HTML and CSS are rendered in a browser. ### Patches Sanitize `>= 6.0.2` performs additional escaping of CSS in `style` element content, which fixes this issue. ### Workarounds Users who are unable to upgrade can prevent this issue by using a Sanitize config that doesn't allow `style` elements, using a Sanitize config that doesn't allow CSS at-rules, or by manually escaping the character sequence `</` as `<\/` in `style` element content. ### Credit This issue was found by @cure53 during an audit of a project that uses Sanitize and was reported by one of that project's maintainers. Thank you!

Advisory Timeline

  • First published July 6, 2023 (1194 days ago).
  • Last revised February 16, 2024 — 225 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update sanitize to 6.0.2 or later
gem install sanitize -v 6.0.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
sanitize
rubygems
3.0.0, 3.0.1, 3.0.2, 3.0.3 (+26 more)6.0.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

References

Frequently Asked Questions

What is CVE-2023-36823?
Sanitize vulnerable to Cross-site Scripting via insufficient neutralization of `style` element content This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.1/10).
How do I check if my project is affected by CVE-2023-36823?
CVE-2023-36823 affects sanitize. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-36823 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.1

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-f5ww-cq3m-q3g7

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