CVE-2019-25225: sanitize-html XSS — Exploit & Fix

Description

`sanitize-html` prior to version 2.0.0-beta is vulnerable to Cross-site Scripting (XSS). The `sanitizeHtml()` function in `index.js` does not sanitize content when using the custom `transformTags` option, which is intended to convert attribute values into text. As a result, malicious input can be transformed into executable code.

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CVSS v3.1 Score

6.1

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
apostrophecms	sanitize-html	< 2.0.0

References

Advisories & Patches

https://github.com/apostrophecms/sanitize-html/commit/712cb6895825c8bb6ede71a16b42bade42abcaf3 https://github.com/apostrophecms/sanitize-html/issues/293 https://github.com/apostrophecms/sanitize-html/pull/156

Exploits

https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2019/CVE-2019-25225

Frequently Asked Questions

What is CVE-2019-25225? +

`sanitize-html` prior to version 2.0.0-beta is vulnerable to Cross-site Scripting (XSS). The `sanitizeHtml()` function in `index.js` does not sanitize content when using the custom `transformTags` option, which is intended to convert attribute values into text. As a result, malicious input can be transformed into executable code. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2019-25225? +

CVE-2019-25225 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2019-25225? +

CVE-2019-25225 affects products from apostrophecms, specifically: sanitize-html. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2019-25225? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2019-25225