GHSA-xrqq-wqh4-5hg2: svg-sanitizer has Cross-site Scripting Bypass

1. GitHub Advisory Database
2. GitHub Reviewed
3. CVE-2023-28426

svg-sanitizer has Cross-site Scripting Bypass

Moderate severity GitHub Reviewed Published Mar 20, 2023 in darylldoyle/svg-sanitizer • Updated Mar 20, 2023

Package

composer enshrined/svg-sanitize (Composer)

Affected versions

< 0.16.0

A bypass has been found that allows an attacker to upload an SVG with persistent XSS.

HTML elements within CDATA needed to be sanitized correctly, as we were converting them to a textnode and therefore, the library wasn’t seeing them as DOM elements.

Any data within a CDATA node will now be sanitised using HTMLPurifier. We’ve also removed many of the HTML and MathML elements from the allowed element list, as without ForiegnObject, they’re not legal within the SVG context.

Additional tests have been added to the test suite to account for these new bypasses.

Impact

This impacts all users of the svg-sanitizer library.

Patches

This issue is fixed in 0.16.0 and higher.

Workarounds

There is currently no workaround available without upgrading.

For more information

If you have any questions or comments about this advisory:

Open an issue in Github
Email us at [email protected]

References

• GHSA-xrqq-wqh4-5hg2
• https://nvd.nist.gov/vuln/detail/CVE-2023-28426
• darylldoyle/svg-sanitizer@cce18bc

Published by the National Vulnerability Database

Mar 20, 2023

Published to the GitHub Advisory Database

Mar 20, 2023

Last updated

Mar 20, 2023