Description

svg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, Resolver::processReferences() in src/ElementReference/Resolver.php builds the SVG <use> reference graph with a case-sensitive href attribute predicate before cleanHrefAttributes() normalizes mixed-case names. An attacker can provide xlink:HrEf on nested <use> elements so the graph omits those references, after which the sanitizer converts the attribute to canonical xlink:href and returns the live nesting structure without applying the useNestingLimit protection. A consuming application that renders the sanitized SVG can therefore be exposed to the resource exhaustion that control is designed to prevent. This issue is fixed in version 1.0.0.

Quick Facts

References

• https://github.com/darylldoyle/svg-sanitizer/commit/2dff6628…
• https://github.com/darylldoyle/svg-sanitizer/releases/tag/1.…
• https://github.com/darylldoyle/svg-sanitizer/security/adviso…

External Resources