php-svg-lib is an SVG file parsing / rendering library. Prior to version 0.5.1, when parsing the attributes passed to a use tag inside an svg document, an attacker can cause the system to go to an infinite recursion. Depending on the system configuration and attack pattern this could exhaust the memory available to the executing process and/or to the server itself. An attacker sending multiple request to a system to render the above payload can potentially cause resource exhaustion to the point that the system is unable to handle incoming request. Version 0.5.1 contains a patch for this issue.
Weakness
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Php-svg-lib | Dompdf | * | 0.5.1 (excluding) |
Potential Mitigations
Related Attack Patterns
References
- https://github.com/dompdf/php-svg-lib/commit/88163cbe562d9b391b3a352e54d9c89d02d77ee0
- https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-ff5x-7qg5-vwf2
- https://github.com/dompdf/php-svg-lib/commit/88163cbe562d9b391b3a352e54d9c89d02d77ee0
- https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-ff5x-7qg5-vwf2