php-svg-lib lacks path validation on font through SVG inline styles
Summary
php-svg-lib fails to validate that font-family doesn't contain a PHAR url, which might leads to RCE on PHP < 8.0, and doesn't validate if external references are allowed. This might leads to bypass of restrictions or RCE on projects that are using it, if they do not strictly revalidate the fontName that is passed by php-svg-lib.
Details
The Style::fromAttributes(), or the Style::parseCssStyle() should check the content of the font-family and prevents it to use a PHAR url, to avoid passing an invalid and dangerous fontName value to other libraries. The same check as done in the Style::fromStyleSheets might be reused :
if (
\array_key_exists("font-family", $styles)
&& (
\strtolower(\substr($this->href, 0, 7)) === "phar://"
|| ($this->document->allowExternalReferences === false && \strtolower(\substr($this->href, 0, 5)) !== "data:")
)
) {
unset($style["font-family"]);
}
PoC
Parsing the following SVG :
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="200">
<text x="20" y="35" style="color:red;font-family:phar:///path/to/whatever.phar/blaklis;">My</text>
</svg>
will pass the phar:///path/to/whatever.phar/blaklis as $family in SurfaceCpdf::setFont, which is then passed to the canvas selectFont as a $fontName.
Impact
Libraries using this library as a dependency might be vulnerable to some bypass of restrictions, or even RCE, if they do not double check the value of the fontName that is passed by php-svg-lib
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | phenx/php-svg-lib | < 0.5.2 | 0.5.2 |
Referencias
- https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-f3qr-qr4x-j273
- https://nvd.nist.gov/vuln/detail/CVE-2024-25117
- https://github.com/dompdf/php-svg-lib/commit/732faa9fb4309221e2bd9b2fda5de44f947133aa
- https://github.com/dompdf/php-svg-lib/commit/8ffcc41bbde39f09f94b9760768086f12bbdce42
- https://github.com/dompdf/php-svg-lib
- Vector CVSS
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L- Debilidad (CWE)
CWE-502, CWE-610, CWE-73- Plataforma
- Composer
- Paquete
phenx/php-svg-lib- Publicada
- 21.02.2024
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-f3qr-qr4x-j273 - CC BY 4.0
Historial de vulnerabilidades: phenx/php-svg-lib
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 3
- Primera → última
- 12.2023 02.2024
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Media 2
Divulgaciones por año
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 0
-
php-svg-lib lacks path validation on font through SVG inline styles esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.