CVE-2024-47873

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, prior to versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0, the regexes used in the `scan` method and the findCharSet method can be bypassed by using UCS-4 and encoding guessing. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-jw4x-v69f-hh5w
https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing
https://www.w3.org/TR/xml/#sec-guessing-no-ext-info

Configurations

No configuration.

History

19 Nov 2024, 21:57

Type	Values Removed	Values Added
Summary		(es) PhpSpreadsheet es una librería PHP para leer y escribir archivos de hojas de cálculo. La clase XmlScanner tiene un método de escaneo que debería evitar ataques XXE. Sin embargo, antes de las versiones 1.9.4, 2.1.3, 2.3.2 y 3.4.0, las expresiones regulares utilizadas en el método `scan` y en el método findCharSet se pueden omitir utilizando UCS-4 y adivinando la codificación. Un atacante puede omitir el desinfectante y lograr un ataque de entidad externa XML. Las versiones 1.9.4, 2.1.3, 2.3.2 y 3.4.0 solucionan el problema.

18 Nov 2024, 17:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-11-18 17:15

Updated : 2024-11-19 21:57

NVD link : CVE-2024-47873

Mitre link : CVE-2024-47873

CVE.ORG link : CVE-2024-47873

JSON object : View

Products Affected

No product.

CWE

CWE-611

Improper Restriction of XML External Entity Reference

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