Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PHPOffice | PhpSpreadsheet | < 1.29.4, >= 2.0.0, < 2.1.3, >= 2.2.0, < 2.3.2, >= 3.3.0, < 3.4.0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | phpoffice/phpexcel | <= 1.8.2 | — | GHSA-jw4x-v69f-hh5w |
| Packagist | phpoffice/phpspreadsheet | < 1.29.4 | 1.29.4 | GHSA-jw4x-v69f-hh5w |
| Packagist | phpoffice/phpspreadsheet | >= 2.0.0, < 2.1.3 | 2.1.3 | GHSA-jw4x-v69f-hh5w |
| Packagist | phpoffice/phpspreadsheet | >= 2.2.0, < 2.3.2 | 2.3.2 | GHSA-jw4x-v69f-hh5w |
| Packagist | phpoffice/phpspreadsheet | >= 3.3.0, < 3.4.0 | 3.4.0 | GHSA-jw4x-v69f-hh5w |
References
- https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-jw4x-v69f-hh5w
- https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
- https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing
- https://www.w3.org/TR/xml/#sec-guessing-no-ext-info