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HIGH7.1

GHSA-jmpx-686v-c3wx

PhpSpreadsheet allows unauthorized Reflected XSS in the constructor of the Downloader class

Quick fix

GHSA-jmpx-686v-c3wx — phpoffice/phpspreadsheet: upgrade to the fixed version with the command below.

composer require phpoffice/phpspreadsheet:^3.7.0

Details

# Unauthorized Reflected XSS in the constructor of the `Downloader` class

**Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/download.php` script, an attacker can perform a XSS-type attack **Impact**: execution of arbitrary JavaScript code in the browser **Vulnerable component**: the constructor of the `Downloader` class **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the `name` and `type` variables **Researcher**: Aleksey Solovev (Positive Technologies)

# Research

The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in the constructor of the `Downloader` class) in Phpspreadsheet.

The latest version (3.6.0) of the `phpoffice/phpspreadsheet` library was installed. The installation was carried out with the inclusion of examples.

*Listing 1. Installing the `phpoffice/phpspreadsheet` library* ``` $ composer require phpoffice/phpspreadsheet --prefer-source ```

The `./vendor/phpoffice/phpspreadsheet/samples/download.php` file processes the GET parameters `name` and `type`.

![fig1](https://github.com/user-attachments/assets/78d5b3c7-e2ab-4487-98e2-a975f74a71c0)

*Figure 1. The `./vendor/phpoffice/phpspreadsheet/samples/download.php` file accepts GET parameters.*

Consider the constructor of the `Downloader` class, where GET parameters are passed. Error is displayed without sanitization using GET parameters transmitted from the user.

![fig2](https://github.com/user-attachments/assets/00baf1f8-298c-4654-a3e4-b99cf8053eac)

*Figure 2. Error is displayed without sanitization*

When clicking on the following link, arbitrary JavaScript code will be executed.

*Listing 2.* ``` https://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/download.php?name=%3Cimg%20src=1%20onerror=alert()%3E&type=1 ```

Demonstration of the execution of arbitrary JavaScript code.

<img width="537" alt="fig3" src="https://github.com/user-attachments/assets/745d6e21-396f-4357-8ff8-e856adf15fee" />

*Figure 3. Executing arbitrary JavaScript code*

# Credit This vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**

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Affected packages

Packagist/phpoffice/phpspreadsheet
Introduced in: 3.0.0Fixed in: 3.7.0
Fixcomposer require phpoffice/phpspreadsheet:^3.7.0
Packagist/phpoffice/phpspreadsheet
Introduced in: 0Fixed in: 1.29.7
Fixcomposer require phpoffice/phpspreadsheet:^1.29.7
Packagist/phpoffice/phpspreadsheet
Introduced in: 2.0.0Fixed in: 2.1.6
Fixcomposer require phpoffice/phpspreadsheet:^2.1.6
Packagist/phpoffice/phpspreadsheet
Introduced in: 2.2.0Fixed in: 2.3.5
Fixcomposer require phpoffice/phpspreadsheet:^2.3.5
Packagist/phpoffice/phpexcel
Introduced in: 0

No fixed version published yet for phpoffice/phpexcel (composer). Pin to a known-safe version or switch to an alternative.

References