GHSA-j2xg-cjcx-4677

Опубликовано: 03 янв. 2025

Источник: github

Github: Прошло ревью

CVSS4: 8.3

CVSS3: 7.1

Описание

PhpSpreadsheet allows unauthorized Reflected XSS in Currency.php file

Unauthorized Reflected XSS in `Currency.php` file

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/Wizards/NumberFormat/Currency.php script, an attacker can perform XSS-type attack Impact: executing arbitrary JavaScript code in the browser Vulnerable component: the /vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php file Exploitation conditions: an unauthorized user Mitigation: sanitization of the currency variable Researcher: Aleksey Solovev (Positive Technologies)

Research

The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in Currency.php file) in Phpspreadsheet.

There is no sanitization in the /vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php file, which leads to the possibility of a XSS attack. Strings are formed using the currency parameter without sanitization, controlled by an attacker.

fig9

Figure 9. A fragment of the query in which a string and a parameter are formed without sanitization

An attacker can prepare a special HTML form that will be automatically sent to the vulnerable scenario.

Listing 5. HTML form that demonstrates the exploitation of the XSS vulnerability

<html>  <body> <form action="https://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php" method="POST"> <input type="hidden" name="number" value="1234.5678" /> <input type="hidden" name="currency" value="$'"<img src=1 onerror=alert()>" /> <input type="hidden" name="decimals" value="2" /> <input type="hidden" name="position" value="1" /> <input type="hidden" name="spacing" value="0" /> <input type="hidden" name="submit" value="Display Mask" /> <input type="submit" value="Submit request" /> </form> <script> history.pushState('', '', '/'); document.forms[0].submit(); </script> </body> </html>

After sending the script provided in Listing 5, the XSS vulnerability is exploited. Figure 10 shows the execution of arbitrary JavaScript code during the submission of a POST form.

Figure 10. Executing arbitrary JavaScript code

Credit

This vulnerability was discovered by Aleksey Solovev (Positive Technologies)

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