Reflected cross-site scripting (XSS) In phpoffice/phpspreadsheet
Description
PhpSpreadsheet allows unauthorized Reflected XSS in the Accounting.php file
Unauthorized Reflected XSS in the Accounting.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/Accounting.php script, an attacker can perform a XSS-type attack
Impact: executing arbitrary JavaScript code in the browser
Vulnerable component: the /vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.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 Accounting.php file) in Phpspreadsheet.
There is no sanitization in the /vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php file, which leads to the possibility of a XSS attack.
Strings are formed using the currency parameter without sanitization, which is controlled by the attacker.
Figure 7. 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 4. HTML form that demonstrates the exploitation of the XSS vulnerability
<html> <!-- CSRF PoC - generated by Burp Suite Professional --> <body> <form action="https://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.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" />...
After sending the script provided in Listing 4, the XSS vulnerability is exploited. Figure 8 shows the execution of arbitrary JavaScript code during the submission of a POST form.
Figure 8. Executing arbitrary JavaScript code
Credit
This vulnerability was discovered by Aleksey Solovev (Positive Technologies)
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Package | Affected version | Patched versions |
|---|---|---|---|
 packagist | 3.7.0, 1.29.7, 2.1.6, 2.3.5 | ||
packagist | - |
Aliases
References