Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1yOHc4LTc0d3ctajR3aM4ABABe

PhpSpreadsheet HTML writer is vulnerable to Cross-Site Scripting via JavaScript hyperlinks

Summary

\PhpOffice\PhpSpreadsheet\Writer\Html does not sanitize "javascript:" URLs from hyperlink href attributes, resulting in a Cross-Site Scripting vulnerability.

PoC

Example target script:

<?php

require 'vendor/autoload.php';

$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx");
$spreadsheet = $reader->load(__DIR__ . '/book.xlsx');

$writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet);
print($writer->generateHTMLAll());

Save this file in the same directory:
book.xlsx

Open index.php in a web browser and click on both links. The first demonstrates the vulnerability in a regular hyperlink and the second in a HYPERLINK() formula.

Permalink: https://github.com/advisories/GHSA-r8w8-74ww-j4wh
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1yOHc4LTc0d3ctajR3aM4ABABe
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 14 days ago
Updated: 14 days ago

CVSS Score: 5.4
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-r8w8-74ww-j4wh, CVE-2024-45292
References:

• https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-r8w8-74ww-j4wh
• https://github.com/PHPOffice/PhpSpreadsheet/commit/392dd08c5569b623060784e1333454d64df1f03d
• https://github.com/PHPOffice/PhpSpreadsheet/commit/8b9b378ecdc603234a34aab3b293d2cdc8e9210e
• https://github.com/PHPOffice/PhpSpreadsheet/commit/f0b70ed1086348904b27772b264e1605ba6c1d6d
• https://nvd.nist.gov/vuln/detail/CVE-2024-45292
• https://github.com/advisories/GHSA-r8w8-74ww-j4wh

Repository: https://github.com/PHPOffice/PhpSpreadsheet
Blast Radius: 23.2

Affected Packages