Headline

GHSA-wgmf-q9vr-vww6: PhpSpreadsheet HTML writer is vulnerable to Cross-Site Scripting via style information

Summary

\PhpOffice\PhpSpreadsheet\Writer\Html doesn’t sanitize spreadsheet styling information such as font names, allowing an attacker to inject arbitrary JavaScript on the page.

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. An alert should be displayed.

Impact

Full takeover of the session of users viewing spreadsheet files as HTML.

2 months ago

ghsa

Open in Source

#xss #vulnerability #web #git #java #php

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GitHub Advisory Database
GitHub Reviewed
CVE-2024-45046

PhpSpreadsheet HTML writer is vulnerable to Cross-Site Scripting via style information

Moderate severity GitHub Reviewed Published Aug 28, 2024 in PHPOffice/PhpSpreadsheet • Updated Aug 29, 2024

Package

composer phpoffice/phpspreadsheet (Composer)

Affected versions

< 2.1.0

Description

Summary

\PhpOffice\PhpSpreadsheet\Writer\Html doesn’t sanitize spreadsheet styling information such as font names, allowing an attacker to inject arbitrary JavaScript on the page.

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. An alert should be displayed.

Impact

Full takeover of the session of users viewing spreadsheet files as HTML.

References