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Prevent Upload of ZIP bombs #7407

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merged 2 commits into from
May 26, 2024
Merged

Prevent Upload of ZIP bombs #7407

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038dbbd
Added fix for zip bomb
tanmaypardeshi Apr 19, 2024
ada7a6d
Merge pull request #2 from openemr/master
tanmaypardeshi Apr 25, 2024
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28 changes: 26 additions & 2 deletions interface/super/manage_document_templates.php
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Original file line number Diff line number Diff line change
Expand Up @@ -99,8 +99,32 @@
die(xlt('Cannot determine a destination filename'));
}
$path_parts = pathinfo($form_dest_filename);
if (!in_array(strtolower($path_parts['extension'] ?? ''), array('odt', 'txt', 'docx', 'zip'))) {
die(text(strtolower($path_parts['extension'] ?? '')) . ' ' . xlt('filetype is not accepted'));
$extension = strtolower($path_parts['extension'] ?? '');

if (!in_array($extension, array('odt', 'txt', 'docx', 'zip'))) {
die(text($extension) . ' ' . xlt('filetype is not accepted'));
}

// Check if the uploaded file is a zip file
if ($extension === 'zip') {
$maxZipSize = 1048576; // 1 MB (adjust the size as needed)
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Is this making the max size just 1 MB ?

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(just checking; maybe is acceptable for manage_document_templates uploads)

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@tanmaypardeshi tanmaypardeshi May 29, 2024 •
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Yes! Making sure that if it a ZIP file, a size larger than 1MB can be denied (Although, this can be changed or even removed based on what the requirements are).

if ($_FILES['form_file']['size'] > $maxZipSize) {
die(xlt('Zip file size exceeds the maximum allowed size'));
}

// Check for nested zip files
$zip = new ZipArchive;
if ($zip->open($tmp_name) === true) {
for ($i = 0; $i < $zip->numFiles; $i++) {
$nestedFile = $zip->getNameIndex($i);
if (pathinfo($nestedFile, PATHINFO_EXTENSION) === 'zip') {
die(xlt('Nested zip files are not allowed'));
}
}
$zip->close();
} else {
die(xlt('Failed to open the zip file'));
}
}

$templatepath = "$templatedir/$form_dest_filename";
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