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Fix regexp for XEE validation

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This commit is contained in:
MarkBaker 2015-04-29 22:41:54 +01:00
parent bc7028ae4e
commit 75bb9d7eda
2 changed files with 16 additions and 1 deletions
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2
Classes/PHPExcel/Reader/Abstract.php
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@ -235,7 +235,7 @@ abstract class PHPExcel_Reader_Abstract implements PHPExcel_Reader_IReader
*/
public function securityScan($xml)
{
$pattern = '/\0?<\0?!\0?E\0?N\0?T\0?I\0?T\0?Y\0?/';
$pattern = '/\\0?' . implode('\\0?', str_split('<!DOCTYPE')) . '\\0?/';
if (preg_match($pattern, $xml)) {
throw new PHPExcel_Reader_Exception('Detected use of ENTITY in XML, spreadsheet file load() aborted to prevent XXE/XEE attacks');
}

15
Classes/PHPExcel/Reader/HTML.php
View File

@ -515,5 +515,20 @@ class PHPExcel_Reader_HTML extends PHPExcel_Reader_Abstract implements PHPExcel_
return $this;
}
/**
* Scan theXML for use of <!ENTITY to prevent XXE/XEE attacks
*
* @param string $xml
* @throws PHPExcel_Reader_Exception
*/
public function securityScan($xml)
{
$pattern = '/\\0?' . implode('\\0?', str_split('<!ENTITY')) . '\\0?/';
if (preg_match($pattern, $xml)) {
throw new PHPExcel_Reader_Exception('Detected use of ENTITY in XML, spreadsheet file load() aborted to prevent XXE/XEE attacks');
}
return $xml;
}
}