PHP Tutorials, PHP Security - Comments on PHP Classes blog post "PHP security exploit ..."

<!DOCTYPE HTML> <html lang="en"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <meta name="google-site-verification" content="koB0IMWgAHKwEXWyOGt9RPqYrJU-fKzpoOTwRnprhKo" /> <title>PHP Tutorials, PHP Security - Comments on PHP Classes blog post "PHP security exploit ..." - PHP Classes</title>  <style type="text/css"> *, .normal-size { font-size: 14px; } html, body, input[type=submit] { color: black; font-family: "helvetica" , sans-serif , arial , helvetica; overflow-x: hidden !important; } html, body { background-color: #ffffff; height: 100%; margin: 0px; } a:link, a:active { color: #090F15; text-decoration: none; border-bottom-style: dotted; border-bottom-width: 1px; } a:visited { color: #26394d; } a:hover, #logoPHP > a, #logoCompany > a, #topLogoPHP > a { border-bottom-style: none; } .left { float: left; } .right { float: right; } .clear { clear: both; } input[type=text] { border: none; outline: none; color: #333; background: #ffe; z-index: 90; font-size: 1em; font-weight: normal; 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I guess.. all security exploits only affect sites that use poorly written code. This is why it is necessary to alert people that write poorly written code. If this does not affect your sites, good. Otherwise, you may want to pay more attention to the techniques attackers may use. For instance, relying on the MIME type sent by the browser for an..."> <meta name="robots" content="noindex"> <meta property="fb:pages" content="114418241923267">  <script type="text/javascript"> //<![CDATA[ /* * contentLoader.js * * Get the latest version from: * * http://www.jsclasses.org/fast-content-loader * * @(#) $Id: contentLoader.js,v 1.17 2021/08/12 10:57:05 mlemos Exp $ * * * This LICENSE is in the BSD license style. * * * Copyright (c) 2010, Manuel Lemos * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of Manuel Lemos nor the names of his contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. 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height: 280px"> <tr class="even"><th nowrap="nowrap" align="right" width="1%">Subject:</th><td>PHP Tutorials, PHP Security</td></tr> <tr class="odd" valign="top"><th nowrap="nowrap" align="right" width="1%">Summary:</th><td>PHP Application Development AgileInfoways.com</td></tr> <tr class="even" valign="top"><th nowrap="nowrap" align="right" width="1%">Messages:</th><td>2</td></tr> <tr class="odd"><th nowrap="nowrap" align="right" width="1%">Author:</th><td>abigailscotty</td></tr> <tr class="even"><th nowrap="nowrap" align="right" width="1%">Date:</th><td>2014-05-12 11:46:53</td></tr> <tr class="odd"><th nowrap="nowrap" align="right" width="1%">Update:</th><td>2014-05-12 20:37:33</td></tr> <tr class="framed light" style="height: 99%"><td colspan="2"> </td></tr> </table> </td><td class="c640" style="width: 336px; height: 280px" valign="top"><script type="text/javascript"></script> </td></tr></table><script type="text/javascript">  </script> <table align="center" cellpadding="0" cellspacing="0"> <tr> <td valign="top" id="vertical_banner" style="width: 1px" class="c1025"> <script type="text/javascript">  </script> </td> <td valign="top"><div style="overflow: auto;"> <br /> <a name="message27"></a><table style="margin-bottom: 6px; " class="forum-message" cellpadding="4" cellspacing="0" align="center"> <tr> <td width="1%" class="nbgu"> </td> <td class="c499 nblu"><b>1. PHP Tutorials, PHP Security</b></td> <td class="nbgu"> </td> <td class="nbtu light"><a href="/post_forum_message.html?blog=PHP-Classes-blog&post=67&message=29643">Reply</a></td> <td class="nbgu"> </td> <td class="nbtu light"><a href="/report_forum_abuse.html?blog=PHP-Classes-blog&post=67&message=29643">Report abuse</a></td> <td width="98%" class="nbgu"> </td> </tr> </table>  <div align="center"><div class="forum-container"> <div class="framed dark"><img class="photo" src="https://files.phpclasses.org/graphics/unknown.gif" width="16" height="24" alt="Picture of abigailscotty" title="Picture of abigailscotty" align="top" loading="lazy"> abigailscotty - 2014-05-12 18:13:52</div> <div class="framed light forum-message">I guess.. all security exploits only affect sites that use poorly written code. This is why it is necessary to alert people that write poorly written code. If this does not affect your sites, good. Otherwise, you may want to pay more attention to the techniques attackers may use.<br /> <br /> For instance, relying on the MIME type sent by the browser for an uploaded file is not a reliable way to protect yourself, because that information comes from the browser and the attacker may spoof the content type.<br /> <br /> Even if you check the uploaded file extension, you may still be subject of the exploit. It depends on how you serve the uploaded files. As explained in the article, if you use include/require to serve uploaded GIF files, you may be triggering the execution malicious PHP code embedded in the GIF files.<br /> <br /> This may sound silly, but some developers use include and require to serve files that are not PHP scripts.<br /> <br /> Anyway, this exploit is not exactly old news. What is new is that it was discovered that is possible to craft a perfectly valid GIF file that embeds PHP code in the palette section of the image file.<br /> <br /> Since the image is valid, the PHP getimagesize will succeed. Many sites use getimagesize as the sole method to discard insecure files that are expected to be images. Alerting for this fact is the purpose of warning for this exploit possibility, as it was already used attack some PHP sites.<br /> <br /> James D.<br /> <code><a href="http://www.agileinfoways.com/technical-expertise/php-open-source-developments/php/" title="http://www.agileinfoways.com/technical-expertise/php-open-source-developments/php/" target="_blank" rel="nofollow noopener noreferer">agileinfoways.com/technical-experti</a></code> ...</div> </div></div> <br /> <a name="message28"></a><table style="margin-bottom: 6px; " class="forum-message" cellpadding="4" cellspacing="0" align="center"> <tr> <td width="1%" class="nbgu"> </td> <td class="c499 nblu"><b>2. Re: PHP Tutorials, PHP Security</b></td> <td class="nbgu"> </td> <td class="nbtu light"><a href="/post_forum_message.html?blog=PHP-Classes-blog&post=67&message=29651">Reply</a></td> <td class="nbgu"> </td> <td class="nbtu light"><a href="/report_forum_abuse.html?blog=PHP-Classes-blog&post=67&message=29651">Report abuse</a></td> <td width="98%" class="nbgu"> </td> </tr> </table>  <div align="center"><div class="forum-container"> <div class="framed dark"><img class="photo" src="https://files.phpclasses.org/picture/user/1.jpg" width="18" height="24" alt="Picture of Manuel Lemos" title="Picture of Manuel Lemos" align="top" loading="lazy"> Manuel Lemos - 2014-05-12 20:37:33 - <i>In reply to <a href="#message27">message 1</a> from abigailscotty</i></div> <div class="framed light forum-message">Exactly, unfortunately there are less experienced developers that confuse the purposes of PHP functions and use include or require where they should use readfile or similar functions that are meant just to read data, not PHP code.</div> </div></div> <br> </div></td> </tr> </table> <div class="c1025"><script type="text/javascript"></script> </div><script type="text/javascript"></script> <script type="text/javascript"></script> </div> <div class="BodyColumn"></div> </div> </div> </div> <div id="FooterInfo"> <div class="c1025"><div id="endnavigation"><table width="100%" style="margin-top: 6px; 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