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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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source: https://www.securityfocus.com/bid/47309/info

eForum is prone to an arbitrary-file-upload vulnerability because the application fails to adequately sanitize user-supplied input.

An attacker can exploit this issue to upload arbitrary code and run it in the context of the webserver process.

eForum 1.1 is vulnerable; other versions may also be affected. 

if (isset($_FILES)) { //upload attachments
  ...snip...
   $invalidFileTypes = array('php', 'php3', 'php4', 'php5', 'exe', 'dll', 'so', 'htaccess');
   $uploaddir = $eforum->path.'/upload';
   $upfiles = $_FILES['efattachment'];
     foreach ($upfiles['name'] as $idx => $upname) {
       if ($upname != '') {
         $source = $upfiles['tmp_name'][$idx];
           if (is_uploaded_file($source)) {
             if (in_array($fmanager->FileExt($upname), $invalidFileTypes)) { continue; }