juicy-potato

# Juicy Potato (abusing the golden privileges) *A sugared version of [RottenPotatoNG][1], with a bit of juice, i.e. **another Local Privilege Escalation tool, from a Windows Service Accounts to NT AUTHORITY\SYSTEM*** ## Summary [RottenPotatoNG][1] and its [variants][6] leverages the privilege escalation chain based on [`BITS`][3] [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. We decided to weaponize [RottenPotatoNG][1]: **Say hello to Juicy Potato**. > For the theory, see [Rotten Potato - Privilege Escalation from Service Accounts to SYSTEM][4] and follow the chain of links and references. We discovered that, other than `BITS` there are a several COM servers we can abuse. They just need to: 1. be instantiable by the current user, normally a "service user" which has impersonation privileges 2. implement the `IMarshal` interface 3. run as an elevated user (SYSTEM, Administrator, ...) After some testing we obtained and tested an extensive list of [interesting CLSID's](CLSID/README.md) on several Windows versions. ## Juicy details JuicyPotato allows you to: + **Target CLSID**
_pick any CLSID you want. [Here](CLSID/README.md) you can find the list organized by OS._ + **COM Listening port**
_define COM listening port you prefer (instead of the marshalled hardcoded 6666)_ + **COM Listening IP address**
_bind the server on any IP_ + **Process creation mode**
_depending on the impersonated user's privileges you can choose from:_ - `CreateProcessWithToken` (needs `SeImpersonate`) - `CreateProcessAsUser` (needs `SeAssignPrimaryToken`) - `both` + **Process to launch**
_launch an executable or script if the exploitation succeeds_ + **Process Argument**
_customize the launched process arguments_ + **RPC Server address**
_for a stealthy approach you can authenticate to an external RPC server_ + **RPC Server port**
_useful if you want to authenticate to an external server and firewall is blocking port `135`..._ + **TEST mode**
_mainly for testing purposes, i.e. testing CLSIDs. It creates the DCOM and prints the user of token. See [here for testing](Test/README.md)_ ## Usage ``` T:\>JuicyPotato.exe JuicyPotato v0.1 Mandatory args: -t createprocess call: CreateProcessWithTokenW, CreateProcessAsUser, <*> try both -p : program to launch -l : COM server listen port Optional args: -m : COM server listen address (default 127.0.0.1) -a : command line argument to pass to program (default NULL) -k : RPC server ip address (default 127.0.0.1) -n : RPC server listen port (default 135) -c <{clsid}>: CLSID (default BITS:{4991d34b-80a1-4291-83b6-3328366b9097}) -z only test CLSID and print token's user ``` ## Example ## Final thoughts If the user has `SeImpersonate` or `SeAssignPrimaryToken` privileges then you are **SYSTEM**. It's nearly impossible to prevent the abuse of all these COM Servers. You could think to modify the permissions of these objects via `DCOMCNFG` but good luck, this is gonna be challenging. 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. ## Binaries [](https://ci.appveyor.com/project/ohpe/juicy-potato) An automatic build is available. Binaries can be downloaded from the Artifacts section [here](https://ci.appveyor.com/project/ohpe/juicy-potato/build/artifacts). Also available in [BlackArch](https://blackarch.org). ## Authors - [Andrea Pierini](https://twitter.com/decoder_it) - [Giuseppe Trotta](https://twitter.com/Giutro) ## References * [Rotten Potato - Privilege Escalation from Service Accounts to SYSTEM][4] * [Windows: DCOM DCE/RPC Local NTLM Reflection Elevation of Privilege][5] * [Potatoes and Tokens](https://decoder.cloud/2018/01/13/potato-and-tokens/) * [The lonely Potato](http://decoder.cloud/2017/12/23/the-lonely-potato/) * [Social Engineering the Windows Kernel by James Forshaw](https://www.slideshare.net/Shakacon/social-engineering-the-windows-kernel-by-james-forshaw) [1]: https://github.com/breenmachine/RottenPotatoNG [2]: https://decoder.cloud/2017/12/23/the-lonely-potato/ [3]: https://msdn.microsoft.com/en-us/library/windows/desktop/bb968799(v=vs.85).aspx [4]: https://foxglovesecurity.com/2016/09/26/rotten-potato-privilege-escalation-from-service-accounts-to-system/ [5]: https://bugs.chromium.org/p/project-zero/issues/detail?id=325&redir=1 [6]:https://github.com/decoder-it/lonelypotato