Merge pull request #564 from peass-ng/fix/issue-410-printnightmare

Check PrintNightmare PointAndPrint policy

linPEAS/builder/linpeas_parts/1_system_information/16_Protections.sh

@@ -30,7 +30,7 @@
 # Functions Used: echo_not_found, print_2title, print_list, warn_exec
 # Global Variables:
 # Initial Functions:
-# Generated Global Variables: $ASLR, $hypervisorflag, $detectedvirt, $unpriv_userns_clone, $perf_event_paranoid, $mmap_min_addr, $ptrace_scope, $dmesg_restrict, $kptr_restrict, $protected_symlinks, $protected_hardlinks, $unpriv_bpf_disabled
+# Generated Global Variables: $ASLR, $hypervisorflag, $detectedvirt, $unpriv_userns_clone, $perf_event_paranoid, $mmap_min_addr, $ptrace_scope, $dmesg_restrict, $kptr_restrict, $unpriv_bpf_disabled, $protected_symlinks, $protected_hardlinks
 # Fat linpeas: 0
 # Small linpeas: 0
 

winPEAS/winPEASexe/winPEAS/Checks/SystemInfo.cs

@@ -88,6 +88,7 @@ namespace winPEAS.Checks
                 PrintLocalGroupPolicy,
                 PrintPotentialGPOAbuse,
                 AppLockerHelper.PrintAppLockerPolicy,
+                PrintPrintNightmarePointAndPrint,
                 PrintPrintersWMIInfo,
                 PrintNamedPipes,
                 PrintNamedPipeAbuseCandidates,
@@ -836,6 +837,39 @@ namespace winPEAS.Checks
             }
         }
 
+        private static void PrintPrintNightmarePointAndPrint()
+        {
+            Beaprint.MainPrint("PrintNightmare PointAndPrint Policies");
+            Beaprint.LinkPrint("https://itm4n.github.io/printnightmare-exploitation/", "Check PointAndPrint policy hardening");
+
+            try
+            {
+                string key = @"Software\\Policies\\Microsoft\\Windows NT\\Printers\\PointAndPrint";
+                var restrict = RegistryHelper.GetDwordValue("HKLM", key, "RestrictDriverInstallationToAdministrators");
+                var noWarn = RegistryHelper.GetDwordValue("HKLM", key, "NoWarningNoElevationOnInstall");
+                var updatePrompt = RegistryHelper.GetDwordValue("HKLM", key, "UpdatePromptSettings");
+
+                if (restrict == null && noWarn == null && updatePrompt == null)
+                {
+                    Beaprint.NotFoundPrint();
+                    return;
+                }
+
+                Beaprint.NoColorPrint($"      RestrictDriverInstallationToAdministrators: {restrict}\n" +
+                                      $"      NoWarningNoElevationOnInstall: {noWarn}\n" +
+                                      $"      UpdatePromptSettings: {updatePrompt}");
+
+                if (restrict == 0 && noWarn == 1 && updatePrompt == 2)
+                {
+                    Beaprint.BadPrint("      [!] Potentially vulnerable to PrintNightmare misconfiguration");
+                }
+            }
+            catch (Exception ex)
+            {
+                Beaprint.PrintException(ex.Message);
+            }
+        }
+
         private static void PrintPrintersWMIInfo()
         {
             Beaprint.MainPrint("Enumerating Printers (WMI)");

winPEAS/winPEASps1/winPEAS.ps1

@@ -821,6 +821,34 @@ $Hotfix = Get-HotFix | Sort-Object -Descending -Property InstalledOn -ErrorActio
 $Hotfix | Format-Table -AutoSize
 
 
+# PrintNightmare PointAndPrint policy checks
+Write-Host ""
+if ($TimeStamp) { TimeElapsed }
+Write-Host -ForegroundColor Blue "=========|| PRINTNIGHTMARE POINTANDPRINT POLICY"
+$pnKey = "HKLM:\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint"
+if (Test-Path $pnKey) {
+  $pn = Get-ItemProperty -Path $pnKey -ErrorAction SilentlyContinue
+  $restrict = $pn.RestrictDriverInstallationToAdministrators
+  $noWarn = $pn.NoWarningNoElevationOnInstall
+  $updatePrompt = $pn.UpdatePromptSettings
+
+  Write-Host "RestrictDriverInstallationToAdministrators: $restrict"
+  Write-Host "NoWarningNoElevationOnInstall: $noWarn"
+  Write-Host "UpdatePromptSettings: $updatePrompt"
+
+  $hasAllValues = ($null -ne $restrict) -and ($null -ne $noWarn) -and ($null -ne $updatePrompt)
+  if (-not $hasAllValues) {
+    Write-Host "PointAndPrint policy values are missing or not configured" -ForegroundColor Gray
+  } elseif (($restrict -eq 0) -and ($noWarn -eq 1) -and ($updatePrompt -eq 2)) {
+    Write-Host "Potentially vulnerable to PrintNightmare misconfiguration" -ForegroundColor Red
+  } else {
+    Write-Host "PointAndPrint policy is not in the known risky configuration" -ForegroundColor Green
+  }
+} else {
+  Write-Host "PointAndPrint policy key not found" -ForegroundColor Gray
+}
+
+
 #Show all unique updates installed
 Write-Host ""
 if ($TimeStamp) { TimeElapsed }