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Remediation/Dell-BIOSPassword-Detection.ps1

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+<#
+.SYNOPSIS
+    Detection: Checks if Dell BIOS Admin password is set and matches current expected password.
+    Uses the root\dcim\sysman\wmisecurity namespace.
+#>
+
+# === CONFIG ===
+$NewPwdBlobUrl = "https://stitbiosmgmt.blob.core.windows.net/mgmt/current-content.txt?sp=r&st=2026-02-26T08:49:58Z&se=2034-01-08T17:04:58Z&spr=https&sv=2024-11-04&sr=c&sig=zS74OfiIR93eSpFz68xnqW99UF0pJPLCoUIB7X5rnnM%3D"
+
+# --- Dell check ---
+if ((Get-CimInstance -ClassName Win32_ComputerSystem).Manufacturer -notlike "*Dell*") { exit 0 }
+
+# --- Fetch current expected password from Azure ---
+try {
+    $Base64NewPwd = (Invoke-RestMethod -Uri $NewPwdBlobUrl -Method Get).Trim()
+    $NewPassword = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Base64NewPwd))
+} catch {
+    Write-Output "Failed to fetch password from Azure."
+    exit 1
+}
+
+# --- Check if Admin Password is set ---
+try {
+    $PwdObj = Get-CimInstance -Namespace "root\dcim\sysman\wmisecurity" -ClassName "PasswordObject" -ErrorAction Stop | 
+              Where-Object { $_.NameId -eq "Admin" }
+    
+    if ($PwdObj.IsPasswordSet -ne 1) {
+        Write-Output "Admin password is NOT set. Non-compliant."
+        exit 1
+    }
+} catch {
+    Write-Output "WMI Security namespace not found."
+    exit 1
+}
+
+# --- Verify it matches the NEW password ---
+# We use the SecurityInterface to attempt a "verify" (setting the password to itself)
+try {
+    $SecurityInterface = Get-WmiObject -Namespace "root\dcim\sysman\wmisecurity" -Class "SecurityInterface"
+    $Encoder = New-Object System.Text.UTF8Encoding
+    $PwdBytes = $Encoder.GetBytes($NewPassword)
+
+    # SetNewPassword(IsChange, PwdLen, PwdBytes, PwdType, OldPwd, NewPwd)
+    # PwdType: "Admin"
+    $Result = $SecurityInterface.SetNewPassword(1, $PwdBytes.Length, $PwdBytes, "Admin", $NewPassword, $NewPassword)
+
+    if ($Result.Status -eq 0) {
+        Write-Output "Admin password matches current expected value. Compliant."
+        exit 0
+    } else {
+        Write-Output "Admin password is set but does NOT match current expected value. Non-compliant."
+        exit 1
+    }
+} catch {
+    Write-Output "Verification call failed."
+    exit 1
+}