Upload files to "Remediation"

2026-03-22 09:01:40 +00:00
commit 1b6e9c3156
2 changed files with 136 additions and 0 deletions
--- a/Remediation/Dell-BIOSPassword-Remediation.ps1
+++ b/Remediation/Dell-BIOSPassword-Remediation.ps1
@@ -0,0 +1,79 @@
+<#
+.SYNOPSIS
+    Remediation: Sets Dell BIOS Admin password using the wmisecurity provider.
+    Tries all known old passwords from Azure blob.
+#>
+
+# === CONFIG ===
+$NewPwdBlobUrl     = "https://stitbiosmgmt.blob.core.windows.net/mgmt/current-content.txt?sp=r&st=2026-02-26T08:49:58Z&se=2034-01-08T17:04:58Z&spr=https&sv=2024-11-04&sr=c&sig=zS74OfiIR93eSpFz68xnqW99UF0pJPLCoUIB7X5rnnM%3D"
+$OldPwdListBlobUrl = "https://stitbiosmgmt.blob.core.windows.net/mgmt/old-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"
+
+$LogPath = "$env:ProgramData\Dell\BiosConfig\BiosRemediation.log"
+New-Item -ItemType Directory -Path (Split-Path $LogPath) -Force | Out-Null
+Start-Transcript -Path $LogPath -Append
+
+Write-Output "$(Get-Date) - Starting BIOS password remediation (WMI Security)"
+
+# --- Fetch Passwords from Azure ---
+try {
+    $Base64New = (Invoke-RestMethod -Uri $NewPwdBlobUrl -Method Get).Trim()
+    $NewPassword = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Base64New))
+
+    $RawOld = Invoke-RestMethod -Uri $OldPwdListBlobUrl -Method Get
+    $OldPasswords = @()
+    foreach ($line in ($RawOld -split "`n")) {
+        $trimmed = $line.Trim()
+        if ($trimmed -eq "") { $OldPasswords += "" }
+        else { $OldPasswords += [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($trimmed)) }
+    }
+} catch {
+    Write-Output "Failed to fetch passwords from Azure."
+    Stop-Transcript; exit 1
+}
+
+# --- Connect to WMI ---
+try {
+    $SecurityInterface = Get-WmiObject -Namespace "root\dcim\sysman\wmisecurity" -Class "SecurityInterface" -ErrorAction Stop
+    $PasswordObject    = Get-CimInstance -Namespace "root\dcim\sysman\wmisecurity" -ClassName "PasswordObject" | Where-Object NameId -eq "Admin"
+    $Encoder = New-Object System.Text.UTF8Encoding
+} catch {
+    Write-Output "WMI Security classes not found."
+    Stop-Transcript; exit 1
+}
+
+# --- Logic: Set or Change ---
+$IsSet = $PasswordObject.IsPasswordSet -eq 1
+$Success = $false
+
+foreach ($OldPwd in $OldPasswords) {
+    $MaskedOld = if ($OldPwd -eq "") { "EMPTY" } else { "REDACTED" }
+    Write-Output "Attempting to apply password (OldPwd: $MaskedOld)"
+
+    try {
+        if (-not $IsSet) {
+            # Case: No password currently set
+            $Result = $SecurityInterface.SetNewPassword(0, 0, 0, "Admin", "", $NewPassword)
+        } else {
+            # Case: Password is set, attempting change
+            $OldBytes = $Encoder.GetBytes($OldPwd)
+            $Result = $SecurityInterface.SetNewPassword(1, $OldBytes.Length, $OldBytes, "Admin", $OldPwd, $NewPassword)
+        }
+
+        if ($Result.Status -eq 0) {
+            Write-Output "Success! BIOS Admin password updated."
+            $Success = $true
+            break
+        } else {
+            Write-Output "Failed with status: $($Result.Status)"
+        }
+    } catch {
+        Write-Output "Error during WMI call: $_"
+    }
+}
+
+if ($Success) {
+    Stop-Transcript; exit 0
+} else {
+    Write-Output "All old password candidates failed."
+    Stop-Transcript; exit 1
+}