How to check if MS17-010 has already been installed

UPDATE (16.05.2017 @ 21:06): This script should now work for all operating systems up to the current Windows 10 / Server 2016 build 14393.1198

UPDATE (15.05.2017 @ 22:15): There have been several reports that this script did not work on some Windows 2008 and 2016 servers. This was related to Get-HotFix, as it misses some installed updates. Hence, I added a second method to fetch all installed fixes… I guess this should be more stable…

Because of the current situation regarding WannaCry, I needed a simple solution to check if a system has already been patched against all the issues fixed in MS17-010. However, as there are different KB’s for the different operating systems, this is a lot more difficult than I first thought.

Hence, I updated a script I found on the internet so that it can be simply pasted into a PowerShell to check a system.

# Copy and paste this to a Powershell Window to check if MS17-010 has already been installed on this system

function checkForHotFix
{
 Write-Host "[*] MS17-010 Checker"
 Write-Host "[*] ++++++++++++++++++++++++++++++++++++++++++"
 Write-Host "[*] Starting check"

 # based on https://www.poweradmin.com/blog/how-to-check-for-ms17-010-and-other-hotfixes/
 # and on http://tomtalks.uk/2013/09/list-all-microsoftwindows-updates-with-powershell-sorted-by-kbhotfixid-get-microsoftupdate/

 # To find all Hotfixes of a security update copy the page content and
 # use http://regexr.com/ with the regex KB[0-9]{7} to extract them

 $hotfixes = "KB4013429","KB4012606","KB4013198","KB4012598","KB4012598","KB4012598","KB4012598","KB4012598","KB4012212","KB4012215","KB4012212","KB4012215","KB4012213","KB4012216","KB4012214","KB4012217","KB4012213","KB4012216","KB4012606","KB4013198","KB4013429","KB4013429","KB4016871", "KB4019472"

 Write-Host "[*] Querying installed HotFixes using method 1"
 $wu = new-object -com “Microsoft.Update.Searcher”
 
 $totalupdates = $wu.GetTotalHistoryCount()
 $all = $wu.QueryHistory(0,$totalupdates)
 
 # Define a new array to gather output
 $UpdateCollection= @()
 
 Foreach ($update in $all)
 {
 $string = $update.title
 
 $Regex = “KB\d*”
 $KB = $string | Select-String -Pattern $regex | Select-Object { $_.Matches }
 
 $output = New-Object -TypeName PSobject
 $output | add-member NoteProperty “HotFixID” -value $KB.‘ $_.Matches ‘.Value
 $output | add-member NoteProperty “Title” -value $string
 $UpdateCollection += $output
 
 }

 Write-Host "[*] Querying installed HotFixes using method 2" 
 Foreach ($hotfix in Get-Hotfix)
 {
 $output = New-Object -TypeName PSobject
 $output | add-member NoteProperty “HotFixID” -value $hotfix.HotFixID
 $output | add-member NoteProperty “Title” -value $hotfix.Description
 $UpdateCollection += $output 
 }
 
 Write-Host "[*] Check if any suitable HotFix was found"
 if ($UpdateCollection | Where-Object {$hotfixes -contains $_.HotfixID}) {
 $hotfixID = $UpdateCollection | Where-Object {$hotfixes -contains $_.HotfixID} | Select-Object -first 1 "HotFixID"
 Write-Host "[+] Hotfix"$hotfixID.HotFixID"installed - System is secure!" -foreground "green"
 } else {
 Write-Host "[-] No Hotfix found - System vulnerable!" -foreground "red"
 }
}
cls
checkForHotFix

# Also copy this comment - This makes it "autorun"

If a system has already been patched it looks like this:

If not, well there is a warning:

Maybe it’s of use for someone else…

Acknowledgment:

• Thanks to Markus for pointing out a missing KB
• Thanks to Hannes for spotting a typing error that caused the script to always report “vulnerable” even on patched systems.
• Thanks to Dustin (see comments) for pointing out another missing KB