Created
December 14, 2021 16:37
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Log4Shell - Scan library versions on Windows - PowerShell
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Add-Type -AssemblyName System.IO.Compression | |
Add-Type -AssemblyName System.IO.Compression.FileSystem | |
$errorAction = "SilentlyContinue" | |
$logFolder = "C:\" | |
$logFileJson = "$logFolder\log4j-scanner-results.json" | |
$targetManifestFile = "$logFolder\log4j-manifest.txt" | |
$log4Filter = "log4j*.jar" | |
$jarFiles = Get-PSDrive | Where-Object { $_.Name.length -eq 1 } | Select-Object -ExpandProperty Root | Get-ChildItem -File -Recurse -Filter $log4Filter -ErrorAction $errorAction | Select-Object -ExpandProperty FullName | |
$global:result = $null | |
$resultJson = @{} | |
$jarFilesList = New-Object System.Collections.ArrayList | |
$resultJson.Add("hostname", $env:computername) | |
$resultJson.Add("date", (Get-Date -Format "MM/dd/yyyy HH:mm K")) | |
foreach ($jarFile in $jarFiles) { | |
$fileJson = @{} | |
$fileJson.Add("file", $jarFile) | |
$zip = [System.IO.Compression.ZipFile]::OpenRead($jarFile) | |
$zip.Entries | | |
Where-Object { $_.FullName -eq 'META-INF/MANIFEST.MF' } | ForEach-Object { | |
[System.IO.Compression.ZipFileExtensions]::ExtractToFile($_, $targetManifestFile, $true) | |
$implementationVersion = (Get-Content $targetManifestFile -ErrorAction $errorAction | Where-Object { $_ -like 'Implementation-Version: *' }).ToString() | |
# Get the version number | |
$version = $implementationVersion.Replace('Implementation-Version: ', '') | |
$fileJson.Add("version", $version) | |
Remove-Item $targetManifestFile -ErrorAction $errorAction | |
$implementationVersion_ = $implementationVersion.Replace('Implementation-Version: ', '').Split('.') | |
# Check if it is vulnerable using the library version | |
if ($implementationVersion_[0] -eq 2 -and $implementationVersion_ -lt 15 ) { | |
$fileJson.Add("vulnerable", $True) | |
$global:result = "Vulnerable" | |
} | |
else { | |
$fileJson.Add("vulnerable", $False) | |
} | |
} | |
if ($null -eq $global:result) { $global:result = "Jndi class not found" } | |
$jarFilesList.Add($fileJson) | |
} | |
# Save result on a JSON file | |
$resultJson.Add("jar_files", $jarFilesList) | |
$resultJson.Add("result", $global:result) | |
$resultJson | ConvertTo-Json -Depth 10 | Out-File $logFileJson | |
Write-Output "Result: $global:result" |
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