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<# | |
.SYNOPSIS | |
log4j-search.ps1 scans all local drives for presence of log4j jar files and analyzes the contents of the jar file to determine if it is vulnerable (CVE-2021-44228 and CVE-2021-45105) | |
.DESCRIPTION | |
Requires .Net4+ | |
Scans your local drives to identify vulnerable jar files (CVE-2021-44228 and CVE-2021-45105) | |
USAGE | |
.\log4j-search.ps1 | |
.\log4j-search.ps1 -verbose 1 #lists all matching log4j jar files | |
#> | |
param ( [bool]$verbose ) | |
Add-Type -AssemblyName System.IO.Compression | |
Add-Type -assembly system.io.compression.filesystem | |
$targetManifestFile = New-TemporaryFile | |
$log4Filter = "log4j*.jar" | |
$jarFiles = Get-PSDrive | Where-Object { $_.Name.length -eq 1 } | Select-Object -ExpandProperty Root | Get-ChildItem -File -Recurse -Filter $log4Filter -ErrorAction SilentlyContinue | Select-Object -ExpandProperty FullName | |
$global:result = $null | |
foreach ($jarFile in $jarFiles) { | |
$global:jndiExists = $false | |
$zip = [System.IO.Compression.ZipFile]::OpenRead($jarFile) | |
$zip.Entries | | |
Where-Object { $_.Name -like 'JndiLookup.class' } | ForEach-Object { | |
if ($null -eq $global:result) { $global:result = "NOT vulnerable but Jndi class found" } | |
$global:jndiExists = $true | |
} | |
$zip.Entries | | |
Where-Object { $_.FullName -eq 'META-INF/MANIFEST.MF' } | ForEach-Object { | |
[System.IO.Compression.ZipFileExtensions]::ExtractToFile($_, $targetManifestFile, $true) | |
try {$implementationVersion = (Get-Content $targetManifestFile | Where-Object { $_ -like 'Implementation-Version: *' }).ToString()} | |
catch {$implementationVersion = 'Implementation-Version: 0.0.0'} | |
Remove-Item $targetManifestFile -ErrorAction SilentlyContinue | |
$implementationVersion_ = $implementationVersion.Replace('Implementation-Version: ', '').Split('.') | |
if (([int]$implementationVersion_[0] -eq 2 -and [int]$implementationVersion_[1] -lt 15) -And !([int]$implementationVersion_[0] -eq 2 -and [int]$implementationVersion_[1] -lt 12 -and [int]$implementationVersion_[2] -eq 2) ) { | |
if ($global:jndiExists) { | |
Write-Output "$($jarFile.ToString()) $($implementationVersion.ToString()) - VULNERABLE to RCE" | |
$global:result = "Vulnerable" | |
} | |
} elseif (([int]$implementationVersion_[0] -eq 2 -and [int]$implementationVersion_[1] -lt 16 ) -and !([int]$implementationVersion_[0] -eq 2 -and [int]$implementationVersion_[1] -lt 12 -and [int]$implementationVersion_[2] -eq 3 ) -And ($jarFile.ToString() -match 'log4j-core') ) { | |
Write-Output "$($jarFile.ToString()) $($implementationVersion.ToString()) - VULNERABLE to DoS" | |
$global:result = "Vulnerable" | |
} elseif ($verbose) { | |
Write-Output "$($jarFile.ToString()) $($implementationVersion.ToString())" | |
} | |
} | |
} | |
if ($null -eq $global:result) { $global:result = "Not Vulnerable" } | |
Write-Host "This system is $global:result" |
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By default, the script will now only show jar files containing the jndi class that is older than version 2.15.
Use "-verbose 1" to show all matching log4j jar files including ones NOT containing the jndi class.