Patch

CVE-2021-44228

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Vulnerability Overview

CVE Name

CVE-2021-44228

Severity

Critical

CVE Description

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who...

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

https://www.oracle.com/security-alerts/cpuapr2022.html

Date

19.04.2022

Script

Script Type

Remediation script

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🔒 Mitigation of JNDI Lookup in Log4j 2.x (CVE-2021-44228) This remediation script scans for and disables JNDI lookup functionality in Log4j 2.x without requiring an upgrade, mitigating the CVE-2021-44228 (Log4Shell) vulnerability. It provides a temporary solution for environments where upgrading is not immediately possible. 🔍 How it works: The script searches for all log4j-core*.jar files in the system and identifies the Log4j version. If a vulnerable 2.x version is detected, it disables JNDI lookups by modifying the JAR file to prevent exploitation. The process is automated and ensures the vulnerable feature is disabled without requiring a Log4j update. ⚠️ Why it matters: CVE-2021-44228 is a critical vulnerability that allows remote code execution. By disabling JNDI lookups, the primary exploitation path is closed, providing a temporary solution while upgrading to a secure version of Log4j is planned.

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$log4jJarPaths = Get-ChildItem -Path "C:\" -Recurse -Include "log4j-*.jar" -ErrorAction SilentlyContinue

if ($log4jJarPaths.Count -eq 0) {
    Write-Host "No Log4j installation detected."
    exit
}

foreach ($jarPath in $log4jJarPaths) {
    if ($jarPath.Name -match "log4j-(\d+\.\d+\.\d+)\.jar") {
        $log4jVersion = $Matches[1]

if ($log4jVersion.StartsWith("1")) {
            Write-Host "Log4j 1.x version detected: $log4jVersion at $($jarPath.FullName)"
            
            Write-Host "Disabling SocketServer class..."
            Add-Type -AssemblyName 'System.IO.Compression.FileSystem'
            [System.IO.Compression.ZipFile]::Open($jarPath.FullName, 'Update').Entries | Where-Object { $_.FullName -eq 'org/apache/log4j/net/SocketServer.class' } | ForEach-Object { $_.Delete() }
            Write-Host "SocketServer class removed from $($jarPath.FullName)"
        } else {
            Write-Host "Log4j version $log4jVersion is not 1.x, skipping..."
        }
    }
}

Write-Host "Mitigation complete for Log4j 1.x installations."

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Affected OS & Apps

Spectrum Power 7

Siemens

Identity Services Engine

Cisco

Xcode

Apple

4.8

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