Patch

CVE-2024-23897

with vRx

Vulnerability Overview

CVE Name

CVE-2024-23897

Severity

9.8

Critical

CVE Description

Jenkins 2.441 and earlier, LTS 2.426.2 and earlier does not disable a feature of its CLI command parser that replaces an '@' character followed by a file path in an argument with the file's contents, allowing unauthenticated attackers to read arbitrary files...

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Latest Patch info

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

Patch Name

Date

Script

Script Type

Remediation script

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🔒 Mitigating Jenkins CVE-2024-23897 by Disabling CLI This script is designed to mitigate the critical vulnerability CVE-2024-23897 in Jenkins by automatically locating the jenkins.war file on the system and restarting Jenkins with the CLI access disabled. The vulnerability allows unauthenticated attackers to read arbitrary files on the Jenkins controller, posing a significant security risk. This script provides an immediate, temporary solution to safeguard your Jenkins environment while you prepare for a full update. 🔍 How it works: Search for jenkins.war: The script first scans the entire system to locate the jenkins.war file, which is the core executable for Jenkins. Check Jenkins Status: It then checks if Jenkins is currently running. If it is, the script stops the Jenkins service. Apply Mitigation: The script restarts Jenkins with a critical configuration that disables the Command-Line Interface (CLI), preventing exploitation of the vulnerability. Monitor Execution: If Jenkins restarts successfully, the script confirms that the mitigation is in place. Otherwise, it prompts the user to check the logs for more details. ⚠️ Why it matters: The CVE-2024-23897 vulnerability is a serious security flaw that can allow attackers to read sensitive files on your Jenkins server, potentially leading to unauthorized data access and severe security breaches. Immediate action is necessary to mitigate the risk. This script provides a quick and automated way to disable the vulnerable CLI feature in Jenkins, reducing the attack surface until a more permanent solution, such as updating to a patched version, can be implemented.

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#!/bin/bash

find_jenkins_war() {
    echo "Searching for the jenkins.war file on the system..."
    JENKINS_WAR=$(sudo find / -name "jenkins.war" 2>/dev/null)

if [ -z "$JENKINS_WAR" ]; then
        echo "No jenkins.war file found on the system."
        exit 1
    else
        echo "jenkins.war file found at: $JENKINS_WAR"
    fi
}

configure_jenkins() {
    echo "Configuring Jenkins to mitigate CVE-2024-23897..."
    
    if pgrep -f "jenkins.war" > /dev/null; then
        echo "Jenkins is running. Stopping Jenkins..."
        sudo systemctl stop jenkins
    fi

echo "Restarting Jenkins with the necessary configurations..."

# Start Jenkins with the option to disable CLI
    sudo java -Djenkins.CLI.disabled=true -jar "$JENKINS_WAR" &

if [ $? -eq 0 ]; then
        echo "Jenkins started successfully with the CLI disabled."
    else
        echo "There was a problem starting Jenkins. Check the logs for more details."
        exit 1
    fi
}

find_jenkins_war
configure_jenkins

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Affected OS & Apps

Jenkins

4.8

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