CVE-2024-42681
📋 TL;DR
CVE-2024-42681 is an insecure permissions vulnerability in xxl-job v2.4.1 that allows remote attackers to execute arbitrary code via the Sub-Task ID component. This affects all deployments running the vulnerable version of xxl-job, a distributed task scheduling framework. Attackers can achieve remote code execution without authentication if the system is exposed.
💻 Affected Systems
- xxl-job
📦 What is this software?
Xxl Job by Xuxueli
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, allowing data theft, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to service disruption, data exfiltration, and potential ransomware deployment.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only affecting the xxl-job service itself.
🎯 Exploit Status
The GitHub issue shows exploitation details and the vulnerability is straightforward to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.2 or later
Vendor Advisory: https://github.com/xuxueli/xxl-job/issues/3516
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download xxl-job version 2.4.2 or later from official repository. 3. Replace vulnerable files with patched version. 4. Restart xxl-job service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict network access to xxl-job admin interface to trusted IPs only
iptables -A INPUT -p tcp --dport 8080 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
Authentication Enforcement
allEnsure strong authentication is enabled for all admin interfaces
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy web application firewall with RCE protection rules
🔍 How to Verify
Check if Vulnerable:
Check xxl-job version in admin interface or configuration files. Version 2.4.1 is vulnerable.Check Version:
curl -s http://xxl-job-host:port/xxl-job-admin/version | grep versionVerify Fix Applied:
Verify version is 2.4.2 or later and test Sub-Task ID functionality for proper permission checks.📡 Detection & Monitoring
Log Indicators:
- Unusual Sub-Task ID parameter values
- Unexpected process execution from xxl-job context
- Failed authentication attempts to admin interface
Network Indicators:
- Unusual outbound connections from xxl-job server
- HTTP requests with suspicious Sub-Task ID parameters
SIEM Query:
source="xxl-job" AND (event="task_execute" AND task_id="*;*" OR event="process_create" AND parent="xxl-job")