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CVE-2023-48089

8.8 HIGH
Remote Code Execution

📋 TL;DR

xxl-job-admin 2.4.0 contains a remote code execution vulnerability in the /xxl-job-admin/jobcode/save endpoint. Attackers can execute arbitrary code on affected systems, potentially compromising the entire server. This affects all deployments running the vulnerable version of xxl-job-admin.

💻 Affected Systems

Products:
  • xxl-job-admin
Versions: 2.4.0
Operating Systems: All operating systems running xxl-job-admin
Default Config Vulnerable: ⚠️ Yes
Notes: The vulnerability exists in the default configuration of version 2.4.0. No special configuration is required for exploitation.

📦 What is this software?

Xxl Job by Xuxueli

View all CVEs affecting Xxl Job →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise allowing attackers to execute arbitrary commands, steal sensitive data, deploy ransomware, or pivot to other systems in the network.

🟠

Likely Case

Attackers gain shell access to the server, install backdoors, exfiltrate data, and potentially compromise other connected systems.

🟢

If Mitigated

Limited impact if proper network segmentation, least privilege, and monitoring are in place, though RCE still poses significant risk.

🌐 Internet-Facing: HIGH - The vulnerable endpoint is accessible via web interface, making internet-facing deployments extremely vulnerable to exploitation.
🏢 Internal Only: HIGH - Even internal deployments are at high risk from insider threats or compromised internal systems.

🎯 Exploit Status

Public PoC: ⚠️ Yes
Weaponized: LIKELY
Unauthenticated Exploit: ✅ No
Complexity: LOW

Exploitation requires authentication to the xxl-job-admin interface. The vulnerability is publicly documented with proof-of-concept details available.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.4.1 or later

Vendor Advisory: https://github.com/xuxueli/xxl-job/issues/3333

Restart Required: Yes

Instructions:

1. Upgrade xxl-job-admin to version 2.4.1 or later. 2. Replace the vulnerable jar/war file with the patched version. 3. Restart the xxl-job-admin service. 4. Verify the fix by checking the version and testing the vulnerable endpoint.

🔧 Temporary Workarounds

Network Access Control

linux

Restrict access to the xxl-job-admin interface using firewall rules or network segmentation.

iptables -A INPUT -p tcp --dport [xxl-job-port] -s [allowed-ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [xxl-job-port] -j DROP

Authentication Hardening

all

Implement strong authentication mechanisms and limit access to authorized users only.

🧯 If You Can't Patch

  • Implement strict network segmentation to isolate xxl-job-admin from critical systems
  • Deploy a web application firewall (WAF) with RCE protection rules

🔍 How to Verify

Check if Vulnerable:

Check if running xxl-job-admin version 2.4.0 by examining the application version in the admin interface or checking the deployed jar/war file version.

Check Version:

Check the xxl-job-admin web interface or examine the deployed application file (e.g., xxl-job-admin-2.x.x.jar)

Verify Fix Applied:

Verify the version has been updated to 2.4.1 or later in the admin interface or by checking the application files.

📡 Detection & Monitoring

Log Indicators:

  • Unusual POST requests to /xxl-job-admin/jobcode/save
  • Suspicious command execution patterns in system logs
  • Unexpected process creation from the xxl-job-admin service

Network Indicators:

  • Unusual outbound connections from the xxl-job-admin server
  • Traffic patterns indicating reverse shells or command execution

SIEM Query:

source="xxl-job-admin" AND (uri="/jobcode/save" OR command="*cmd*" OR process="*sh*")

📊 Metadata

CVE ID: CVE-2023-48089
CVSS v3 Score: 8.8 (HIGH)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: November 15, 2023
Last Updated: November 21, 2024

🔗 References

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