CVE-2024-42681: Xuxueli Xxl-job RCE Vulnerability

CVE-2024-42681 Overview

CVE-2024-42681 is an insecure permissions vulnerability in xxl-job version 2.4.1, a widely deployed distributed task scheduling platform maintained by Xuxueli. The flaw resides in the Sub-Task ID component and allows an authenticated remote attacker to execute arbitrary code on the scheduler host. Exploitation requires only low privileges and no user interaction. Successful attacks compromise the confidentiality, integrity, and availability of the affected system. The vulnerability is classified under CWE-276 (Incorrect Default Permissions) and CWE-277 (Insecure Inherited Permissions).

Critical Impact
Authenticated remote attackers can achieve arbitrary code execution on xxl-job 2.4.1 scheduler hosts through the Sub-Task ID component, enabling full host compromise.

Affected Products

Xuxueli xxl-job version 2.4.1
Deployments exposing the xxl-job-admin scheduler to authenticated users
Downstream applications embedding the vulnerable 2.4.1 release

Discovery Timeline

2024-08-15 - CVE-2024-42681 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2024-42681

Vulnerability Analysis

xxl-job is a Java-based distributed job scheduling framework used to orchestrate cron-style tasks across executor nodes. Version 2.4.1 exposes a Sub-Task ID handling path that fails to enforce proper permission checks on the caller. An attacker with a low-privileged administrator account can invoke this component to trigger execution of attacker-controlled task logic on the scheduler or downstream executor nodes.

Because the scheduler process typically runs with broad filesystem and network access, arbitrary code execution translates directly into full host compromise. From that foothold, an attacker can pivot into internal networks, extract job configuration secrets, or tamper with scheduled workflows that feed production systems.

Root Cause

The root cause is a missing authorization check on the Sub-Task ID handler. The component trusts the requester to reference only sub-tasks they legitimately own or manage, without validating the caller's effective permissions against the target sub-task. This aligns with the CWE-276 and CWE-277 classifications: default and inherited permissions on task objects are broader than the security model requires.

Attack Vector

Exploitation is network-based and requires authentication as a low-privileged user of the xxl-job-admin console. The attacker crafts a request that references a privileged Sub-Task ID and injects task parameters interpreted by the executor. Because the executor evaluates job configuration supplied through the admin API, malicious task definitions execute code in the context of the executor process. See the GitHub Issue #3516 Discussion for community analysis of the affected endpoint.

No verified public proof-of-concept is available at the time of writing, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2024-42681

Indicators of Compromise

Unexpected task or sub-task creation events in the xxl-job-admin audit log, especially from low-privileged accounts
Executor processes spawning shells, curl, wget, or scripting interpreters outside of documented job definitions
Outbound network connections from xxl-job executor hosts to unknown IP addresses or command-and-control infrastructure
Modifications to task GLUE source code (Groovy, Shell, Python, PHP) that were not initiated by change management

Detection Strategies

Inventory all xxl-job deployments and flag any instance reporting version 2.4.1 through banner or /xxl-job-admin metadata
Correlate authentication events with subsequent Sub-Task API calls to identify low-privileged accounts triggering privileged operations
Baseline normal child processes of the xxl-job executor JVM and alert on deviations such as /bin/sh, cmd.exe, or powershell.exe

Monitoring Recommendations

Forward xxl-job-admin application logs and executor process telemetry to a centralized SIEM for correlation
Alert on new GLUE task source updates or sub-task registrations occurring outside change windows
Monitor egress traffic from executor hosts and restrict it to known destinations required by scheduled jobs

How to Mitigate CVE-2024-42681

Immediate Actions Required

Restrict network access to the xxl-job-admin interface to trusted management networks and require VPN or bastion access
Audit all xxl-job user accounts and remove or downgrade accounts that do not require task management privileges
Rotate credentials and API tokens used by xxl-job administrators and executors, then review recent Sub-Task activity for anomalies
Run the xxl-job executor process under a dedicated, least-privileged service account with restricted filesystem and network scope

Patch Information

At the time of publication, no fixed vendor release is referenced in the NVD entry for CVE-2024-42681. Operators of version 2.4.1 should track the GitHub Issue #3516 Discussion and the upstream xxl-job repository for patched releases beyond 2.4.1. Upgrade to the latest stable release once a fix is confirmed and validate that the Sub-Task ID handler enforces authorization on every request.

Workarounds

Place xxl-job-admin behind an authenticating reverse proxy that enforces multi-factor authentication and IP allow-listing
Disable or gate script-based GLUE task types (Shell, Python, Groovy, PHP) that are not required for production workloads
Segment executor hosts on an isolated network segment with strict egress filtering to prevent lateral movement after compromise
Apply application-layer rate limiting and audit logging on Sub-Task management endpoints to slow abuse and improve detection

bash

# Example: restrict xxl-job-admin exposure with an nginx allow-list
location /xxl-job-admin/ {
    allow 10.0.0.0/24;      # management subnet
    deny all;
    proxy_pass http://127.0.0.1:8080/xxl-job-admin/;
    proxy_set_header X-Real-IP $remote_addr;
}