CVE-2025-8963: Jeecg Jimureport RCE Vulnerability

CVE-2025-8963 Overview

A deserialization vulnerability has been identified in JeecgBoot JimuReport up to version 2.1.1. This vulnerability affects the /drag/onlDragDataSource/testConnection endpoint within the Data Large Screen Template component. Improper handling of serialized data allows attackers to potentially execute arbitrary operations through maliciously crafted requests. The vendor has acknowledged this issue and stated that it will be addressed in the next version update.

Critical Impact

Remote attackers with low privileges can exploit insecure deserialization in JimuReport's Data Large Screen Template component, potentially leading to unauthorized data access or system compromise.

Affected Products

• JeecgBoot JimuReport versions up to and including 2.1.1
• Jeecg JimuReport Data Large Screen Template component
• Systems utilizing the /drag/onlDragDataSource/testConnection endpoint

Discovery Timeline

• 2025-08-14 - CVE-2025-8963 published to NVD
• 2025-10-17 - Last updated in NVD database

Technical Details for CVE-2025-8963

Vulnerability Analysis

This vulnerability stems from improper handling of deserialization operations within JimuReport's Data Large Screen Template functionality. The affected endpoint /drag/onlDragDataSource/testConnection processes serialized data without adequate validation, allowing attackers to inject malicious serialized objects. Deserialization vulnerabilities of this nature can enable attackers to manipulate application logic, access sensitive information, or potentially achieve code execution depending on the gadget chains available within the application's classpath.

The vulnerability is associated with CWE-502 (Deserialization of Untrusted Data) and CWE-20 (Improper Input Validation), indicating that the application fails to properly validate incoming serialized data before processing it.

Root Cause

The root cause of this vulnerability is the insecure handling of deserialization operations within the testConnection functionality. The application does not adequately validate or sanitize serialized input data before deserializing it, allowing attackers to craft malicious payloads that are processed by the application. This type of vulnerability typically occurs when applications trust serialized data from untrusted sources without implementing proper security controls such as input validation, type filtering, or using safe deserialization methods.

Attack Vector

The attack can be launched remotely over the network against the vulnerable endpoint. An attacker with low privileges can send specially crafted serialized data to the /drag/onlDragDataSource/testConnection endpoint. The vulnerability does not require user interaction and can be exploited directly against the target system. The affected endpoint is part of the Data Large Screen Template component, which handles data source connection testing functionality.

The vulnerability mechanism involves sending malicious serialized objects through the testConnection endpoint. When the application deserializes this untrusted input, it can instantiate arbitrary objects, potentially leading to unauthorized operations. For detailed technical information about this vulnerability, refer to GitHub Issue #4010.

Detection Methods for CVE-2025-8963

Indicators of Compromise

• Unusual HTTP POST requests to the /drag/onlDragDataSource/testConnection endpoint with large or encoded payloads
• Suspicious serialized Java objects in request bodies containing known gadget chain class names
• Error messages or stack traces in logs indicating deserialization failures with unexpected object types
• Unexpected process spawning or network connections originating from the JimuReport application

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing common Java deserialization payloads
• Monitor application logs for deserialization exceptions or errors involving unexpected class instantiation
• Deploy runtime application self-protection (RASP) solutions to detect and block deserialization attacks in real-time
• Use SentinelOne Singularity Platform to monitor for post-exploitation behaviors such as unusual process execution or lateral movement

Monitoring Recommendations

• Enable detailed logging for the /drag/onlDragDataSource/testConnection endpoint and related data source operations
• Configure alerts for high volumes of requests to the vulnerable endpoint from single sources
• Monitor system resources for unexpected spikes that may indicate exploitation attempts
• Review audit logs regularly for unauthorized configuration changes or data access patterns

How to Mitigate CVE-2025-8963

Immediate Actions Required

• Restrict access to the /drag/onlDragDataSource/testConnection endpoint using network-level controls or authentication requirements
• Implement input validation and filtering on the affected endpoint to reject suspicious serialized data
• Apply the principle of least privilege by limiting user access to the Data Large Screen Template functionality
• Monitor for vendor updates and prepare to apply the patch when the next version is released

Patch Information

The vendor has acknowledged this vulnerability through GitHub Issue #4010 and has stated: "Modified, next version updated." Organizations should monitor for the release of JimuReport versions beyond 2.1.1 and apply updates as soon as they become available. Additional information about this vulnerability can be found at VulDB #319958.

Workarounds

• Disable the Data Large Screen Template feature or the affected testConnection endpoint if not required for business operations
• Implement network segmentation to limit access to JimuReport instances from trusted networks only
• Deploy a reverse proxy with request inspection capabilities to filter potentially malicious deserialization payloads
• Consider implementing a Java agent-based deserialization filter to block dangerous class instantiation at the JVM level

# Example: Restrict access to vulnerable endpoint via nginx
location /drag/onlDragDataSource/testConnection {
    # Deny all access until patch is applied
    deny all;
    # Or restrict to specific trusted IPs
    # allow 192.168.1.0/24;
    # deny all;
}