CVE-2025-8806: Zhilink ADP Platform SQL Injection Flaw

CVE-2025-8806 Overview

A SQL Injection vulnerability has been identified in Zhilink ADP Application Developer Platform version 1.0.0. The vulnerability exists in the /adpweb/a/sys/office/treeData endpoint, where improper handling of the extId parameter allows attackers to inject malicious SQL commands. This flaw enables remote authenticated attackers to manipulate database queries, potentially leading to unauthorized data access, data modification, or data destruction.

Critical Impact

Remote attackers with low privileges can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially escalate their access within the application's backend systems.

Affected Products

• Zhilink ADP Application Developer Platform 1.0.0
• Applications built on the affected platform version

Discovery Timeline

• 2025-08-10 - CVE-2025-8806 published to NVD
• 2025-10-06 - Last updated in NVD database

Technical Details for CVE-2025-8806

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) represents a failure in input validation within the Zhilink ADP Application Developer Platform. The affected endpoint /adpweb/a/sys/office/treeData accepts user-supplied input through the extId parameter without proper sanitization or parameterized query implementation. This allows attackers to inject arbitrary SQL statements that are executed by the database server.

The vulnerability is classified under both CWE-89 (SQL Injection) and CWE-74 (Injection), indicating that the application fails to properly neutralize special elements used in SQL commands before incorporating user input into database queries. The attack requires network access and low-level privileges, making it accessible to authenticated users who may seek to escalate their access or exfiltrate data.

The exploit has been publicly disclosed, and proof-of-concept details are available. The vendor was contacted prior to public disclosure but did not respond, leaving affected systems without an official patch.

Root Cause

The root cause of CVE-2025-8806 is inadequate input validation and failure to implement parameterized queries or prepared statements in the database access layer. The extId parameter value is directly concatenated into SQL queries without proper escaping or sanitization, allowing malicious SQL syntax to be interpreted as part of the query structure rather than as data.

Attack Vector

The attack can be initiated remotely over the network by any authenticated user with access to the vulnerable endpoint. An attacker crafts a malicious request to the /adpweb/a/sys/office/treeData endpoint with SQL injection payloads embedded in the extId parameter. When the server processes this request, the injected SQL code is executed against the backend database, potentially allowing the attacker to:

• Extract sensitive information from database tables
• Modify or delete existing data records
• Bypass authentication or authorization controls
• Execute administrative operations on the database

The vulnerability requires low privileges and no user interaction, making it straightforward to exploit once an attacker has basic access to the application.

Detection Methods for CVE-2025-8806

Indicators of Compromise

• Unusual SQL error messages in application logs referencing the /adpweb/a/sys/office/treeData endpoint
• HTTP requests to the affected endpoint containing SQL keywords such as UNION, SELECT, DROP, INSERT, or comment sequences (--, /**/)
• Database query logs showing unexpected queries originating from the tree data functionality
• Abnormal data access patterns or bulk data extraction from the affected application

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the extId parameter
• Monitor application logs for requests to /adpweb/a/sys/office/treeData containing suspicious characters such as single quotes, semicolons, or SQL keywords
• Deploy database activity monitoring to detect anomalous query patterns from the application server
• Use intrusion detection systems (IDS) configured with SQL injection signature rules

Monitoring Recommendations

• Enable verbose logging for the affected endpoint and review logs regularly for injection attempts
• Configure alerts for HTTP 500 errors or database errors associated with the tree data endpoint
• Implement real-time monitoring of database query execution times to detect time-based SQL injection techniques
• Set up network traffic analysis to identify unusual outbound data transfers that may indicate data exfiltration

How to Mitigate CVE-2025-8806

Immediate Actions Required

• Restrict access to the /adpweb/a/sys/office/treeData endpoint to only essential users until a patch is available
• Implement a Web Application Firewall (WAF) with SQL injection protection rules in front of the affected application
• Review and audit all user accounts with access to the affected functionality
• Consider disabling the vulnerable endpoint if the functionality is not critical to operations

Patch Information

No official patch is currently available from the vendor. According to the vulnerability disclosure, the vendor (Zhilink 智互联(深圳)科技有限公司) was contacted early about this issue but did not respond. Organizations should monitor VulDB for updates regarding patches or vendor responses. Until a patch is released, implement the workarounds and mitigation measures described below.

Workarounds

• Deploy a Web Application Firewall (WAF) configured to block SQL injection patterns targeting the extId parameter
• Implement network-level access controls to restrict access to the application from trusted IP addresses only
• Add server-side input validation to sanitize the extId parameter before database operations (requires custom code modification)
• Place the application behind a reverse proxy that filters malicious request patterns
• Consider implementing virtual patching through security tools that can intercept and sanitize the vulnerable parameter

# Example WAF rule configuration (ModSecurity)
# Block SQL injection attempts on the affected endpoint
SecRule REQUEST_URI "@contains /adpweb/a/sys/office/treeData" \
    "id:1001,phase:2,deny,status:403,\
    chain"
SecRule ARGS:extId "@detectSQLi" \
    "t:none,t:urlDecodeUni,\
    msg:'SQL Injection Attempt Blocked - CVE-2025-8806'"