CVE-2023-4166: Tongda Office Anywhere SQLi Vulnerability

CVE-2023-4166 Overview

A critical SQL injection vulnerability has been identified in Tongda OA (Office Anywhere), a widely-used enterprise collaboration platform. This vulnerability exists in the file general/system/seal_manage/dianju/delete_log.php where improper handling of the DELETE_STR parameter allows attackers to inject malicious SQL statements. The exploit has been publicly disclosed and attackers can leverage this vulnerability remotely without authentication to compromise the confidentiality, integrity, and availability of affected systems.

Critical Impact

Unauthenticated attackers can execute arbitrary SQL commands against the database, potentially leading to complete data theft, modification, or destruction of the affected Tongda OA deployment.

Affected Products

• Tongda Office Anywhere versions prior to 11.10
• Tongda2000 Tongda Office Anywhere

Discovery Timeline

• 2023-08-05 - CVE-2023-4166 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-4166

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), one of the most dangerous web application security flaws. The vulnerable endpoint at general/system/seal_manage/dianju/delete_log.php fails to properly sanitize user-supplied input through the DELETE_STR parameter before incorporating it into SQL queries. This allows attackers to manipulate the underlying database queries by injecting malicious SQL code through HTTP requests.

The network-accessible attack vector combined with no required authentication or user interaction makes this vulnerability particularly dangerous. Successful exploitation grants attackers the ability to read, modify, or delete sensitive data from the database, potentially including user credentials, business documents, and other confidential information stored within the OA system.

Root Cause

The root cause of CVE-2023-4166 is insufficient input validation and the lack of parameterized queries in the delete_log.php file. The DELETE_STR parameter is directly concatenated into SQL statements without proper sanitization or escaping, creating a classic SQL injection vulnerability. This coding practice violates secure development principles and allows user-controlled input to alter the structure of database queries.

Attack Vector

The attack is conducted over the network by sending crafted HTTP requests to the vulnerable endpoint. An attacker can manipulate the DELETE_STR parameter to inject SQL commands that will be executed by the database server with the application's privileges. The attack does not require any authentication or user interaction, making it trivial to exploit at scale.

Common attack scenarios include:

• Extracting sensitive data using UNION-based injection techniques
• Bypassing authentication by manipulating query logic
• Modifying or deleting database records
• Potentially achieving code execution through database-specific functions like xp_cmdshell or INTO OUTFILE depending on database configuration

For technical details on the vulnerability, refer to the GitHub CVE Repository and VulDB advisory #236182.

Detection Methods for CVE-2023-4166

Indicators of Compromise

• HTTP requests to general/system/seal_manage/dianju/delete_log.php containing SQL keywords in the DELETE_STR parameter (e.g., UNION, SELECT, DROP, --, 'OR')
• Database error messages appearing in application logs indicating malformed queries
• Unusual database query patterns or execution times originating from the OA application
• Evidence of data exfiltration or unauthorized database access in audit logs

Detection Strategies

• Implement web application firewall (WAF) rules to detect SQL injection patterns targeting the DELETE_STR parameter
• Monitor web server access logs for requests to delete_log.php with suspicious query strings containing SQL metacharacters
• Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access
• Configure intrusion detection systems with signatures for known Tongda OA exploitation attempts

Monitoring Recommendations

• Enable verbose logging on web servers and database servers to capture detailed request information
• Establish baseline metrics for normal database query patterns and alert on significant deviations
• Regularly review database audit logs for unauthorized SELECT, UPDATE, or DELETE operations
• Monitor for outbound connections from database servers that could indicate data exfiltration

How to Mitigate CVE-2023-4166

Immediate Actions Required

• Upgrade Tongda OA to version 11.10 or later immediately to address this vulnerability
• Implement network segmentation to restrict access to the OA application from untrusted networks
• Deploy a web application firewall with SQL injection detection capabilities as an interim protection layer
• Review database logs for signs of prior exploitation and assess potential data compromise

Patch Information

The vendor has addressed this vulnerability in Tongda OA version 11.10. Organizations running affected versions should prioritize upgrading to the patched release. Note that the vendor did not respond to initial disclosure attempts, so no official advisory has been published. For additional information, consult VulDB #236182.

Workarounds

• Restrict network access to the vulnerable endpoint general/system/seal_manage/dianju/delete_log.php using firewall rules or web server access controls
• Implement input validation at the web application firewall level to block requests containing SQL injection patterns
• If the functionality is not required, consider disabling or removing the delete_log.php file temporarily until patching can be completed
• Apply database-level restrictions to limit the OA application's database user privileges to minimum required operations

# Example: Apache configuration to restrict access to vulnerable endpoint
<Location "/general/system/seal_manage/dianju/delete_log.php">
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
</Location>