CVE-2019-25359: SD.NET RIM SQLi Vulnerability

CVE-2019-25359 Overview

CVE-2019-25359 is a SQL injection vulnerability affecting SD.NET RIM versions before 4.7.3c. The vulnerability allows attackers to inject malicious SQL statements through POST parameters idtyp and idgremium. Attackers can exploit this vulnerability by crafting specially formed POST requests to the /vorlagen/ endpoint, enabling unauthorized database manipulation and potential information disclosure.

Critical Impact

Unauthenticated attackers can execute arbitrary SQL queries against the backend database, potentially leading to full database compromise, unauthorized data access, and modification of sensitive records.

Affected Products

• SD.NET RIM versions prior to 4.7.3c

Discovery Timeline

• 2026-02-18 - CVE CVE-2019-25359 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25359

Vulnerability Analysis

This SQL injection vulnerability exists in SD.NET RIM's /vorlagen/ endpoint, which fails to properly sanitize user-supplied input in POST parameters. When a user submits data via the idtyp or idgremium parameters, the application directly incorporates this input into SQL queries without adequate validation or parameterization.

The vulnerability is network-accessible, requiring no authentication or user interaction to exploit. This characteristic makes it particularly dangerous, as attackers can remotely target vulnerable instances without needing valid credentials. Successful exploitation allows attackers to read sensitive data from the database and potentially modify existing records, though the impact on system availability appears limited.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries in the application's handling of POST parameters. The idtyp and idgremium parameters are directly concatenated into SQL statements, allowing attackers to break out of the intended query context and inject arbitrary SQL code.

This represents a classic SQL injection pattern where user-controlled data is trusted and incorporated into database queries without proper escaping or use of prepared statements.

Attack Vector

The attack vector involves sending crafted HTTP POST requests to the /vorlagen/ endpoint with malicious SQL payloads embedded in the idtyp or idgremium parameters. An attacker can manipulate these parameters to:

1. Extract sensitive data from the database using UNION-based or blind SQL injection techniques
2. Modify existing database records to alter application behavior
3. Enumerate database structure and contents for further exploitation

The attack can be conducted remotely over the network without requiring any prior authentication, making exposed SD.NET RIM installations vulnerable to opportunistic attacks.

Detection Methods for CVE-2019-25359

Indicators of Compromise

• Unusual HTTP POST requests targeting the /vorlagen/ endpoint containing SQL syntax characters such as single quotes, semicolons, or UNION statements
• Database error messages appearing in application logs or responses indicating malformed SQL queries
• Unexpected database queries in database audit logs, particularly those accessing multiple tables or using UNION operations

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block common SQL injection patterns in POST parameters
• Monitor application access logs for anomalous requests to the /vorlagen/ endpoint with suspicious parameter values
• Implement database activity monitoring to detect unusual query patterns or unauthorized data access

Monitoring Recommendations

• Enable detailed logging on the web server to capture all POST request parameters
• Configure database audit logging to track all queries executed against the backend database
• Set up alerting for requests containing SQL injection signatures targeting the idtyp and idgremium parameters

How to Mitigate CVE-2019-25359

Immediate Actions Required

• Upgrade SD.NET RIM to version 4.7.3c or later, which addresses this SQL injection vulnerability
• If immediate patching is not possible, implement WAF rules to filter malicious input targeting the /vorlagen/ endpoint
• Review database access logs for signs of prior exploitation and assess potential data exposure

Patch Information

The vendor has released SD.NET RIM version 4.7.3c which addresses this SQL injection vulnerability. Organizations should prioritize upgrading to this version or later. Additional information is available in the Sitzungsdienst Release Note and the Vulncheck Advisory.

Workarounds

• Deploy a web application firewall with SQL injection protection rules in front of the SD.NET RIM application
• Restrict network access to the /vorlagen/ endpoint to trusted IP addresses only
• Implement input validation at the network perimeter to block requests containing SQL metacharacters in POST parameters