CVE-2025-41348: Iest Winplus SQLi Vulnerability

CVE-2025-41348 Overview

A SQL injection vulnerability has been identified in WinPlus v24.11.27, a software product developed by Informática del Este. This vulnerability allows an attacker to recover, create, update, and delete database content by sending a specially crafted POST request using the val1 and cont parameters in the /WinplusPortal/ws/sWinplus.svc/json/getacumper_post endpoint. The vulnerability poses a significant risk to data integrity and confidentiality for organizations using the affected software.

Critical Impact

Attackers can leverage this SQL injection vulnerability to gain unauthorized access to sensitive database information, modify critical data, or completely delete database contents, potentially leading to severe data breaches and operational disruptions.

Affected Products

• Iest WinPlus version 24.11.27
• WinPlus Portal web service component
• /WinplusPortal/ws/sWinplus.svc/json/getacumper_post endpoint

Discovery Timeline

• 2025-11-18 - CVE-2025-41348 published to NVD
• 2025-11-19 - Last updated in NVD database

Technical Details for CVE-2025-41348

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects the WinPlus Portal web service component. The vulnerability exists in the JSON-based web service endpoint that processes accumulated period data. When user-supplied input is passed through the val1 and cont parameters, the application fails to properly sanitize or parameterize the input before constructing SQL queries. This allows attackers with low-privilege access to inject arbitrary SQL commands that are executed directly against the backend database.

The network-accessible nature of this vulnerability means that any authenticated user with access to the web service can potentially exploit this flaw. The impact spans all three core security pillars—confidentiality, integrity, and availability—as attackers can read sensitive data, modify records, and delete information from the database.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries in the getacumper_post endpoint. User-controlled input from the val1 and cont POST parameters is directly concatenated or interpolated into SQL statements without proper sanitization, escaping, or the use of prepared statements. This classic SQL injection pattern allows attackers to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The attack is carried out over the network by sending malicious POST requests to the vulnerable endpoint. An attacker with low-privilege access can craft SQL injection payloads within the val1 and cont parameters. The web service at /WinplusPortal/ws/sWinplus.svc/json/getacumper_post processes these parameters and passes them to the database layer without adequate protection.

The exploitation does not require user interaction and can be performed with minimal complexity. Successful exploitation grants the attacker the ability to:

• Extract sensitive data from the database (data exfiltration)
• Modify existing records (data manipulation)
• Delete database contents (data destruction)
• Potentially escalate privileges depending on database configuration

Since no verified code examples are available for this vulnerability, the attack mechanism involves crafting malicious SQL syntax within the POST request body targeting the val1 and cont parameters. For additional technical context, refer to the INCIBE Security Notice for related security information on WinPlus.

Detection Methods for CVE-2025-41348

Indicators of Compromise

• Unusual POST requests to /WinplusPortal/ws/sWinplus.svc/json/getacumper_post containing SQL syntax such as UNION, SELECT, INSERT, UPDATE, DELETE, or comment sequences (--, /*)
• Abnormal database query patterns or unexpected query execution times
• Database error messages appearing in application logs or responses
• Unauthorized data modifications or deletions in WinPlus-related database tables
• Multiple failed or malformed requests originating from single source IPs targeting the vulnerable endpoint

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in POST requests to WinPlus endpoints
• Implement application-layer logging to capture and analyze all requests to the /WinplusPortal/ws/sWinplus.svc/json/getacumper_post endpoint
• Configure database audit logging to monitor for suspicious query patterns, especially those involving administrative operations or bulk data access
• Use intrusion detection systems (IDS) with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Enable verbose logging on the WinPlus Portal web service to capture full request bodies
• Monitor database server logs for unusual query execution patterns, particularly queries with injection characteristics
• Set up alerts for any database errors returned by the getacumper_post endpoint
• Track access patterns to the vulnerable endpoint and flag anomalous behavior such as high-frequency requests or requests from unexpected geolocations

How to Mitigate CVE-2025-41348

Immediate Actions Required

• Restrict network access to the /WinplusPortal/ws/sWinplus.svc/json/getacumper_post endpoint to trusted IP addresses only
• Implement input validation at the WAF or reverse proxy level to block requests containing SQL injection patterns
• Review and audit all accounts with access to the WinPlus Portal to ensure principle of least privilege
• Enable enhanced logging and monitoring on the affected endpoint to detect potential exploitation attempts
• Contact Informática del Este (Iest) for official patch availability information

Patch Information

As of the last NVD update on 2025-11-19, no official patch information has been published by the vendor. Organizations should monitor the Iest WinPlus product page and security advisories for updates regarding version 24.11.27 and subsequent releases that address this SQL injection vulnerability.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules specifically blocking SQL injection payloads in the val1 and cont parameters
• Implement network segmentation to limit exposure of the WinPlus Portal web service to only necessary internal networks
• Configure the reverse proxy or load balancer to inspect and sanitize incoming POST requests before they reach the application
• Consider disabling the vulnerable endpoint temporarily if the getacumper_post functionality is not business-critical

# Example WAF rule configuration (ModSecurity)
# Block SQL injection patterns in val1 and cont parameters
SecRule ARGS:val1 "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection attempt in val1'"
SecRule ARGS:cont "@detectSQLi" "id:1002,phase:2,deny,status:403,msg:'SQL Injection attempt in cont'"