CVE-2025-2106: WordPress ViralAd Plugin SQL Injection Flaw

CVE-2025-2106 Overview

CVE-2025-2106 is a SQL Injection vulnerability affecting the ArielBrailovsky-ViralAd plugin for WordPress. The vulnerability exists in the limpia() function, where the text and id parameters are insufficiently sanitized before being used in SQL queries. This allows unauthenticated attackers to inject malicious SQL statements that can extract sensitive information from the WordPress database.

Critical Impact

Unauthenticated attackers can exploit this SQL Injection vulnerability to extract sensitive data from the database, including user credentials, configuration data, and potentially other confidential information stored in WordPress.

Affected Products

• ArielBrailovsky-ViralAd WordPress Plugin versions up to and including 1.0.8
• WordPress installations running older versions (vulnerability appears exploitable primarily on legacy WordPress versions)

Discovery Timeline

• 2025-03-13 - CVE-2025-2106 published to NVD
• 2025-03-13 - Last updated in NVD database

Technical Details for CVE-2025-2106

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) stems from improper handling of user-supplied input in the limpia() function located in the plugin's anuncio.php file. The function fails to properly escape or parameterize the text and id parameters before incorporating them into SQL queries. This lack of input sanitization creates a classic SQL Injection attack surface that allows malicious actors to manipulate database queries.

The vulnerability is particularly concerning because it can be exploited without authentication, meaning any remote attacker with network access to the WordPress site can potentially leverage this flaw. However, the exploitability appears to be limited to older WordPress versions, which may provide some natural mitigation for sites running current WordPress core software.

Root Cause

The root cause of this vulnerability is insufficient input validation and the absence of prepared statements in the limpia() function. The function directly incorporates user-controlled data into SQL queries without proper escaping or parameterization, violating fundamental secure coding practices for database interactions. The vulnerable code can be found in the WordPress Plugin Code Reference.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the text or id parameters. When processed by the vulnerable limpia() function, these payloads are appended to existing SQL queries, allowing the attacker to:

• Extract sensitive database contents including user credentials
• Enumerate database structure and table information
• Potentially access data from other tables within the same database
• Gather information useful for further attacks against the WordPress installation

The attack is limited to data extraction (confidentiality impact) and does not appear to allow data modification or system availability disruption based on the vulnerability characteristics.

Detection Methods for CVE-2025-2106

Indicators of Compromise

• Unusual or malformed HTTP requests targeting the ArielBrailovsky-ViralAd plugin endpoints
• Database query logs showing unexpected SQL syntax or UNION-based injection patterns
• Web server access logs containing SQL keywords (SELECT, UNION, FROM, WHERE) in request parameters
• Failed login attempts or credential harvesting following suspected data exfiltration

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests
• Monitor WordPress plugin activity logs for anomalous behavior related to the ViralAd plugin
• Deploy database activity monitoring to identify suspicious query patterns or unauthorized data access
• Use SentinelOne Singularity to detect post-exploitation activities that may follow successful SQL injection

Monitoring Recommendations

• Enable verbose logging for the WordPress database to capture potentially malicious queries
• Configure alerts for high-volume requests to plugin endpoints that may indicate automated exploitation attempts
• Regularly audit WordPress plugin installations for outdated or vulnerable components
• Monitor network traffic for data exfiltration patterns following suspected SQL injection activity

How to Mitigate CVE-2025-2106

Immediate Actions Required

• Deactivate and remove the ArielBrailovsky-ViralAd plugin if it is not essential to site functionality
• Update WordPress core to the latest version to reduce exploitability
• Review database logs for signs of prior exploitation or unauthorized data access
• Implement WAF rules to block SQL injection attempts targeting this plugin

Patch Information

As of the last update, no official patch has been released for this vulnerability. Organizations using this plugin should consult the WordPress Plugin Overview page for updates. Additional details are available in the Wordfence Vulnerability Report.

Workarounds

• Remove or disable the ArielBrailovsky-ViralAd plugin until a security patch is available
• Implement input validation at the web server level using ModSecurity or similar WAF solutions
• Restrict access to WordPress admin and plugin functionality to trusted IP addresses where feasible
• Consider migrating to an alternative advertising plugin that is actively maintained and follows secure coding practices

# Example WAF rule to block SQL injection attempts (ModSecurity)
SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Detected'"