CVE-2013-5673 in Testimonial plugin
Summary
by MITRE
SQL injection vulnerability in testimonial.php in the IndiaNIC Testimonial plugin 2.2 for WordPress allows remote attackers to execute arbitrary SQL commands via the custom_query parameter in a testimonial_add action to wp-admin/admin-ajax.php.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/09/2025
The CVE-2013-5673 vulnerability represents a critical SQL injection flaw within the IndiaNIC Testimonial plugin version 2.2 for WordPress platforms. This vulnerability specifically targets the testimonial.php component and exploits a lack of proper input validation within the custom_query parameter. The flaw exists within the wp-admin/admin-ajax.php endpoint which handles administrative AJAX requests, making it particularly dangerous as it allows attackers to bypass standard WordPress authentication mechanisms and directly manipulate the database through the plugin's testimonial management functionality.
The technical implementation of this vulnerability stems from improper sanitization of user-supplied input within the testimonial_add action handler. When the custom_query parameter is processed without adequate escaping or validation, malicious SQL code can be injected and executed within the database context. This occurs because the plugin fails to implement proper parameterized queries or input filtering mechanisms that would normally prevent such injection attacks. The vulnerability is classified under CWE-89 which specifically addresses SQL injection weaknesses in software applications. Attackers can leverage this flaw to execute unauthorized database operations including data extraction, modification, or deletion, potentially leading to complete database compromise.
The operational impact of CVE-2013-5673 extends beyond simple data theft as it provides attackers with a pathway to establish persistent access within compromised WordPress environments. Successful exploitation can result in full administrative control over the affected WordPress site, enabling attackers to modify content, inject malicious code, or establish backdoor access. The vulnerability is particularly concerning in WordPress environments where multiple plugins are installed, as it can serve as a stepping stone for further attacks against the broader web application infrastructure. This aligns with ATT&CK technique T1078 which covers legitimate credentials usage, as compromised WordPress installations can be used for broader network infiltration activities.
Mitigation strategies for this vulnerability require immediate plugin updates to versions that address the SQL injection flaw, as the original IndiaNIC Testimonial plugin version 2.2 contained no built-in protections against such attacks. System administrators should implement comprehensive input validation and output encoding mechanisms, particularly for all parameters processed through AJAX endpoints. The implementation of web application firewalls and database query monitoring can provide additional layers of protection by detecting and blocking suspicious SQL patterns. Regular security auditing of WordPress plugins and themes remains essential, as this vulnerability demonstrates the importance of proper input sanitization practices. Organizations should also consider implementing least-privilege database access controls and regular backup procedures to minimize potential damage from successful exploitation attempts.