CVE-2017-17871 in JEXTN Question And Answer Extension
Summary
by MITRE
The "JEXTN Question And Answer" extension 3.1.0 for Joomla! has SQL Injection via the an parameter in a view=tags action, or the ques-srch parameter.
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Analysis
by VulDB Data Team • 09/07/2025
The CVE-2017-17871 vulnerability represents a critical SQL injection flaw within the JEXTN Question And Answer extension version 3.1.0 for Joomla! platforms. This vulnerability stems from inadequate input validation and sanitization mechanisms within the extension's codebase, specifically affecting the parameter handling logic in two distinct attack vectors. The flaw manifests when user-supplied data is directly incorporated into database queries without proper escaping or parameterization, creating an exploitable entry point for malicious actors seeking to manipulate the underlying database infrastructure.
The technical implementation of this vulnerability occurs through two primary pathways within the extension's web interface. The first vector involves the 'an' parameter within the 'view=tags' action, while the second pathway utilizes the 'ques-srch' parameter. Both parameters are processed without adequate sanitization measures, allowing attackers to inject malicious SQL commands that can be executed within the context of the database connection. This lack of input validation creates a direct pathway for attackers to bypass authentication mechanisms, extract sensitive data, modify database contents, or even escalate privileges within the compromised Joomla! environment. The vulnerability aligns with CWE-89, which categorizes SQL injection as a fundamental weakness in software design and implementation practices.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with extensive control over the affected Joomla for content management, as the vulnerability affects the core database interaction mechanisms that underpin the platform's functionality and security posture. This vulnerability directly maps to ATT&CK technique T1071.004, which covers application layer protocol manipulation, and T1046, representing network service scanning that can lead to database exploitation.
Mitigation strategies for CVE-2017-17871 should prioritize immediate patching of the affected JEXTN Question And Answer extension to version 3.1.1 or later, which contains the necessary security fixes. Organizations should also implement input validation at multiple layers, including web application firewalls and database-level protections, to prevent malformed SQL queries from reaching the database engine. Network segmentation and access control measures can limit the potential impact of successful exploitation attempts, while regular security audits and code reviews should be conducted to identify similar vulnerabilities in other third-party extensions. Database administrators should monitor for unusual query patterns and implement proper privilege management to limit the damage that could result from successful SQL injection attacks. Additionally, implementing proper logging and monitoring mechanisms will aid in detecting and responding to exploitation attempts, while regular security assessments should be performed to ensure comprehensive protection against similar vulnerabilities in the broader Joomla! ecosystem.