CVE-2017-15381 in E-Sic
Summary
by MITRE
SQL Injection exists in E-Sic 1.0 via the f parameter to esiclivre/restrito/inc/buscacep.php (aka the zip code search script).
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Analysis
by VulDB Data Team • 11/30/2019
The vulnerability identified as CVE-2017-15381 represents a critical SQL injection flaw within the E-Sic 1.0 web application, specifically targeting the zip code search functionality. This vulnerability resides in the esiclivre/restrito/inc/buscacep.php script where the f parameter is improperly handled, allowing malicious actors to inject arbitrary SQL commands into the database query execution process. The flaw demonstrates a classic lack of input validation and proper parameterization in database interactions, creating an avenue for unauthorized data access and potential system compromise.
The technical implementation of this vulnerability stems from the application's failure to sanitize user input before incorporating it into SQL queries. When the f parameter is passed to the buscacep.php script, the application directly concatenates this input into database commands without proper escaping or parameter binding mechanisms. This primitive approach to database interaction aligns with CWE-89, which categorizes SQL injection vulnerabilities as a result of inadequate input validation and improper query construction. The vulnerability operates at the application layer and can be exploited through HTTP requests containing malicious SQL payloads in the f parameter, making it particularly dangerous as it requires minimal reconnaissance and can be automated using standard exploitation frameworks.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with potential access to sensitive information stored within the E-Sic 1.0 database. Depending on the database configuration and the privileges of the application user, attackers could extract confidential records, modify database contents, or even escalate privileges to gain administrative control over the database system. The vulnerability affects the integrity and confidentiality of the application's data repository, potentially exposing personal information of users who have submitted zip code searches. This risk is exacerbated by the fact that the vulnerability exists in a search functionality that is likely frequently accessed, increasing the attack surface and potential exposure window.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security architecture improvements. The primary solution involves implementing proper parameterized queries or prepared statements in the buscacep.php script, ensuring that user input is treated as data rather than executable code. Additionally, input validation should be strengthened to filter or reject potentially malicious characters and patterns before database processing occurs. Organizations should also implement proper access controls and database privilege management to limit the damage that could result from successful exploitation. The remediation process should follow established security frameworks such as those recommended by the OWASP Top Ten project, which emphasizes the importance of proper input handling and database security practices. Regular security testing including automated vulnerability scanning and manual penetration testing should be conducted to identify and address similar vulnerabilities in other application components, ensuring comprehensive protection against SQL injection threats.