CVE-2023-4776 in School Management System Plugin
Summary
by MITRE • 10/25/2023
The School Management System WordPress plugin before 2.2.5 uses the WordPress esc_sql() function on a field not delimited by quotes and did not first prepare the query, leading to a SQL injection exploitable by relatively low-privilege users like Teachers.
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Analysis
by VulDB Data Team • 11/03/2023
The School Management System WordPress plugin vulnerability represents a critical security flaw that undermines the integrity of educational institution data management systems. This vulnerability exists within a widely used plugin that facilitates school administrative operations including student records, attendance tracking, and academic performance management. The issue affects versions prior to 2.2.5 and demonstrates how seemingly minor coding oversights can create significant security risks in educational technology environments where sensitive personal and academic data resides.
The technical flaw manifests through improper handling of SQL query construction within the plugin's database interactions. Specifically, the developers employed WordPress's esc_sql() function on a field that was not properly quoted within the SQL statement structure. This function serves as a security measure to escape special characters in SQL queries, but it requires proper context to be effective. When applied to unquoted fields without prior query preparation, esc_sql() fails to provide adequate protection against malicious input injection. The vulnerability operates under CWE-89 which classifies SQL injection flaws as weaknesses in software that allows attackers to manipulate database queries through unescaped input parameters, making it particularly dangerous in web applications where user input directly influences database operations.
The operational impact of this vulnerability extends beyond typical web application security concerns, as it specifically targets low-privilege user accounts such as teachers who possess limited administrative rights. This characteristic aligns with ATT&CK technique T1078.004 which describes valid accounts as a method for gaining access to systems where adversaries leverage legitimate user credentials to perform unauthorized actions. Attackers with teacher-level access can exploit this vulnerability to execute arbitrary SQL commands, potentially gaining access to student personal information, academic records, attendance data, and other sensitive educational content. The attack vector demonstrates how privilege escalation can occur through indirect methods where legitimate user roles are leveraged to bypass traditional security controls, creating a significant risk for educational institutions managing thousands of student records.
The implications for educational institutions are particularly severe given the sensitive nature of student data and the regulatory compliance requirements governing such information. Schools must consider the potential exposure of personally identifiable information, academic records, and behavioral data that could be accessed through this vulnerability. The low privilege requirement for exploitation means that even minor security lapses in user account management could result in substantial data breaches. Organizations should implement comprehensive security monitoring to detect unusual database access patterns and ensure prompt patch deployment. The vulnerability also highlights the importance of proper input validation and query preparation practices within WordPress plugin development, emphasizing that even well-intentioned security functions like esc_sql() require proper contextual application to provide meaningful protection against sophisticated attack vectors.