SQL injection vulnerability in the advCalendar extension 0.3.1 and earlier for TYPO3 allows remote attackers to execute arbitrary SQL commands via unspecified vectors.
Remote attackers can exploit a SQL injection vulnerability in the advCalendar extension for TYPO3, potentially leading to complete system compromise. This vulnerability allows attackers to execute arbitrary SQL commands, enabling them to steal sensitive data, modify content, or gain unauthorized access to the underlying database and server.
Step 1: Payload Delivery: The attacker crafts a malicious HTTP request targeting the advCalendar extension. This request includes specially crafted input parameters designed to exploit the SQL injection vulnerability.
Step 2: Input Processing: The advCalendar extension receives the malicious HTTP request and processes the input parameters. The vulnerable code within the extension fails to properly validate or sanitize the attacker-controlled input.
Step 3: SQL Query Construction: The extension's code constructs an SQL query using the attacker-supplied input. Because the input is not sanitized, the attacker's malicious SQL code is directly incorporated into the query.
Step 4: Query Execution: The vulnerable SQL query, now containing the attacker's injected code, is executed against the database.
Step 5: Database Manipulation: The attacker's injected SQL code is executed by the database, allowing the attacker to perform actions such as retrieving sensitive data (e.g., usernames, passwords), modifying data, or even executing arbitrary commands on the database server, depending on the database user's privileges.
The vulnerability stems from insufficient input validation and sanitization within the advCalendar extension's code. Specifically, the extension fails to properly sanitize user-supplied input before incorporating it into SQL queries. This allows attackers to inject malicious SQL code through crafted requests. The lack of parameterized queries or prepared statements further exacerbates the issue, making it easier for attackers to manipulate the database. The root cause is a missing or inadequate implementation of secure coding practices, leading to a classic SQL injection flaw. The specific function or logic flaw likely involves the construction of SQL queries using unsanitized user input, such as parameters passed through HTTP requests, without proper escaping or filtering.