Executive Summary

This vulnerability is an authenticated time-based SQL injection in TimeClock Software 1.01. An attacker who has valid credentials can inject SQL code into the 'notes' parameter of the add_entry.php endpoint. By using conditional SQL statements that cause the database to delay its response (e.g., using SLEEP commands), the attacker can measure response times to determine if specific usernames exist in the database. This allows the attacker to enumerate valid usernames by observing time delays in the application's responses. [1]

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Impact Analysis

This vulnerability can allow an authenticated attacker to enumerate valid usernames in the system by exploiting time delays caused by injected SQL commands. Knowing valid usernames can facilitate further attacks such as password guessing or social engineering. Although the vulnerability does not directly allow data modification or extraction, it leaks sensitive information about user existence, which can compromise the security of the system. [1]

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Detection Guidance

This vulnerability can be detected by performing an authenticated time-based SQL injection test against the add_entry.php endpoint, specifically by injecting payloads into the 'notes' parameter. After logging in with valid credentials via a POST request to login_action.php, send crafted requests that include a conditional SQL payload checking for specific usernames in the user_info table. Measure the response time for each request; a delay greater than 5 seconds indicates the presence of the tested username. This method enumerates valid usernames by observing response delays. An example approach is to use a script (e.g., in Python with the requests library) to automate sending these requests and timing responses. [1]

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Mitigation Strategies

To mitigate this vulnerability immediately, ensure that only trusted and authenticated users have access to the TimeClock Software. Limit user privileges to the minimum necessary to reduce the risk of exploitation. Monitor and analyze response times for suspicious activity that may indicate exploitation attempts. Additionally, consider applying any available patches or updates from the software vendor, or implement input validation and parameterized queries to prevent SQL injection. If no patch is available, consider disabling or restricting access to the vulnerable add_entry.php endpoint until a fix is applied. [1]

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