If unsanitized user input is written to a log entry, a malicious user… #4
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… may be able to forge new log entries.
| @@ -40,7 +40,8 @@ | |||
| """Create an item with a username and users favourite colour and return it.""" | |||
| user_colour.append(item) | |||
| print(user_colour) | |||
| logger.info(item) | |||
| # Sanitize log message to prevent log injection | |||
| logger.info("New user-color entry added: username=%s, color=%s", item.username, item.color) | |||
Check failure
Code scanning / CodeQL
Log Injection High
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AI 2 months ago
To fix the log injection issue, we need to sanitize the user input before logging it. Specifically, we should remove any newline characters from the item.username and item.color fields to prevent log injection attacks. This can be done using the replace method to replace \r\n and \n with empty strings.
| @@ -43,3 +43,5 @@ | ||
| # Sanitize log message to prevent log injection | ||
| logger.info("New user-color entry added: username=%s, color=%s", item.username, item.color) | ||
| sanitized_username = item.username.replace('\r\n', '').replace('\n', '') | ||
| sanitized_color = item.color.replace('\r\n', '').replace('\n', '') | ||
| logger.info("New user-color entry added: username=%s, color=%s", sanitized_username, sanitized_color) | ||
| return item |
| @@ -40,7 +40,8 @@ | |||
| """Create an item with a username and users favourite colour and return it.""" | |||
| user_colour.append(item) | |||
| print(user_colour) | |||
| logger.info(item) | |||
| # Sanitize log message to prevent log injection | |||
| logger.info("New user-color entry added: username=%s, color=%s", item.username, item.color) | |||
Check failure
Code scanning / CodeQL
Log Injection High
Show autofix suggestion
Hide autofix suggestion
Copilot Autofix
AI 2 months ago
To fix the log injection issue, we need to sanitize the user-provided values before logging them. Specifically, we should remove any newline characters from the item.color and item.username values to prevent log injection. This can be achieved using the replace method to replace newline characters with empty strings.
| @@ -43,3 +43,5 @@ | ||
| # Sanitize log message to prevent log injection | ||
| logger.info("New user-color entry added: username=%s, color=%s", item.username, item.color) | ||
| sanitized_username = item.username.replace('\r\n', '').replace('\n', '') | ||
| sanitized_color = item.color.replace('\r\n', '').replace('\n', '') | ||
| logger.info("New user-color entry added: username=%s, color=%s", sanitized_username, sanitized_color) | ||
| return item |
… may be able to forge new log entries.
Issue #1
To fix the log injection issue, we need to sanitize the user input before logging it. Specifically, we should remove any newline characters from the user input to prevent log forgery. This can be done by replacing \r\n and \n with empty strings.
We will modify the code to sanitize the item before logging it. This involves converting the item to a string and then replacing any newline characters.