Log File Null Byte Injection
Log files are used by applications and systems to record events and actions that happen during their operation. These log files can be used to troubleshoot problems, monitor the system or to gather information about user activity.
A Null Byte Injection attack occurs when an attacker appends a null (0x00) byte to the end of a web request URL or a file name which is then added to a log file. This can cause the log file to truncate the data after the null byte, which can then be replaced with malicious code, allowing the attacker to execute arbitrary code or modify the log file content to hide their tracks.
For example, if an attacker adds a null byte to the end of a URL that includes a malicious script, the web server may log only part of the URL, and the malicious script would then be executed.
To prevent Null Byte Injection, developers need to sanitize user input to ensure that it does not contain any null characters, and applications should also validate the data before it is written to log files.
In summary, Null Byte Injection is a security vulnerability that allows attackers to execute malicious code or modify log files by exploiting null bytes in web requests or file names.