If you are seeing this in your logs, your system is being scanned for vulnerabilities. You should take the following steps immediately:
: This is used to terminate the original SQL statement and begin a new, unauthorized command [3].
: This is likely a placeholder where a legitimate search term or data value would normally go. If you are seeing this in your logs,
: This is an obfuscated way of writing the string "lbtV." Attackers use CHR() codes to bypass simple security filters that look for specific words [5]. ,5 : This tells the database to wait for 5 seconds [2].
Use "Prepared Statements" so the database treats the input as literal text, not executable code [7]. : This is an obfuscated way of writing the string "lbtV
Ensure your database user account does not have permission to execute sensitive packages like DBMS_PIPE unless absolutely necessary [8].
Use "allow-lists" to ensure only expected characters (like letters and numbers) are accepted [7]. Ensure your database user account does not have
: This is a built-in Oracle function. In this context, it is being used to force the database to pause or "sleep" for a specific amount of time [2, 4].