This string is a classic example of a payload, specifically designed to test for vulnerabilities in a database—in this case, IBM DB2 . Anatomy of the Payload
CHR(100)||CHR(85)||CHR(102)||CHR(83) translates to the string "dUfS" .The code asks the database: "Does dUfS equal dUfS?" Since this is always true, the database will process the request without an error. This string is a classic example of a
The 'KEYWORD' starts by closing a legitimate search or input field with a single quote. This allows the attacker to append their own logic. This allows the attacker to append their own logic
If the page loads, the answer is "Yes." If it fails, the answer is "No." By repeating this, they can extract entire databases character by character. How to Prevent This The attacker is attempting to "trick" the database
If the website loads normally, the attacker knows the database processed the "True" statement ( dUfS = dUfS ) successfully.
The attacker is attempting to "trick" the database into running a command that was never intended by the website's developers.
This is a final "always true" statement used to ensure the rest of the original, legitimate SQL query doesn't break the injection. What is the Goal?
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118 U.S.C. § 2257 Record-Keeping Requirements Compliance Statement