But the injection point is inside the LIKE '%[injection]%' string. You need to .
: The application expects a valid coupon code to set the price to
If the value is too long for a single DNS label (max 63 characters), you must chunk it, e.g., using SUBSTRING in a loop.
Understanding how to exploit the vulnerability is only half the battle. To fix this in a real-world scenario, you must implement proper secure coding practices. 1. Prepared Statements (Parameterized Queries)
Look through the output for a suspicious table name. It is often something obvious like keys , secrets , or challenge5_data . sql+injection+challenge+5+security+shepherd+new
: In SQL, \\ is interpreted as a single literal backslash ( \ ), and the ' that follows is treated as a terminating quote for the SQL string.
By leveraging the escaping loophole, a generic payload structure can be assembled to nullify the query logic:
Here is how the injection works:
Unlike early-stage challenges that rely solely on basic single-quote breaks, Challenge 5 requires recognizing how the container handles characters. Depending on the specific version or deployment fork of Security Shepherd, the input box wraps data using either double quotes or handles characters within a conditional payload structure. Step 1: Mapping the Attack Surface But the injection point is inside the LIKE
→́′4 lines; Line 1:; Line 2: modified right arrow with acute accent above; Line 3:; Line 4: prime end-lines;
\' OR 1=1; --
Filter blocks single quote. But what if you use double quotes? The filter allows double quotes? Let’s test: input " — validation passes. Double quotes are not in the blocked set. Interesting.
Let's trace what happens:
: If you enter a standard payload like ' OR 1=1; -- , it will likely fail because the single quote is neutralized.
: Implement strict whitelisting to ensure input matches expected formats (e.g., alphanumeric only).
You’ve just completed Challenge 4, where you bypassed a login using a basic ' OR '1'='1 attack. Now, Challenge 5 presents a new target: — a minimalist web app that claims to have fixed all SQL injection vulnerabilities.
If single quotes are blocked, we can use hex encoding or simply rely on numerical manipulation if the item_id is not enclosed in quotes within the SQL query (which is rare, but possible) or by using database-specific functions. Understanding how to exploit the vulnerability is only
SELECT coupon_code FROM coupons WHERE coupon_code = 'User_Input'; Use code with caution.