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SQL queries, where we can add comments in the form of SELECT or SELECT. Inline Comments Adding inline comments can help the string to bypass the WAFs filters and reach its target. This works by using the hex equivalent for certain characters, such as 27 for or 3c for 3d 25 20 Space 0a New line 00 Null byte Lets see an SQL example from module 1: union select password from er limit 1 This SQL query string, URL encoded, will be like this: er20limit201202F We can easily encode and decode with this method with the following website: Null Bytes Another rather simple way of encoding is using a null byte (00) prior to any characters that the WAF filter is blocking.įor example, the SQL Query we used earlier will be: 00 union select password from er limit 1 WAFs will commonly ignore everything after the null but pass the entire string to the web server where it is processed. Bypass Filter Keyword Union Sql Injection Password From MySQL URL Encoding (Hex Encoding) URI standards permit URLs to contain only the printable characters in the US-ASCII charset. Bypass Filter Keyword Union Sql Injection Password From MySQL.
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