The core of the payload is SELECT UPPER(XMLType(...)) FROM DUAL .
AND 'pLsa'='pLs is a "dead end" string to balance out the remaining single quote from the original application code, preventing a syntax error that might mask the injection result.
: SQL Injection (Error-Based/Out-of-Band). The core of the payload is SELECT UPPER(XMLType(
The CHR() functions are used to bypass simple text filters. They translate to: CHR(60) = < CHR(58) = :
The payload injects a subquery: (SELECT (CASE WHEN (6957=6957) THEN 1 ELSE 0 END) FROM DUAL) . This is a "Boolean test" to see if the logic holds true. : The CHR() functions are used to bypass simple text filters
When Oracle tries to parse the resulting string (e.g., <:qbqvq1qqbqq> ), it realizes it is not a valid XML format. It then returns an error message like: LPX-00110: XML parsing failed... at '<:qbqvq1qqbqq>' .
To prevent this, you should concatenate user input directly into SQL strings. Instead: : When Oracle tries to parse the resulting string (e
The initial '{KEYWORD}' AND ... attempts to break out of a single-quoted string literal within a vulnerable SQL query. :