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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
import os
from lib.core.common import singleTimeWarnMessage
from lib.core.enums import DBMS
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.HIGHEST
def dependencies():
singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
def tamper(payload, **kwargs):
"""
Replaces (MySQL) instances like 'CONCAT(A, B)' with 'CONCAT_WS(MID(CHAR(0), 0, 0), A, B)' counterpart
Requirement:
* MySQL
Tested against:
* MySQL 5.0
Notes:
* Useful to bypass very weak and bespoke web application firewalls
that filter the CONCAT() function
>>> tamper('CONCAT(1,2)')
'CONCAT_WS(MID(CHAR(0),0,0),1,2)'
"""
if payload:
payload = payload.replace("CONCAT(", "CONCAT_WS(MID(CHAR(0),0,0),")
return payload
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