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46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2020 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 re
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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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pass
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def tamper(payload, **kwargs):
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"""
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Replaces greater than operator ('>') with 'GREATEST' counterpart
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Tested against:
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* MySQL 4, 5.0 and 5.5
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* Oracle 10g
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* PostgreSQL 8.3, 8.4, 9.0
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Notes:
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* Useful to bypass weak and bespoke web application firewalls that
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filter the greater than character
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* The GREATEST clause is a widespread SQL command. Hence, this
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tamper script should work against majority of databases
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>>> tamper('1 AND A > B')
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'1 AND GREATEST(A,B+1)=A'
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"""
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retVal = payload
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if payload:
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match = re.search(r"(?i)(\b(AND|OR)\b\s+)([^>]+?)\s*>\s*(\w+|'[^']+')", payload)
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if match:
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_ = "%sGREATEST(%s,%s+1)=%s" % (match.group(1), match.group(3), match.group(4), match.group(3))
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retVal = retVal.replace(match.group(0), _)
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return retVal
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