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Fix regex for tamper script greatest #2690

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Fix regex for tamper script greatest #2690

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4 changes: 2 additions & 2 deletions tamper/greatest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,10 +36,10 @@ def tamper(payload, **kwargs):
retVal = payload

if payload:
match = re.search(r"(?i)(\b(AND|OR)\b\s+)(?!.*\b(AND|OR)\b)([^>]+?)\s*>\s*([^>#-]+)", payload)
match = re.search(r"(?i)((?:\bAND|OR\b)\s*)((?:(?!\bAND|OR\b).)+?)\s*>\s*((?:(?!\bAND|OR\b).)+?)(\s*(?:\bAND|OR\b))", payload)

if match:
_ = "%sGREATEST(%s,%s+1)=%s" % (match.group(1), match.group(4), match.group(5), match.group(4))
_ = "%sGREATEST(%s,%s+1)=%s%s" % (match.group(1), match.group(2), match.group(3), match.group(2), match.group(4))
retVal = retVal.replace(match.group(0), _)

return retVal
43 changes: 43 additions & 0 deletions tamper/least.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,43 @@
#!/usr/bin/env python

"""
Copyright (c) 2006-2017 sqlmap developers (http://sqlmap.org/)
See the file 'doc/COPYING' for copying permission
"""

import re

from lib.core.enums import PRIORITY

__priority__ = PRIORITY.HIGHEST

def dependencies():
pass

def tamper(payload, **kwargs):
"""
Replaces greater than operator ('>') with 'LEAST' counterpart

Tested against:
* MySQL 5.5

Notes:
* Useful to bypass weak and bespoke web application firewalls that
filter the greater than character
* The LEAST clause is a widespread SQL command. Hence, this
tamper script should work against majority of databases

>>> tamper('1 AND A > B')
'1 AND LEAST(A,B+1)=B+1'
"""

retVal = payload

if payload:
match = re.search(r"(?i)((?:\bAND|OR\b)\s*)((?:(?!\bAND|OR\b).)+?)\s*>\s*((?:(?!\bAND|OR\b).)+?)(\s*(?:\bAND|OR\b))", payload)

if match:
_ = "%sLEAST(%s,%s+1)=%s+1%s" % (match.group(1), match.group(2), match.group(3), match.group(3), match.group(4))
retVal = retVal.replace(match.group(0), _)

return retVal