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Minor update of #3527

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This commit is contained in:
Miroslav Stampar
2019-03-11 11:38:16 +01:00
parent a3fe4be6c5
commit f4338952ac
3 changed files with 10 additions and 9 deletions
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14
tamper/substring2leftright.py
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@@ -24,23 +24,23 @@ def tamper(payload, **kwargs):
Note:
* Useful to bypass weak web application firewalls that filter SUBSTRING (but not LEFT and RIGHT)
>>> tamper('SUBSTRING((X FROM 1 FOR 1))')
'LEFT(X,1)'
>>> tamper('SUBSTRING((X FROM 5 FOR 1))')
'LEFT(RIGHT(X,-4),1)'
>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 1 FOR 1)')
'LEFT((SELECT usename FROM pg_user)::text,1)'
>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 3 FOR 1)')
'LEFT(RIGHT((SELECT usename FROM pg_user)::text,-2),1)'
"""
retVal = payload
if payload:
match = re.search(r"SUBSTRING\(\((.*)\sFROM\s(\d+)\sFOR\s1\)\)", payload)
match = re.search(r"SUBSTRING\((.+?)\s+FROM[^)]+(\d+)[^)]+FOR[^)]+1\)", payload)
if match:
pos = int(match.group(2))
if pos == 1:
_ = "LEFT((%s,1))" % (match.group(1))
_ = "LEFT(%s,1)" % (match.group(1))
else:
_ = "LEFT(RIGHT((%s,%d),1))" % (match.group(1), 1-pos)
_ = "LEFT(RIGHT(%s,%d),1)" % (match.group(1), 1 - pos)
retVal = retVal.replace(match.group(0), _)