Function tamper

tamper/randomcase.py:20–66

Replaces each keyword character with random case value (e.g. SELECT -> SEleCt) Tested against: * Microsoft SQL Server 2005 * MySQL 4, 5.0 and 5.5 * Oracle 10g * PostgreSQL 8.3, 8.4, 9.0 * SQLite 3 Notes: * Useful to bypass very weak and

(payload, **kwargs)

    pass

def tamper(payload, **kwargs):
    """
    Replaces each keyword character with random case value (e.g. SELECT -> SEleCt)

    Tested against:
        * Microsoft SQL Server 2005
        * MySQL 4, 5.0 and 5.5
        * Oracle 10g
        * PostgreSQL 8.3, 8.4, 9.0
        * SQLite 3

    Notes:
        * Useful to bypass very weak and bespoke web application firewalls
          that has poorly written permissive regular expressions
        * This tamper script should work against all (?) databases

    >>> import random
    >>> random.seed(0)
    >>> tamper('INSERT')
    'InSeRt'
    >>> tamper('f()')
    'f()'
    >>> tamper('function()')
    'FuNcTiOn()'
    >>> tamper('SELECT id FROM `user`')
    'SeLeCt id FrOm `user`'
    """

    retVal = payload

    if payload:
        for match in re.finditer(r"\b[A-Za-z_]{2,}\b", retVal):
            word = match.group()

            if (word.upper() in kb.keywords and re.search(r"(?i)[`\"'\[]%s[`\"'\]]" % word, retVal) is None) or ("%s(" % word) in payload:
                while True:
                    _ = ""

                    for i in xrange(len(word)):
                        _ += word[i].upper() if randomRange(0, 1) else word[i].lower()

                    if len(_) > 1 and _ not in (_.lower(), _.upper()):
                        break

                retVal = retVal.replace(word, _)

    return retVal