Added Unicode-escape tamper script

tamper/charunicodeescape.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+"""
+Copyright (c) 2006-2017 sqlmap developers (http://sqlmap.org/)
+See the file 'doc/COPYING' for copying permission
+"""
+
+import os
+import string
+
+from lib.core.enums import PRIORITY
+from lib.core.common import singleTimeWarnMessage
+
+__priority__ = PRIORITY.LOWEST
+
+def tamper(payload, **kwargs):
+    """
+    Unicode-escapes non-encoded characters in a given payload (not
+    processing already encoded)
+
+    Notes:
+        * Useful to bypass weak filtering and/or WAFs in JSON contexes
+
+    >>> tamper('SELECT FIELD%20FROM TABLE')
+    '\u0053\u0045\u004C\u0045\u0043\u0054\u0020\u0046\u0049\u0045\u004C\u0044\u0020\u0046\u0052\u004F\u004D\u0020\u0054\u0041\u0042\u004C\u0045'
+    """
+
+    retVal = payload
+
+    if payload:
+        retVal = ""
+        i = 0
+
+        while i < len(payload):
+            if payload[i] == '%' and (i < len(payload) - 2) and payload[i + 1:i + 2] in string.hexdigits and payload[i + 2:i + 3] in string.hexdigits:
+                retVal += "\\u00%s" % payload[i + 1:i + 3]
+                i += 3
+            else:
+                retVal += '\\u%.4X' % ord(payload[i])
+                i += 1
+
+    return retVal