From 9925adf7997927c1d21382c5a2169427b6f8efc7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miroslav=20=C5=A0tampar?= <miroslav.stampar@gmail.com>
Date: Tue, 21 Jul 2026 13:33:53 +0200
Subject: [PATCH] Adding tamper script sign

---
 lib/controller/checks.py | 31 ++++++++++++++++----------
 lib/core/settings.py     |  2 +-
 tamper/sign.py           | 47 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 13 deletions(-)
 create mode 100644 tamper/sign.py

diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 473e5719b..533a157c6 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -1061,29 +1061,36 @@ def checkFilteredChars(injection):
     # inference techniques depend on character '>'
     if not any(_ in injection.data for _ in (PAYLOAD.TECHNIQUE.ERROR, PAYLOAD.TECHNIQUE.UNION, PAYLOAD.TECHNIQUE.QUERY)):
         if not checkBooleanExpression("%d>%d" % (randInt + 1, randInt)):
-            # '>' is filtered - blind inference bisection (e.g. ASCII(...)>N) would silently
-            # retrieve nothing. Auto-apply the 'between' tamper (>  ->  NOT BETWEEN 0 AND, SQL
-            # standard, all DBMS) and re-verify, so the run adapts in place instead of forcing a
-            # manual rerun. Skipped when the user chose their own '--tamper' (respect that choice).
-            adapted = False
+            # '>' is filtered - blind inference (bisection and the count/length integer retrievals
+            # all rely on '>') would silently retrieve nothing. Cascade through the '>'-free
+            # comparison rewrites and adopt the first that RE-VERIFIES working, so the run adapts in
+            # place instead of forcing a manual rerun: 'between' (>  ->  NOT BETWEEN 0 AND) first,
+            # then 'greatest' (GREATEST()-based) for when BETWEEN itself is filtered. Skipped when the
+            # user chose their own '--tamper' (respect that choice).
+            adapted = None
 
             if not conf.tamper:
                 from lib.utils.wafbypass import loadTamper
-                function = loadTamper("between")
 
-                if function is not None and function not in (kb.tamperFunctions or []):
+                for name in ("between", "greatest", "sign"):
+                    function = loadTamper(name)
+                    if function is None or function in (kb.tamperFunctions or []):
+                        continue
+
                     kb.tamperFunctions = (kb.tamperFunctions or []) + [function]
                     _ = randomInt()
 
                     if checkBooleanExpression("%d>%d" % (_ + 1, _)):
-                        adapted = True
-                        infoMsg = "the character '>' appears to be filtered by the back-end "
-                        infoMsg += "server; sqlmap automatically applied the 'between' tamper script to adapt"
-                        logger.info(infoMsg)
+                        adapted = name
+                        break
                     else:
                         kb.tamperFunctions.remove(function)
 
-            if not adapted:
+            if adapted:
+                infoMsg = "the character '>' appears to be filtered by the back-end server; "
+                infoMsg += "sqlmap automatically applied the '%s' tamper script to adapt" % adapted
+                logger.info(infoMsg)
+            else:
                 warnMsg = "it appears that the character '>' is "
                 warnMsg += "filtered by the back-end server. You are strongly "
                 warnMsg += "advised to rerun with the '--tamper=between'"
diff --git a/lib/core/settings.py b/lib/core/settings.py
index d042eda90..0601a6164 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from lib.core.enums import OS
 from thirdparty import six
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.10.7.168"
+VERSION = "1.10.7.169"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)
diff --git a/tamper/sign.py b/tamper/sign.py
new file mode 100644
index 000000000..ff15c5c8e
--- /dev/null
+++ b/tamper/sign.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+"""
+Copyright (c) 2006-2026 sqlmap developers (https://sqlmap.org)
+See the file 'LICENSE' 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 'SIGN' counterpart (e.g. SIGN((A)-(B))=1)
+
+    Tested against:
+        * MySQL 5
+        * Oracle 11g
+        * PostgreSQL 9
+        * Microsoft SQL Server 2012
+
+    Notes:
+        * Useful to bypass filtering of comparison operators altogether (>, <,
+          >=, <=), as SIGN() needs none of them - only subtraction and '='.
+          sqlmap's blind inference always compares a numeric ordinal against an
+          integer literal, so SIGN((A)-(B))=1 is an exact equivalent of A>B
+          there (no NULL/decimal/date/collation/overflow concerns in that domain)
+
+    >>> tamper('1 AND A > B')
+    '1 AND SIGN((A)-(B))=1'
+    """
+
+    retVal = payload
+
+    if payload:
+        match = re.search(r"(?i)(\b(AND|OR)\b\s+)([^><]+?)\s*(?<![<>!])>(?!=)\s*(\w+|'[^']+')", payload)
+
+        if match:
+            _ = "%sSIGN((%s)-(%s))=1" % (match.group(1), match.group(3), match.group(4))
+            retVal = retVal.replace(match.group(0), _)
+
+    return retVal