Add new tamper script 'mysqlversioncomment.py'

[pinoyvendetta]

Description

This pull request introduces a new tamper script, mysqlversioncomment.py, designed to obfuscate SQL injection payloads targeting MySQL databases. The script wraps a comprehensive list of common SQL keywords, functions, and information schema objects within MySQL-specific versioned comments (e.g., /*!50000KEYWORD*/).

This obfuscation technique is effective at bypassing basic Web Application Firewalls (WAFs) and Intrusion Detection Systems (IDS) that perform simple keyword filtering without correctly parsing MySQL's versioned comment syntax.

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How it Works

The script iterates through a predefined list of keywords and functions. To ensure correctness, it replaces longer keywords first (e.g., GROUP BY before BY) and uses word boundaries to prevent accidental replacement of substrings within other words.

Example of transformation:

• Before:

  1 UNION SELECT GROUP_CONCAT(table_name) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = database()

• After:

  1 /*!50000UNION*/ /*!50000SELECT*/ /*!50000GROUP_CONCAT*/(/*!50000table_name*/) /*!50000FROM*/ /*!50000INFORMATION_SCHEMA.TABLES*/ /*!50000WHERE*/ /*!50000table_schema*/ = /*!50000database()*/

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This addition provides another valuable tool for penetration testers to use when faced with filtered environments.