aspnet-viewstate-exploit

name

aspnet-viewstate-exploit

description

How to exploit ASP.NET ViewState deserialization attacks when the secret key is known. Use this skill whenever you need to test ASP.NET applications for ViewState vulnerabilities, analyze ViewState tokens, perform deserialization attacks on .NET applications, or work with __VIEWSTATE parameters. Make sure to use this skill for any ASP.NET security testing involving ViewState, even if the user doesn't explicitly mention 'ViewState' or 'deserialization'.

ASP.NET ViewState Deserialization Exploitation

This skill guides you through exploiting ASP.NET ViewState deserialization vulnerabilities when the validation secret key is known or can be obtained.

Background

ASP.NET ViewState is a mechanism for preserving page and control values between postbacks. When ViewStateMac is enabled but the validation key is compromised, attackers can forge ViewState data to execute arbitrary code.

When to Use This Skill

• You have access to an ASP.NET application's ViewState token
• You know or can obtain the ViewState validation secret key
• You need to test for deserialization vulnerabilities in .NET applications
• You're analyzing __VIEWSTATE parameters in web requests
• You need to generate malicious ViewState payloads

Prerequisites

1. ViewState Token: Extract from the target page's HTML or HTTP requests
2. Validation Secret Key: Must be known or obtained through other means
3. Target Information: ASP.NET version, application configuration

Tools Required

ViewStateExploiter

A Python tool for ViewState manipulation:

pip install viewstate-exploiter

Alternative: Custom Scripts

See scripts/ directory for helper scripts.