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hunt-aspnet

Hunt ASP.NET-specific surface — ViewState deserialization (signed-only vs encrypted), machineKey recovery, dual-parser MAC-bypass anti-pattern, request-validator bypass, trace.axd/elmah.axd disclosure, load-balanced ViewState cross-node failures, SafeControl enumeration via reflection, customErrors mode=Off stack-trace leaks, classic Webforms .aspx/.asmx/.svc surface. Built for ASP.NET Webforms + WCF + SharePoint farms.

skills/hunt-aspnet/SKILL.md

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Apache-2.0

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## Crown Jewel Targets

ASP.NET deserialization bugs pay among the highest amounts in bug bounty when they reach RCE. Even when patched, the disclosure-tier findings (signed-only ViewState, dual-parser differential, request-validator quirks) reliably pay Low-Medium.

**Highest-value targets:**

- **SharePoint farms** (any version — 2013/2016/2019/SE) — sign-only ViewState + permissive ToolPane.aspx + anonymous FormDigest creates the CVE-2025-53770 ToolShell precondition chain
- **Telerik UI for ASP.NET AJAX** — `Telerik.Web.UI.WebResource.axd` is a documented RCE sink when keys leak (CVE-2017-11317, CVE-2017-11357, CVE-2019-18935)
- **Classic ASP.NET Webforms enterprise apps** — banking portals, dealer portals, HR systems left on .NET Framework 4.x
- **WCF services** (`*.svc?WSDL`) — often forgotten admin endpoints with looser auth than the main app
- **Sitecore CMS** — ViewState + Sitecore-specific deserialization chains (CVE-2021-42237)
- **DotNetNuke (DNN)** — historic ViewState RCE chains
- **Umbraco CMS** — ViewState + custom deserialization sinks