A new update to the Watcher passive vulnerability detection and security testing tool has been released. Watcher is an open source addon to the Fiddler Web proxy that aids developers, auditors, and penetration testers in finding Web-application security issues as well as hot-spots for deeper review. Among other things, we’ve added new checks to identify the insecure ViewState issues as recently reported by Trustwave’s SpiderLabs .
Download Watcher from CodePlex. A short list of new features and improvements includes:
- A separate, optional component to export results to Team Foundation Server.
- New check to identify insecure ASP.NET VIEWSTATE configurations subject to tampering and pervasive XSS attacks.
- New check to identify insecure JavaServer MyFaces ViewState subject to tampering and XSS attacks.
- New check for Silverlight EnableHtmlAccess.
- Export results to HTML report.
- Compliance mappings to Microsoft SDL.
- If no origin domain is specified, each response domain will be treated as the origin, enabling better cross-domain analysis.
- Assorted bug fixes and improvements.
Bryan Sullivan and Patrick Toomey’s ViewStateViewer plugin  provided inspiration for detecting ASP.NET VIEWSTATE MAC protection. When testing .NET 4.0 we discovered a change in the MAC implementation which has also been accounted for in this check. David Byrne from Trustwave  provided most of the methodology ideas for detecting insecure JavaServer MyFaces ViewState.
In addition to the main developers (Robert Mooney and Samuel Bucholtz), we wanted to thank everyone who helped or provided suggestions for this release:
Jason D. Montgomery
 Trustwave advisory https://www.trustwave.com/spiderlabs/advisories/TWSL2010-001.txt
 ViewStateViewer plugin for Fiddler http://labs.neohapsis.com/2009/08/03/viewstateviewer-a-gui-tool-for-deserializingreserializing-viewstate/