Watcher: Web security testing tool and passive vulnerability scanner

Watcher is a Fiddleraddon which aims to assist penetration testers in passively finding Web-application vulnerabilities. The security field today has several good choices for HTTP proxies which assist auditors and pen-testers. We chose to implement this as a plugin for Fiddler which already provides the proxy framework for HTTP debugging. Some reasons to use Watcher include:

  • Safe for the Cloud and hosting environments. Being passive gives Watcher several advantages – when applications live in the Cloud there’s often a risk that running security testing could damage the shared infrastructure. However, using a passive tool like Watcher ensures that there’s no chance of damaging Cloud-like infrastructure.
  • Safe for production environments. Watcher does not attack web-applications with loads of intrusive requests, it doesn’t modify inputs to your application. Unlike crawlers and web-application scanners, Watcher does not generate dangerous traffic. It quietly analyzes normal user-interaction and makes educated reports on the security of an application.
  • Low overhead, no training. If you’re building web-applications you already have a development and test staff. Fiddler has been valuable to dev and test for years as a general-purpose HTTP debugging proxy. Watcher fits seamlessly into the picture, providing valuable security insight with no special training requirements, dedicated machines, or other resources.

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