DotVVM vulnerabilities

DotVVM prior to versions 4.2.11, 4.3.15, and 5.0.0-preview09-final allows unauthenticated users to submit files directly to DotvvmFileUploadMiddleware without an X-DotVVM-UploadToken generated by the FileUpload component. An attacker can repeatedly upload files and fill application storage, causing denial of service. DotvvmConfiguration.Security.AuthorizeFileUpload can additionally restrict which users may upload files.

In DotVVM prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, a route with multiple unconstrained parameters in one path segment can cause excessive regex backtracking in DotvvmRoute.IsMatch when a long near-match path is supplied. The lack of a matching timeout in DotvvmRouteParser.RouteRegex leads to resource exhaustion.

DotVVM is an open source MVVM framework for web applications. Prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, AuthorizeActionFilter performs no authorization because its explicit ICommandActionFilter.OnCommandExecutingAsync, IViewModelActionFilter.OnViewModelCreatedAsync, and IPresenterActionFilter.OnPresenterExecutingAsync implementations return completed tasks instead of invoking the corresponding checks. Applications relying on this filter can therefore expose protected commands, view models, or presenters to unauthorized requests without any special bypass technique.