A vulnerability classified as critical has been found in Microsoft ASP.NET Core MVC 1.0.0. Affected is an unknown functionality of the component View. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 09/13/2016 as 3181759 as confirmed security advisory (Technet). The advisory is available at technet.microsoft.com. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/05/2017). This vulnerability is assigned to T1068 by the MITRE ATT&CK project. The advisory points out:

Microsoft is aware of a security vulnerability in the public version of ASP.NET Core MVC 1.0.0 where View Components could receive incorrect information, including details of the current authenticated user. If a View Component depends on the vulnerable code and makes decisions based on the current user, then the View Component could make incorrect decisions that result in elevation of privilege.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com. The best possible mitigation is suggested to be upgrading to the latest version. The security advisory contains the following remark:

A View Component must use the User property that is exposed by the ViewComponent class to make decisions or change output based on the contents of the User property. Third-party code may also include View Components that act in such a way. Microsoft encourages all developers to update their packages, regardless of whether they use either View Components or the User property within them, to protect against future use of the components by either themselves or third-party software.

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• Microsoft

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• ASP.NET Core MVC

Version

• 1.0.0

License

• commercial

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CPE 2.2info

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