Microsoft ASP.NET Core 2.1/2.2/3.0 Project Template input validation

Summaryinfo

A vulnerability described as critical has been identified in Microsoft ASP.NET Core 2.1/2.2/3.0. Affected by this vulnerability is an unknown functionality of the component Project Template Handler. The manipulation results in input validation. This vulnerability is identified as CVE-2019-1302. The attack can be executed remotely. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft ASP.NET Core 2.1/2.2/3.0. Affected is an unknown code block of the component Project Template Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An elevation of privilege vulnerability exists when a ASP.NET Core web application, created using vulnerable project templates, fails to properly sanitize web requests, aka 'ASP.NET Core Elevation Of Privilege Vulnerability'.

The weakness was released 09/10/2019 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release was coordinated with the vendor. This vulnerability is traded as CVE-2019-1302 since 11/26/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/20/2020). The advisory points out:

An elevation of privilege vulnerability exists when a ASP.NET Core web application, created using vulnerable project templates, fails to properly sanitize web requests. An attacker who successfully exploited this vulnerability could perform content injection attacks and run script in the security context of the logged-on user.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Microsoft

Name

• ASP.NET Core

Version

• 2.1
• 2.2
• 3.0

License

• open-source

Website

• Vendor: https://www.microsoft.com/

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Once again VulDB remains the best source for vulnerability data.

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