Microsoft ASP.NET Core Cross-Site Request Forgery Vulnerability [CVE-2018-0785]

A vulnerability in ASP.NET Core could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack on a targeted system – CVE-2018-0785

The vulnerability is due to the use of vulnerable project templates when a web application is created with the affected software. An attacker could exploit this vulnerability by persuading a user to access a link that submits malicious input to the affected software. A successful exploit could allow the attacker to modify the user’s two-factor authentication (2FA) device’s recovery codes without the user’s knowledge. This could lead to a denial of service (DoS) condition if the user loses access to the 2FA device and requires a recovery code.

Microsoft confirmed the vulnerability and released software updates.

Analysis

To exploit this vulnerability, the attacker may use misleading language or instructions to persuade a user to access a link that submits malicious input to the affected software.

Microsoft addressed this vulnerability by correcting the ASP.NET Core project templates.

Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.

Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

Administrators are advised to use an unprivileged account when browsing the Internet.

Administrators are advised to monitor critical systems.

Vendor Announcement
Microsoft has released detailed information at the following link: Security Update Guide
Fixed Software
Microsoft customers can obtain updates directly by using the links in the Microsoft Security Update Guide. These updates are also distributed by Windows automatic update features and are available from the Microsoft Update Catalog. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.




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