SB2018031316 - Multiple vulnerabilities in Microsoft ASP.NET Core

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2018-0808)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to an error in ASP.NET Core when handling malicious web requests. A remote attacker can issue specially crafted requests to the .NET Core application and cause a denial of service against an ASP.NET Core web application.

2) Privilege escalation (CVE-ID: CVE-2018-0787)

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The weakness exists due to improper validation of web requests by a Kestrel web application. A remote attacker can send a specially crafted request, containing injected HTML, initiate a "password reset" email to the target user, trigger as soon as the target user opens the "password reset" e-mail and gain system privileges.

3) Improper input validation (CVE-ID: CVE-2018-0875)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the way that .NET Core handles specially crafted requests. A remote attacker can send a small number of specially crafted requests to an .NET Core web application, trigger a hash collision and cause performance to degrade significantly enough to cause service crash.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0808
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0787
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0875