Denial of Service (DoS) Affecting microsoft.aspnetcore Open this link in a new tab package, versions [2.0.0-preview1-final, 2.0.1)
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14 Apr 2019
9 Apr 2019
Giorgi Dalakishvili of the Bank of Georgia
How to fix?
Microsoft.AspNetCore to version 2.0.1 or higher.
Microsoft.AspNetCore is an open-source and cross-platform framework for building modern cloud based internet connected applications, such as web apps, IoT apps and mobile backends.
Affected versions of this package are vulnerable to Denial of Service (DoS). when ASP.NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability remotely, without authentication and may cause denial of service against an ASP.NET Core web application.
** NOTE: The vulnerability affects any Microsoft ASP.NET Core 2.2 applications if it is hosted on an IIS server running AspNetCoreModuleV2 (ANCM) prior to and including version 12.2.19024.2.
The vulnerability affects any Microsoft ASP.NET Core 1.0/1.1/2.1 application if they have explicitly opted into using the newer AspNetCoreModuleV2 (ANCM) prior to and including version 12.2.19024.2. **
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm