Denial of Service (DoS) Affecting microsoft.aspnetcore.mvc.apiexplorer package, versions [1,1.0.4)[1.1,1.1.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-MICROSOFTASPNETCOREMVCAPIEXPLORER-60109
- published9 May 2017
- disclosed9 May 2017
- creditDavid Fernandez
Introduced: 9 May 2017
CVE-2017-0247 (opens in a new tab)How to fix?
Upgrade Microsoft.AspNetCore.Mvc.ApiExplorer to version 1.0.4, 1.1.3 or higher.
Overview
Microsoft.AspNetCore.Mvc.ApiExplorer is the explorer functionality for discovering metadata such as the list of controllers and actions, and their URLs and allowed HTTP methods.
Affected versions of this package are vulnerable to Denial of Service (DoS) attacks.
A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests.
NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.
Details
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
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