CVE-2017-11883 Denial of service in ASP.NET Core
An unauthenticated attacker can cause a denial of service against ASP.NET Core web applications by sending improperly handled web requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-11883?
CVE-2017-11883 is a high-severity denial of service vulnerability in Microsoft Corporation ASP.NET, published on 15 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
.NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial of service attack against a .NET Core web application by improperly handling web requests, aka ".NET CORE Denial Of Service Vulnerability".
Which versions are affected by CVE-2017-11883?
10 open source packages ship an affected version, including Microsoft.AspNetCore.Server.WebListener, Microsoft.AspNetCore.Server.HttpSys and Microsoft.Net.Http.Server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.Server.WebListener NuGet | From 1.0.0 | 1.0.6 |
Microsoft.AspNetCore.Server.WebListener NuGet | From 1.0.0 | 1.0.6 |
Microsoft.AspNetCore.Server.WebListener NuGet | From 1.1.0 | 1.1.4 |
Microsoft.AspNetCore.Server.WebListener NuGet | From 1.1.0 | 1.1.4 |
Microsoft.AspNetCore.Server.HttpSys NuGet | From 2.0.0 | 2.0.2 |
Microsoft.AspNetCore.Server.HttpSys NuGet | From 2.0.0 | 2.0.2 |
4 more packages
Microsoft.Net.Http.Server NuGet | From 1.0.0 | 1.0.6 |
Microsoft.Net.Http.Server NuGet | From 1.0.0 | 1.0.6 |
Microsoft.Net.Http.Server NuGet | From 1.1.0 | 1.1.4 |
Microsoft.Net.Http.Server NuGet | From 1.1.0 | 1.1.4 |
Products include Microsoft Aspnetcore.
How do I fix CVE-2017-11883?
Upgrade Microsoft.AspNetCore.Server.WebListener to a fixed version for your release line: 1.0.6 or 1.1.4.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-11883 being exploited?
There is no known exploitation of CVE-2017-11883 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Corporation ASP.NET
Sources
Also known as GHSA-f9jc-rrm2-pmfg.