CVE-2017-11770 Improper Certificate Validation
An unauthenticated attacker can cause a denial of service in .NET Core web applications by sending malformed certificate data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-11770?
CVE-2017-11770 is a high-severity denial of service vulnerability in Microsoft Corporation .NET Core, 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 parsing certificate data. A denial of service vulnerability exists when .NET Core improperly handles parsing certificate data, aka ".NET CORE Denial Of Service Vulnerability".
Weakness: CWE-295
Which versions are affected by CVE-2017-11770?
4 open source packages ship an affected version, including Microsoft.NETCore.App and System.Security.Cryptography.X509Certificates. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.NETCore.App NuGet | From 1.0.0 | 2.0.3 |
Microsoft.NETCore.App NuGet | From 1.0.0 | 2.0.3 |
System.Security.Cryptography.X509Certificates NuGet | From 4.0.0 | 4.1.2 |
System.Security.Cryptography.X509Certificates NuGet | From 4.0.0 | 4.1.2 |
Products include Microsoft Aspnetcore.
How do I fix CVE-2017-11770?
Upgrade Microsoft.NETCore.App to 2.0.3 or later.
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-2017-11770 being exploited?
There is no known exploitation of CVE-2017-11770 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Corporation .NET Core
Sources
Also known as GHSA-7mfr-774f-w5r9.