CVE-2019-0545: Infoleak
An information disclosure vulnerability exists in .NET Framework and .NET Core which allows bypassing Cross-origin Resource Sharing (CORS) configurations, aka ".NET Framework Information Disclosure Vulnerability." This affects Microsoft .NET Framework 2.0, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.7/4.7.1/4.7.2, .NET Core 2.1, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, .NET Core 2.2, Microsoft .NET Framework 4.7.2.
Other sources
On .NET Core, we mishandle 1xx (includes 100-Continue) response as a final response on SocketsHttpHandler, which will constitute a cross-origin information disclosure vulnerability in case the client multiplexes requests to different origins onto a single persistent connection: the real final response to the first request will be used as a response for a different request on the same connection. (a well behaved server can cause information disclosure as well).
— Red Hat
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2019-0545?
CVE-2019-0545 is an information disclosure vulnerability in .NET Framework and .NET Core.
How severe is CVE-2019-0545?
CVE-2019-0545 has a severity rating of 7.5 (high).
Which software versions are affected by CVE-2019-0545?
CVE-2019-0545 affects Microsoft .NET Framework 2.0, Microsoft .NET Framework 3.0, and Microsoft .NET Core 2.1 and 2.2.
How can I fix CVE-2019-0545?
To fix CVE-2019-0545, update your Microsoft .NET Framework or .NET Core installation to version 2.1.7, 2.2.1, or newer.
Where can I find more information about CVE-2019-0545?
You can find more information about CVE-2019-0545 at the following references: - [http://www.securityfocus.com/bid/106405](http://www.securityfocus.com/bid/106405) - [https://access.redhat.com/errata/RHSA-2019:0040](https://access.redhat.com/errata/RHSA-2019:0040) - [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0545](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0545)