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Microsoft Security Advisory CVE-2018-8416: .NET Core Tampering Vulnerability #95
Microsoft Security Advisory CVE-2018-8416: .NET Core Tampering Vulnerability
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET Core 2.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
Microsoft is aware of a tampering vulnerability exists when .NET Core improperly handles specially crafted files. An attacker who successfully exploited this vulnerability could write arbitrary files and directories to certain locations on a vulnerable system. However, an attacker would have limited control over the destination of the files and directories.
To exploit the vulnerability, an attacker must send a specially crafted file to a vulnerable system
The update addresses the vulnerability by correcting how .NET Core handles these files.
Discussion for this issue can be found at dotnet/corefx#34427
If your application does not extract ZIP compressed files it is unaffected.
Any .NET Core based application that uses the System.IO.Compression.ZipFile package with a vulnerable version listed below.
If your host version is 2.1.x and the highest
You will not see SDK versions if you have only installed the runtime.
Finally, you must restart your applications once an updated runtime or SDK is installed.
Reporting Security Issues
If you have found a potential security issue in .NET Core, please email details to firstname.lastname@example.org. Reports may qualify for the .NET Core Bug Bounty. Details of the .NET Core Bug Bounty including terms and conditions are at https://aka.ms/corebounty.
You can ask questions about this issue on GitHub in the .NET Core or ASP.NET Core organizations. These are located at https://github.com/dotnet/ and https://github.com/aspnet/. The Announcements repo for each product (https://github.com/dotnet/Announcements and https://github.com/aspnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the discussion issue.
The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
V1.1 (January 9, 2019): Correct affected pacakge table.
Last Updated 2019-01-09