Security Bypass Affecting microsoft.owin package, versions [,4.1.1)
Exploit Maturity
Proof of concept
Attack Complexity
Low
Integrity
High
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snyk-id
SNYK-DOTNET-MICROSOFTOWIN-1019387
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published
9 Sep 2020
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disclosed
8 Sep 2020
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credit
Matt Langlois of Github Security Team
Introduced: 8 Sep 2020
CVE-2020-1045 Open this link in a new tabHow to fix?
Upgrade Microsoft.Owin to version 4.1.1 or higher.
Overview
Microsoft.Owin is a Provides a set of helper types and abstractions for simplifying the creation of OWIN components.
Affected versions of this package are vulnerable to Security Bypass. The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded. The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names. This CVE also affects Microsoft.Owin due to it using a similar cookie parsing mechanism.