Microsoft WCF/WIF SAML Token CVE-2019-1006 Authentication Bypass Vulnerability

Description

An authentication bypass vulnerability exists in Windows Communication Foundation (WCF) and Windows Identity Foundation (WIF), allowing signing of SAML tokens with arbitrary symmetric keys. This vulnerability allows an attacker to impersonate another user, which can lead to elevation of privileges. The vulnerability exists in WCF, WIF 3.5 and above in .NET Framework, WIF 1.0 component in Windows, WIF Nuget package, and WIF implementation in SharePoint. An unauthenticated attacker can exploit this by signing a SAML token with any arbitrary symmetric key. This security update addresses the issue by ensuring all versions of WCF and WIF validate the key used to sign SAML tokens correctly.

Affected Applications

Microsoft .NET Framework 4.5.2 on Windows RT 8.1
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server version 1903 (Server Core installation)
Windows Server version 1903 (Server Core installation)
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft .NET Framework 4.8 on Windows RT 8.1
Windows Server 2016
Windows Server 2012
Windows 10
Windows Server 2019
Microsoft SharePoint Foundation 2010 Service Pack 2
Microsoft .NET Framework 4.8 on Windows Server version 1803 (Server Core Installation)
Windows 8
Windows 7
Microsoft .NET Framework 3.5 on Windows Server version 1803 (Server Core Installation)
Windows RT 8.1
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1
Microsoft.IdentityModel 7.0.0
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
Windows Server version 1803 (Server Core Installation)
Windows Server 2008
Microsoft SharePoint Foundation 2013 Service Pack 1

CVE References

Other References