Microsoft .NET Framework up to 4.8 WCF/WIF SAML Token Impersonation improper authentication

Summaryinfo

A vulnerability classified as critical was found in Microsoft .NET Framework up to 4.8. Affected by this vulnerability is an unknown functionality of the component WCF/WIF SAML Token Handler. Such manipulation leads to improper authentication (Impersonation). This vulnerability is uniquely identified as CVE-2019-1006. The attack can be launched remotely. No exploit exists. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Microsoft .NET Framework up to 4.8 (Programming Language Software). Affected by this issue is an unknown function of the component WCF/WIF SAML Token Handler. The manipulation with an unknown input leads to a improper authentication vulnerability (Impersonation). Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An authentication bypass vulnerability exists in Windows Communication Foundation (WCF) and Windows Identity Foundation (WIF), allowing signing of SAML tokens with arbitrary symmetric keys, aka 'WCF/WIF SAML Token Authentication Bypass Vulnerability'.

The weakness was disclosed 07/09/2019 as confirmed security update guide (Website). The advisory is available at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with the vendor. This vulnerability is handled as CVE-2019-1006 since 11/26/2018. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The advisory points out:

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.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The entry VDB-137521 is pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Programming Language Software

Vendor

• Microsoft

Name

• .NET Framework

Version

• 2.0 SP2
• 3.0 SP2
• 3.5
• 3.5.1
• 4.5.2
• 4.6
• 4.6.1
• 4.6.2
• 4.7
• 4.7.1
• 4.7.2
• 4.8

License

• free

Website

• Vendor: https://www.microsoft.com/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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