Microsoft Windows 10 1809/10 1903/Server 1903/Server 2019 Update Client privileges management

Summaryinfo

A vulnerability has been found in Microsoft Windows 10 1809/10 1903/Server 1903/Server 2019 and classified as critical. This impacts an unknown function of the component Update Client. Performing a manipulation results in privileges management. This vulnerability is reported as CVE-2019-1336. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows 10 1809/10 1903/Server 1903/Server 2019 (Operating System). It has been classified as critical. This affects an unknown part of the component Update Client. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An elevation of privilege vulnerability exists in the Microsoft Windows Update Client when it does not properly handle privileges, aka 'Microsoft Windows Update Client Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1323.

The weakness was disclosed 10/08/2019 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with Microsoft. This vulnerability is uniquely identified as CVE-2019-1336 since 11/26/2018. It is possible to initiate the attack remotely. A authentication is necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/26/2020). MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

An elevation of privilege vulnerability exists in the Microsoft Windows Update Client when it does not properly handle privileges. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data.

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

The entries VDB-143101, VDB-143100, VDB-143099 and VDB-143098 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10 1809
• 10 1903
• Server 1903
• Server 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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