Microsoft Windows up to Server 2019 Winsock ws2ifsl.sys privileges management

Summaryinfo

A vulnerability labeled as critical has been found in Microsoft Windows. This affects an unknown function in the library ws2ifsl.sys of the component Winsock. Such manipulation leads to privileges management. This vulnerability is listed as CVE-2019-1215. The attack must be carried out locally. In addition, an exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows (Operating System). It has been rated as critical. Affected by this issue is an unknown part in the library ws2ifsl.sys of the component Winsock. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An elevation of privilege vulnerability exists in the way that ws2ifsl.sys (Winsock) handles objects in memory, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1253, CVE-2019-1278, CVE-2019-1303.

The weakness was presented 09/10/2019 as confirmed security update guide (Website). The advisory is available at portal.msrc.microsoft.com. The public release was coordinated in cooperation with the vendor. This vulnerability is handled as CVE-2019-1215. Local access is required to approach this attack. A simple authentication is necessary for exploitation. Technical details as well as a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. The advisory points out:

An elevation of privilege vulnerability exists in the way that ws2ifsl.sys (Winsock) handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated privileges.

A public exploit has been developed by Andreas Fobian in C++ and been published 5 months after the advisory. The exploit is available at github.com. It is declared as attacked. As 0-day the estimated underground price was around $25k-$100k. This issue was added on 11/03/2021 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 05/03/2022:

Apply updates per vendor instructions.

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

The vulnerability is also documented in the databases at Exploit-DB (47935), Zero-Day.cz (550) and EUVD (EUVD-2019-9783). See VDB-141581, VDB-141580, VDB-141579 and VDB-141577 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 7 SP1
• 8.1
• 10
• 10 1607
• 10 1703
• 10 1709
• 10 1803
• 10 1809
• 10 1903
• RT 8.1
• Server 1803
• Server 1903
• Server 2008 R2 SP1
• Server 2008 SP2
• Server 2012
• Server 2012 R2
• Server 2016
• Server 2019

License

• commercial

Website

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

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

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