Microsoft Windows up to Server 2004 Setup default permission

Summaryinfo

A vulnerability, which was classified as critical, has been found in Microsoft Windows up to Server 2004. This issue affects some unknown processing of the component Setup. This manipulation causes default permission. The identification of this vulnerability is CVE-2020-1571. The attack can only be executed locally. Furthermore, there is an exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows up to Server 2004 (Operating System). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Setup. The manipulation with an unknown input leads to a default permission vulnerability. The CWE definition for the vulnerability is CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An elevation of privilege vulnerability exists in Windows Setup in the way it handles permissions. A locally authenticated attacker could run arbitrary code with elevated system privileges. After successfully exploiting the vulnerability, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The security update addresses the vulnerability by ensuring Windows Setup properly handles permissions.

The weakness was shared 08/11/2020 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The vendor cooperated in the coordination of the public release. This vulnerability is known as CVE-2020-1571. Attacking locally is a requirement. The successful exploitation needs a single authentication. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1222 according to MITRE ATT&CK. The advisory points out:

An elevation of privilege vulnerability exists in Windows Setup in the way it handles permissions.

A public exploit has been developed by Abdelhamid Naceri (klinix5) in C++ and been published 3 days after the advisory. It is possible to download the exploit at github.com. It is declared as functional. We expect the 0-day to have been worth approximately $25k-$100k.

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-159563, VDB-159562, VDB-159561 and VDB-159560 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10 1803
• 10 1809
• 10 1903
• 10 1909
• 10 2004
• Server 2004

License

• commercial

Website

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

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