Microsoft Windows up to Server 2019 SSH Command privileges management

Summaryinfo

A vulnerability was found in Microsoft Windows up to Server 2019 and classified as critical. Affected is an unknown function of the component SSH Handler. Executing a manipulation as part of Command can lead to privileges management. This vulnerability appears as CVE-2020-0757. The attack requires local access. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows up to Server 2019 (Operating System). It has been declared as critical. This vulnerability affects an unknown code of the component SSH Handler. The manipulation as part of a Command leads to a privileges management vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An elevation of privilege vulnerability exists when Windows improperly handles Secure Socket Shell remote commands, aka 'Windows SSH Elevation of Privilege Vulnerability'.

The weakness was presented 02/11/2020 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release was coordinated in cooperation with the vendor. This vulnerability was named CVE-2020-0757 since 11/04/2019. The attack needs to be approached locally. A single authentication is needed for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/12/2020). The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

An elevation of privilege vulnerability exists when Windows improperly handles Secure Socket Shell remote commands. An attacker who successfully exploited the vulnerability could run arbitrary code with elevated privileges.

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

See VDB-150029 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10 1809
• 10 1903
• 10 1909
• Server 1903
• Server 1909
• Server 2019

License

• commercial

Website

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

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Once again VulDB remains the best source for vulnerability data.

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