Microsoft Windows up to Server 2019 Remote Desktop Service path traversal

Summaryinfo

A vulnerability classified as critical has been found in Microsoft Windows. This affects an unknown part of the component Remote Desktop Service. Performing a manipulation results in input validation. This vulnerability is known as CVE-2019-0887. Remote exploitation of the attack is possible. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows (Operating System). It has been classified as critical. This affects some unknown processing of the component Remote Desktop Service. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A remote code execution vulnerability exists in Remote Desktop Services - formerly known as Terminal Services - when an authenticated attacker abuses clipboard redirection, aka 'Remote Desktop Services Remote Code Execution Vulnerability'.

The weakness was published 07/09/2019 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release has been coordinated with Microsoft. This vulnerability is uniquely identified as CVE-2019-0887 since 11/26/2018. It is possible to initiate the attack remotely. Required for exploitation is a authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/07/2025). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK. The advisory points out:

A remote code execution vulnerability exists in Remote Desktop Services – formerly known as Terminal Services – when an authenticated attacker abuses clipboard redirection. An attacker who successfully exploited this vulnerability could execute arbitrary code on the victim system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

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

Similar entries are available at VDB-137539, VDB-137538, VDB-137537 and VDB-137534. Be aware that VulDB is the high quality source for vulnerability data.

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 2016
• Server 2019

License

• commercial

Website

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

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