CVE-2020-1166: Windows Clipboard Service Elevation of Privilege Vulnerability
An elevation of privilege vulnerability exists when Windows improperly handles calls to Clipboard Service, aka 'Windows Clipboard Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1111, CVE-2020-1121, CVE-2020-1165.
Other sources
An elevation of privilege vulnerability exists when Windows improperly handles calls to Clipboard Service. An attacker who successfully exploited this vulnerability could run arbitrary code in the security context of the local system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control over an affected system. The update addresses the vulnerability by correcting how Windows handles calls to Clipboard Service.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch KB4556799
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must first be able to log on to the affected system and run a specially crafted application. The CVSS vector indicates local access and low privileges are required; no user interaction is required.
What level of access could an attacker gain?
Successful exploitation allows arbitrary code execution in the security context of Local System. This could let the attacker install programs, access or alter data, or create accounts with full user rights.
What is the remediation?
Apply the security update that corrects how Windows handles calls to the Clipboard Service. The provided data identifies Microsoft Windows 10 and Microsoft Windows Server 2016 among the affected software.