Main Vulnerability Database Vulnerabilities #VU48660

#VU48660 Security restrictions bypass in Windows and Windows Server

Published: November 26, 2020

Vulnerability identifier: #VU48660

Vulnerability risk: Low

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear

CVE-ID: N/A

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
Windows
Windows Server

Software vendor:
Microsoft

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect permissions set for two registry keys for the RPC Endpoint Mapper and DNSCache services. A local user can modify keys a leverage behavior of other system services to load a malicious DLL and execute arbitrary code with SYSTEM privileges.

Affected registry keys are:

HKLMSYSTEMCurrentControlSetServicesRpcEptMapper
HKLMSYSTEMCurrentControlSetServicesDnscache

Remediation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

As a remediation, change permissions on the registry keys and disable access to these keys for unprivileged users.

External links

https://itm4n.github.io/windows-registry-rpceptmapper-eop/