Security restrictions bypass in Windows and Windows Server - #VU48660

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Main Vulnerability Database Vulnerabilities #VU48660

Security restrictions bypass in Windows and Windows Server - #VU48660

Published: November 26, 2020


Vulnerability identifier: #VU48660
CSH Severity: Low
CVSS v4.0: 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
Vendor: Microsoft
Affected software:
Windows
Windows Server

Detailed vulnerability 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.


Sources