Vulnerability identifier: #VU48660

Vulnerability risk: Low

CVSSv3.1: 8.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

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

Mitigation

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.

Vulnerable software versions

Windows: 7 - 7 SP1

Windows Server: 2008 R2 - 2008 R2 SP1, 2008 - 2008 SP2

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External links
http://itm4n.github.io/windows-registry-rpceptmapper-eop/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.