Privilege escalation in Microsoft Windows RPCSS

Published: 2019-07-10 | Updated: 2019-07-10
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-1089
CWE ID CWE-20
Exploitation vector Local
Public exploit N/A
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one low risk vulnerability.

1) Input validation error

Severity: Low

CVSSv3: 6.8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-1089

CWE-ID: CWE-20 - Improper Input Validation

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when the RPC service Activation Kernel improperly handles an RPC request in rpcss.dll. A local user can create a specially crafted application, run it on the affected system and execute arbitrary code with elevated privileges.


Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, 10 1607, 10 1703, 10 1709, 10 1803, 10 1809, 10 1903, RT 8.1

Windows Server: 1803, 1903, 2008, 2008 R2, 2012, 2012 R2, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1089

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.