Privilege escalation in Windows Error Reporting

Published: 2019-05-14 | Updated: 2019-05-14
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-0863
CWE ID CWE-20
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Severity: Medium

CVSSv3: 7.5 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-0863

CWE-ID: CWE-20 - Improper Input Validation

Description

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

The vulnerability exists due to the way Windows Error Reporting (WER) handles files. A local user can create a specially crafted WER file and execute arbitrary code on the system in kernel mode.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Install updates 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 R2, 2012, 2012 R2, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0863

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?

Yes. This vulnerability is being exploited in the wild.