Privilege escalation in Microsoft Windows Custom Protocol Engine

1) Buffer overflow

EUVDB-ID: #VU45605

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1527

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when the Windows Custom Protocol Engine improperly handles memory. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 10 1607 10.0.14393.10 - 10

Windows Server: 2016 10.0.14393.10 - 2019 2004

CPE2.3

• cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1709:10.0.16299.19:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1903:10.0.18362.116:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1909:10.0.18363.476:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 2004:10.0.19041.264:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.10:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:2019 2004:*:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1527

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.