Remote code execution in Microsoft Windows Print Spooler



| Updated: 2022-09-04
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-1675
CWE-ID CWE-94
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 01.07.2021

Changed bulletin status to unpatched, raised bulletin risk level to reflect remote code execution, updated title and vulnerability description.

Updated: 02.07.2021

The bulletin was updated to reflect another vulnerability in the Microsoft Windows Print Spooler service. Bulletin status was reverted back to patched.

Also, the original vulnerability bound to this bulletin (#VU53886) was replaced with #VU54508 to preserve bindings to existing exploits in our database.

1) Code Injection

EUVDB-ID: #VU54508

Risk: High

CVSSv4.0: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-1675

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation within the Windows Print Spooler service. A remote attacker can trick the victim to open a specially crafted file and execute arbitrary code on the target system.

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

Note, this is a description of the original vulnerability fixed by Microsoft on June 9, 2021. A different vulnerability than #VU53886 (CVE-2021-34527) for which an exploit was made publicly available.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7 - 10 2004 10.0.19041.264

Windows Server: 2008 - 2019 2004

CPE2.3 External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.



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