Multiple vulnerabilities in Microsoft Win32k
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2022-21887 CVE-2022-21876 CVE-2022-21882 |
| CWE-ID | CWE-264 CWE-200 CWE-119 |
| Exploitation vector | Local |
| Public exploit | Vulnerability #3 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 3 vulnerabilities.
Updated: 26.01.2022
Updated vulnerability #VU59413, added additional description, added information about in the wild exploitation, raised bulletin risk level from Low to High.
1) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU59412
Risk: Low
CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21887
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in Win32k, which leads to security restrictions bypass and privilege escalation.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 11 21H2 10.0.22000.194
CPE2.3 External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21887
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.
2) Information disclosure
EUVDB-ID: #VU59414
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21876
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Win32k. A local user can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 10 Gold - 11 21H2 10.0.22000.194
Windows Server: 2012 - 2022 10.0.20348.202
CPE2.3- cpe:2.3:o:microsoft:windows:10:Gold:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10:Mobile:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10:S:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 21H1:10.0.19043.985:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 21H2:10.0.19044.1288:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1507:10.0.10240.16405:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1511:10.0.10586.3:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1703:10.0.15063.138:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21876
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.
3) Buffer overflow
EUVDB-ID: #VU59413
Risk: High
CVSSv3.1: 8.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]
CVE-ID: CVE-2022-21882
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the Win32k.sys driver. A local user can run a specially crafted program to trigger a buffer overflow and execute arbitrary code on the system with elevated privileges.
Note, the vulnerability is being actively exploited in the wild.
Install updates from vendor's website.
Vulnerable software versionsWindows: 10 S - 11 21H2 10.0.22000.194
Windows Server: 2019 10.0.17763.1 - 2022 10.0.20348.202
CPE2.3- cpe:2.3:o:microsoft:windows:10:S:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10:Gold:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10:Mobile:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 21H1:10.0.19043.985:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 21H2:10.0.19044.1288:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1507:10.0.10240.16405:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1511:10.0.10586.3:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows:10 1703:10.0.15063.138:*:*:*:*:*:
- cpe:2.3:o:microsoft:windows_server:2019 2004:*:*:*:*:*:*:
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21882
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.
