Multiple vulnerabilities in Microsoft Win32k
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-34516 CVE-2021-34491 CVE-2021-34449 |
| CWE-ID | CWE-822 CWE-200 CWE-264 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
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.
1) Untrusted Pointer Dereference
EUVDB-ID: #VU54798
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-2021-34516
CWE-ID:
CWE-822 - Untrusted Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to untrusted pointer dereference in DrvTransparentBltInternal() within the Microsoft Windows Canonical Display Driver cdd.dll. A local user can run a specially crafted program to execute arbitrary code with SYSTEM privileges.
Install updates from vendor's website.
Vulnerable software versionsWindows: 7 - 10 2004
Windows Server: 2008 - 2019 2004
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34516
http://www.zerodayinitiative.com/advisories/ZDI-21-895/
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: #VU54799
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-2021-34491
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 the Win32k. A local user can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 8.1 - 10 2004
Windows Server: 2012 R2 - 2019 2004
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34491
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) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU54800
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-2021-34449
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 the Win32k, which leads to security restrictions bypass and privilege escalation.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 10 20H2 - 10 2004
Windows Server: 2019 - 2019 2004
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34449
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.
