CVE-2021-34516: Microsoft Windows Canonical Display Driver DrvStrokeAndFillPath Untrusted Pointer Dereference Privilege Escalation Vulnerability
First published: Tue Jul 13 2021(Updated: )
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the cdd.dll driver. The issue results from dereferencing a NULL pointer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows Server | =2004 | |
| Microsoft Windows 7 | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows Server | =20H2 | |
| Microsoft Windows 7 | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Microsoft Windows 8.1 | ||
| Microsoft Windows 8.1 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2019 | ||
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1607 | |
| Windows 10 | =1607 | |
| Windows 10 | =21H1 | |
| Windows 10 | =21H1 | |
| Windows 10 | =21H1 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | ||
| Windows 10 | ||
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | ||
| Windows 10 | =20h2 | |
| Windows 10 | =21h1 | |
| Windows 10 | =1607 | |
| Windows 10 | =1809 | |
| Windows 10 | =1909 | |
| Windows 10 | =2004 | |
| Microsoft Windows 7 | =sp1 | |
| Microsoft Windows | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server | =sp2 | |
| Microsoft Windows Server | =r2-sp1 | |
| Microsoft Windows Server | ||
| Microsoft Windows Server | =r2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Operating System |
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Reference Links
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34516
- https://www.zerodayinitiative.com/advisories/ZDI-21-895/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1019/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1005/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1017/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1006/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1008/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1007/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1021/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1009/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1018/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1004/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1020/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1016/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1022/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1015/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1011/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1010/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1013/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1014/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1012/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34516 (Advisory)
- https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-34516
Frequently Asked Questions
What is the severity of CVE-2021-34516?
CVE-2021-34516 is rated critical as it allows local attackers to escalate privileges in affected Microsoft Windows installations.
How do I fix CVE-2021-34516?
To fix CVE-2021-34516, apply the latest security updates provided by Microsoft for the affected Windows versions.
What versions of Windows are affected by CVE-2021-34516?
CVE-2021-34516 impacts various versions of Microsoft Windows including Windows 10, Windows 7, and Windows Server 2019.
What types of attacks are possible due to CVE-2021-34516?
CVE-2021-34516 allows attackers with low-privilege code execution capabilities to gain elevated privileges on the system.
Is CVE-2021-34516 exploitable remotely or locally?
CVE-2021-34516 is a local privilege escalation vulnerability, meaning it requires local access to the system to exploit.
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