CVE-2021-27077: Microsoft Windows win32kfull MulLineTo Untrusted Pointer Dereference Privilege Escalation Vulnerability
First published: Tue Mar 09 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 win32kfull.sys 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 secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| =20H2 | ||
| =20H2 | ||
| =20H2 | ||
| =20H2 | ||
| =1803 | ||
| =1809 | ||
| =1809 | ||
| =1809 | ||
| =1607 | ||
| =1607 | ||
| =1909 | ||
| =1909 | ||
| =1909 | ||
| =1909 | ||
| =1803 | ||
| =1803 | ||
| =2004 | ||
| =2004 | ||
| =2004 | ||
| =2004 | ||
| Microsoft Windows 10 | ||
| Microsoft Windows 10 | =20h2 | |
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =1803 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 7 | =sp1 | |
| Microsoft Windows 8.1 | ||
| Microsoft Windows RT 8.1 | ||
| Microsoft Windows Server 2008 | =r2-sp1 | |
| Microsoft Windows Server 2008 | =r2-sp2 | |
| Microsoft Windows Server 2012 | ||
| Microsoft Windows Server 2012 | =r2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =1909 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows |
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Reference Links
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27077
- https://www.zerodayinitiative.com/advisories/ZDI-21-287/
- https://www.zerodayinitiative.com/advisories/ZDI-21-403/
- https://www.zerodayinitiative.com/advisories/ZDI-21-482/
- https://www.zerodayinitiative.com/advisories/ZDI-21-499/
- https://www.zerodayinitiative.com/advisories/ZDI-21-494/
- https://www.zerodayinitiative.com/advisories/ZDI-21-497/
- https://www.zerodayinitiative.com/advisories/ZDI-21-501/
- https://www.zerodayinitiative.com/advisories/ZDI-21-500/
- https://www.zerodayinitiative.com/advisories/ZDI-21-496/
- https://www.zerodayinitiative.com/advisories/ZDI-21-498/
- https://www.zerodayinitiative.com/advisories/ZDI-21-495/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27077 (Advisory)
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