Vulnerability CVE-2021-27077 - CERT Civis.Net

Vulnerability Name:

CVE-2021-27077 (CCN-197728)

Assigned:

2021-03-09

Published:

2021-03-09

Updated:

2021-05-04

Summary:

Windows Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-26863, CVE-2021-26875, CVE-2021-26900.

CVSS v3 Severity:

7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: 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)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

7.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: 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)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

4.6 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2021-27077

Source: XF
Type: UNKNOWN
ms-windows-cve202127077-priv-esc(197728)

Source: CCN
Type: Microsoft Security TechCenter - March 2021
Windows Win32k Elevation of Privilege Vulnerability

Source: MISC
Type: Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27077

Source: CCN
Type: ZDI-21-287
Microsoft Windows win32kfull bStretch NULL Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-287/

Source: CCN
Type: ZDI-21-403
Microsoft Windows win32kfull MulGradientFill Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-403/

Source: CCN
Type: ZDI-21-482
Microsoft Windows win32kfull MulStrokePath Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-482/

Source: CCN
Type: ZDI-21-494
Microsoft Windows win32kfull MulStrokeAndFillPath Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-494/

Source: CCN
Type: ZDI-21-495
Microsoft Windows win32kfull MulTextOut Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-495/

Source: CCN
Type: ZDI-21-496
Microsoft Windows win32kfull MulLineTo Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-496/

Source: CCN
Type: ZDI-21-497
Microsoft Windows win32kfull MulAlphaBlend Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-497/

Source: CCN
Type: ZDI-21-498
Microsoft Windows win32kfull MulFillPath Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-498/

Source: CCN
Type: ZDI-21-499
Microsoft Windows win32kfull MulStretchBlt Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-499/

Source: CCN
Type: ZDI-21-500
Microsoft Windows win32kfull MulTransparentBlt Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-500/

Source: CCN
Type: ZDI-21-501
Microsoft Windows win32kfull MulDrawStream Untrusted Pointer Dereference Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-501/

Vulnerable Configuration:

Configuration 1:

cpe:/o:microsoft:windows_10:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:20h2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1607:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1803:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1809:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1909:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:2004:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_7:-:sp1:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_8.1:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_server_2008:r2:sp2:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

Configuration CCN 1:

cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_7:-:sp1:-:*:-:-:x32:*

OR cpe:/o:microsoft:windows_7::sp1:x64:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_8.1:-:-:-:*:-:-:x32:*

OR cpe:/o:microsoft:windows_8.1:::~~~~x64~:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:-:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10:::~~~~x64~:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1809::~~~~x64~:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:1809:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10:1803:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10:1803::~~~~x64~:*:*:*:*:*

OR cpe:/o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*

OR cpe:/o:microsoft:windows_10:1607:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10:1607::~~~~x64~:*:*:*:*:*

OR cpe:/o:microsoft:windows_10:2004:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10_2004:-:*:*:*:*:*:arm64:*

OR cpe:/o:microsoft:windows_10_2004:-:*:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_10:1909:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10_1909:-:*:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_10_1909:-:*:*:*:*:*:arm64:*

OR cpe:/o:microsoft:windows_10:20h2:*:*:*:*:*:x32:*

OR cpe:/o:microsoft:windows_10_20h2:-:*:*:*:*:*:arm64:*

OR cpe:/o:microsoft:windows_10_20h2:-:*:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server:1909:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server:2004:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server:20h2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows_server_2008:r2:*:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_server_2008:*:sp2:*:*:*:*:x64:*

OR cpe:/o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*

Denotes that component is vulnerable