High
CVE-2022-21882
CVE ID
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High
(1 user assessed)
Moderate
(1 user assessed)Unknown
Unknown
Unknown
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Description
Win32k Elevation of Privilege Vulnerability. This CVE ID is unique from CVE-2022-21887.
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Ratings
-
Attacker ValueHigh
-
ExploitabilityMedium
Technical Analysis
Looks like this is a LPE in win32k that is being exploited in the wild according to Microsoft to let attackers escalate their privileges to SYSTEM. Attack complexity on this is high which is understandable given the history of win32k and the complexities regarding its architecture which was built before modern security mitigations were implemented. With that being said though the finder of this bug, at https://twitter.com/b2ahex/status/1481233350840893442, notes that exploitation is easy and that this is a patch bypass for CVE-2021-1732, which was a window object type confusion leading to an OOB (out-of-bounds) write as noted by McAfee’s technical writeup at https://www.mcafee.com/blogs/enterprise/mcafee-enterprise-atr/technical-analysis-of-cve-2021-1732/.
Of particular note here is that they credit Big CJTeam of Tianfu Cup and RyeLv aka @b2ahex on Twitter for finding this vulnerability. They note that this was exploited in the wild but the mention of Tianfu Cup is interesting as it suggests this was also reported to China’s government via the Chinese Tianfu Cup hacking competition.
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Vendors
- Microsoft
Products
- Windows,
- Windows Server,
- Windows 10 Version 1909 for 32-bit Systems,
- Windows 10 Version 1909 for x64-based Systems,
- Windows 10 Version 1909 for ARM64-based Systems,
- Windows 10 Version 21H1 for x64-based Systems,
- Windows 10 Version 21H1 for ARM64-based Systems,
- Windows 10 Version 21H1 for 32-bit Systems,
- Windows Server 2022,
- Windows Server 2022 (Server Core installation),
- Windows 10 Version 20H2 for x64-based Systems,
- Windows 10 Version 20H2 for 32-bit Systems,
- Windows 10 Version 20H2 for ARM64-based Systems,
- Windows Server, version 20H2 (Server Core Installation),
- Windows 11 for x64-based Systems,
- Windows 11 for ARM64-based Systems,
- Windows 10 Version 21H2 for 32-bit Systems,
- Windows 10 Version 21H2 for ARM64-based Systems,
- Windows 10 Version 21H2 for x64-based Systems
Exploited in the Wild
- Vendor Advisory (https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-21882)
- Government or Industry Alert (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
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Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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