Low
CVE-2022-21839
CVE ID
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CVE-2022-21839
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
Windows Event Tracing Discretionary Access Control List Denial of Service Vulnerability
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Ratings
-
Attacker ValueLow
-
ExploitabilityHigh
Technical Analysis
This appears to be a bug in Windows Event Tracing which is a kernel level tracing facility in Windows that allows you to log kernel events or application defined events to a log file. The bug occurs due to something related to Discretionary Access Control Lists or DACLS for short. DACLs in Windows are an access control mechanism made up of a bunch of ACE, or Access Control Entries, put together into a list. Note however that if a DACL does not exist on an object, everyone is allowed access to it and if a DACL is set on an object but not ACE entries are added to the DACL, no one is allowed access to it.
My guess is that somehow it is possible to create a DACL on a specific file or object as any authenticated user that does not have any ACE entries associated with it and thereby cause a component to stop working completely due to its need to access that file. Adding to the fact that this only causes a DoS, is the fact that this bug supposedly only works on Windows 10 1809 and Windows Server 2019, which further limits its impact.
Overall a pretty low impact bug in my opinion.
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General Information
Vendors
- microsoft
Products
- windows 10 1809,
- windows server 2019 -
References
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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