Local privilege escalation
Published Oct 13, 2021 · Updated Aug 4, 2024
Improper privilege management in Microsoft Windows DWM Core Library allows local users with low privileges to gain elevated privileges. Public research identifies CCompositionGlyphRun::ProcessSetBrush as the affected locus, where a caller-controlled brush resource is accepted across multiple object subtypes before notifier registration, but it does not disclose the precise unsafe operation. Exploitation requires low local privileges and high-complexity conditions; Microsoft's vector bounds the reported consequence to confidentiality loss, without integrity or availability impact.
Summary
What happened
Improper privilege management in Microsoft Windows DWM Core Library allows local users with low privileges to gain elevated privileges. Public research identifies CCompositionGlyphRun::ProcessSetBrush as the affected locus, where a caller-controlled brush resource is accepted across multiple object subtypes before notifier registration, but it does not disclose the precise unsafe operation. Exploitation requires low local privileges and high-complexity conditions; Microsoft's vector bounds the reported consequence to confidentiality loss, without integrity or availability impact.
The record
- CVE
- CVE-2021-41339
- Published
- Oct 13, 2021
- Updated
- Aug 4, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 21H1
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 13, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.0 <10.0.19043.1288
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo