Kernel information disclosure via uncounted alignment padding
Published Oct 11, 2022 · Updated Jan 2, 2025
DFS information disclosure in Microsoft Windows 11 and Server 2022 allows local users to read kernel memory via a crafted FSCTL request. DfscFsctrlCreateDriveLetter omits alignment padding from its Extra EA bounds calculation, causing a read of up to 14 bytes beyond the system buffer. Low-privileged local access is required, and crafted AuthIdentity offsets can relay the disclosed kernel bytes through an SMB connection.
Summary
What happened
DFS information disclosure in Microsoft Windows 11 and Server 2022 allows local users to read kernel memory via a crafted FSCTL request. DfscFsctrlCreateDriveLetter omits alignment padding from its Extra EA bounds calculation, causing a read of up to 14 bytes beyond the system buffer. Low-privileged local access is required, and crafted AuthIdentity offsets can relay the disclosed kernel bytes through an SMB connection.
The record
- CVE
- CVE-2022-38025
- Published
- Oct 11, 2022
- Updated
- Jan 2, 2025
- Vendor
- Microsoft
- Product
- Windows 11 version 21H2
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 11, 2022CVE publishedPublication date reported by the CVE source.
- Jan 2, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=10.0.0 <10.0.22000.1098
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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
No sourced classifications are available.
Public exploit references
- LeakLess DFS client out-of-bounds-read demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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