Detection bypass via forged signature database update
Published Apr 14, 2023 · Updated Jan 23, 2025
Security feature bypass in Microsoft Malware Protection Platform before 4.18.2303.8 allows local users to evade selected malware detections. The public proof of concept edits Defender VDM definition files to remove chosen threat signatures, increments their version, and loads them through MpSigStub as a simulated update. Local access requires neither privileges nor user interaction; the CNA reports confidentiality impact without direct integrity or availability impact.
Summary
What happened
Security feature bypass in Microsoft Malware Protection Platform before 4.18.2303.8 allows local users to evade selected malware detections. The public proof of concept edits Defender VDM definition files to remove chosen threat signatures, increments their version, and loads them through MpSigStub as a simulated update. Local access requires neither privileges nor user interaction; the CNA reports confidentiality impact without direct integrity or availability impact.
The record
- CVE
- CVE-2023-24934
- Published
- Apr 14, 2023
- Updated
- Jan 23, 2025
- Vendor
- Microsoft
- Product
- Microsoft Malware Protection Platform
- Classifications
- CWE-306, T1562.001
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2023CVE publishedPublication date reported by the CVE source.
- Jan 23, 2025Record 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=4.0.0.0 <4.18.2303.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- wd-pretenderfunctional · demonstrated
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
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