Summary
Impact: Security Feature Bypass. Microsoft rating: Moderate. Exploited according to Microsoft — Exploitation Detected. Customer action: Required.
Details
According to the CVSS metric, successful exploitation of this vulnerability could lead to some loss of integrity (I:L) and some loss of availability (A:L). What does that mean for this vulnerability?
An attacker can craft a malicious file that would evade Mark of the Web (MOTW) defenses, resulting in a limited loss of integrity and availability of security features such as Protected View in Microsoft Office, which rely on MOTW tagging.
What is the relationship between Mark of the Web and Windows SmartScreen?
When you download a file from the internet, Windows adds the zone identifier or Mark of the Web as an NTFS stream to the file. So, when you run the file, Windows SmartScreen checks if there is a zone identifier Alternate Data Stream (ADS) attached to the file. If the ADS indicates ZoneId=3 which means that the file was downloaded from the internet, the SmartScreen does a reputation check. For more information on SmartScreen, please visit Microsoft Defender SmartScreen overview | Microsoft Learn.
Security updates
10.0.17763.4131 — https://support.microsoft.com/help/5023702
10.0.20348.1607 — https://support.microsoft.com/help/5023705
10.0.20348.1602 — https://support.microsoft.com/help/5023786
10.0.19042.2728 — https://support.microsoft.com/help/5023696
10.0.22000.1696 — https://support.microsoft.com/help/5023698
10.0.22621.1413 — https://support.microsoft.com/help/5023706
10.0.14393.5786 — https://support.microsoft.com/help/5023697
Vulnerabilities 1
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Medium 4.4
Windows SmartScreen Security Feature Bypass Vulnerability
Windows SmartScreen Security Feature Bypass Vulnerability
KEV Mar 14, 2023
Revision history
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#2
Updated one or more CVSS scores for the affected products. This is an informational change only.
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#1
Information published.
References
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CVE-2023-24880 Windows SmartScreen Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24880
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss