(0Day) Microsoft Windows OneDrive SmartScreen Bypass Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to bypass the Mark-of-the-Web protection mechanism on affected installations of Microsoft Windows. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the implementation of OneDrive file syncing. When syncing files from the cloud to the local filesystem, OneDrive neither applies nor preserves the Mark-of-the-Web on files originating from untrusted locations. An attacker can leverage this vulnerability to bypass SmartScreen protection and execute arbitrary code in the context of the current user.
Additional Details
06/06/24 – ZDI reported the vulnerability to the vendor
06/06/24 – the vendor acknowledged the receipt of the report
07/10/24 – the vendor rated the severity of the vulnerability to be Low and communicated that the issues did not meet the bar for immediate servicing
07/31/25 – ZDI notified the vendor of the intention to publish the cases as a 0-day advisory
-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the product.
Disclosure Timeline
- 2024-06-06 - Vulnerability reported to vendor
- 2025-08-06 - Coordinated public release of advisory
- 2025-08-06 - Advisory Updated
Credit
Peter Girnus (@gothburz) - Trend Micro Zero Day Initiative
