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SharePoint’s Restricted View is designed to prevent unauthorized access to sensitive documents, but security researchers have discovered a method to bypass these restrictions using Copilot AI. This technique leverages AI-powered document processing to extract data even when direct access is blocked.
You Should Know:
How the Bypass Works
1. Copilot AI Integration:
- Copilot AI can process documents in Restricted View mode by interpreting cached or preview content.
- Attackers manipulate Copilot to extract text, metadata, or even hidden data from files.
2. Exploitation Steps:
- Upload a malicious document to SharePoint.
- Use Copilot to “analyze” the file, forcing it to parse restricted content.
- Extract data via AI-generated summaries or direct queries.
Verified Commands & Techniques
Windows (PowerShell):
Check SharePoint file permissions Get-SPOFile -ServerRelativeUrl "/sites/Example/Doc.docx" | Select-Object RestrictedView
Linux (CURL for Testing Access):
Test if a SharePoint file is accessible curl -I "https://company.sharepoint.com/sites/Example/_layouts/15/Doc.aspx"
KQL (Kusto Query for Log Analysis):
OfficeActivity | where Operation == "FilePreviewed" | where UserId contains "Copilot" | project TimeGenerated, UserId, ClientIP
Mitigation Steps
1. Disable Copilot access for sensitive SharePoint libraries.
- Enable Sensitivity Labels to enforce stricter access controls.
3. Monitor Copilot usage via Microsoft Defender logs:
CloudAppEvents | where ActionType == "AiQuery" | where RawEventData contains "SharePoint"
What Undercode Say
This bypass highlights the risks of AI-integrated features in enterprise environments. While Copilot enhances productivity, it can also be weaponized for data exfiltration. Organizations must:
– Audit AI tool permissions.
– Implement Conditional Access Policies for Copilot.
– Use DLP (Data Loss Prevention) to block unauthorized AI queries.
Prediction
As AI tools like Copilot become more embedded in workflows, attackers will increasingly exploit them for data leakage. Future bypass methods may involve deep learning-based document parsing or adversarial AI prompts.
Expected Output:
- Exploit URL: https://lnkd.in/gNTkbh7W
- Mitigation Guide: Copilot Agent Control
References:
Reported By: 0x534c Bypass – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
