(Relevant Based on Post)
The LinkedIn post discusses a presentation on Microsoft Graph API during the mmsmoa event. While the post itself doesn’t provide technical details, Microsoft Graph API is a powerful tool for accessing Microsoft 365 data, making it a prime target for security research and ethical hacking.
You Should Know: Exploiting & Securing Microsoft Graph API
Microsoft Graph API allows applications to interact with Microsoft services like Azure AD, SharePoint, and Outlook. Below are key commands, exploits, and security practices:
1. Accessing Microsoft Graph API
To interact with the API, you need an access token. Use curl for testing:
curl -X GET "https://graph.microsoft.com/v1.0/me" -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
Replace `YOUR_ACCESS_TOKEN` with a valid OAuth2 token.
2. Enumerating Permissions
Check granted permissions using PowerShell:
Get-AzureADServicePrincipal -All $true | Where-Object { $_.DisplayName -eq "Microsoft Graph" } | Select -ExpandProperty Oauth2Permissions
3. Exploiting Misconfigured Apps
If an app has excessive permissions (e.g., Mail.ReadWrite), attackers can exfiltrate emails. Detect vulnerable apps with:
az ad app list --query "[].{displayName:displayName, requiredResourceAccess:requiredResourceAccess}" --output table
4. Securing Graph API Access
- Least Privilege Principle: Grant only necessary permissions.
- Monitor API Activity: Use Azure Sentinel queries:
AzureActivity | where OperationNameValue contains "Microsoft.Graph"
5. Detecting Suspicious Token Usage
Check token sign-ins in Azure AD:
Get-AzureADAuditSignInLogs -Filter "createdDateTime gt $((Get-Date).AddDays(-1))" | Where-Object { $_.AppDisplayName -eq "Microsoft Graph" }
6. Preventing Token Theft
Enable Conditional Access Policies in Azure AD:
New-AzureADMSConditionalAccessPolicy -DisplayName "Restrict Graph API Access" -State "Enabled" -Conditions $conditions -GrantControls $grantControls
What Undercode Say
Microsoft Graph API is a double-edged sword—while it enables seamless integration, misconfigurations can lead to data breaches. Ethical hackers should:
– Audit OAuth apps regularly.
– Use token logging to detect anomalies.
– Implement IP restrictions for API access.
For deeper exploitation research, check:
Prediction
As Microsoft Graph API adoption grows, attackers will increasingly target overprivileged apps. Expect a rise in OAuth phishing campaigns and token hijacking attacks in 2024.
Expected Output:
A structured guide on hacking/securing Microsoft Graph API with practical commands and defensive measures.
References:
Reported By: Stevew25 Mmsmoa – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
