CVE-2025-55621
📋 TL;DR
An Insecure Direct Object Reference (IDOR) vulnerability in Reolink v4.54.0.4.20250526 allows unauthorized users to access and download other users' profile photos by manipulating URL parameters. This affects users of the Reolink platform who have uploaded profile photos. The vendor disputes this as a vulnerability, claiming it's intentional social platform behavior.
💻 Affected Systems
- Reolink
📦 What is this software?
Reolink by Reolink
⚠️ Risk & Real-World Impact
Worst Case
Mass harvesting of user profile photos leading to privacy violations, potential identification of users, and reputational damage to the platform.
Likely Case
Limited unauthorized access to profile photos, minor privacy concerns for affected users, and potential social engineering opportunities.
If Mitigated
No impact if proper access controls are implemented to verify user permissions before serving profile photos.
🎯 Exploit Status
Exploitation requires understanding URL structure and parameter manipulation, but no authentication bypass is needed beyond the IDOR.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not applicable - vendor disputes vulnerability
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available as vendor considers this intentional behavior. Consider implementing access controls if concerned about privacy.
🔧 Temporary Workarounds
Implement Access Control Checks
allAdd server-side authorization checks to verify the requesting user has permission to access specific profile photos before serving them.
Use Obfuscated Identifiers
allReplace sequential or predictable user IDs in URLs with random, non-guessable identifiers to prevent IDOR exploitation.
🧯 If You Can't Patch
- Monitor access logs for unusual patterns of profile photo downloads
- Implement rate limiting on profile photo endpoints to prevent mass harvesting
🔍 How to Verify
Check if Vulnerable:
Attempt to access another user's profile photo by modifying user ID parameters in profile photo URLs while authenticated as a different user.Check Version:
Check application version in settings or about pageVerify Fix Applied:
Verify that modifying user ID parameters in URLs no longer allows access to unauthorized profile photos.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authorization attempts for profile photos
- Unusual patterns of profile photo downloads from single IP addresses
- Access to profile photos with mismatched user session IDs
Network Indicators:
- HTTP requests to profile photo endpoints with modified user ID parameters
- Unusual volume of traffic to profile photo endpoints
SIEM Query:
source="web_logs" AND (uri_path="/profile/photo/*" OR uri_path="/avatar/*") AND (user_id!=session_user_id OR referer="")