CVE-2025-65185
📋 TL;DR
This vulnerability in Entrinsik Informer v5.10.1 allows attackers to enumerate valid usernames by analyzing application responses during OTP and password reset processes. It affects organizations using vulnerable versions of Entrinsik Informer for business intelligence and reporting. The impact is limited to information disclosure rather than authentication bypass.
💻 Affected Systems
- Entrinsik Informer
📦 What is this software?
Informer by Entrinsik
⚠️ Risk & Real-World Impact
Worst Case
Attackers could map all valid usernames in the system, facilitating targeted phishing, brute force attacks, or social engineering campaigns against specific individuals.
Likely Case
Attackers discover some valid usernames, potentially enabling more focused credential stuffing or password spraying attacks against those accounts.
If Mitigated
With proper monitoring and rate limiting, attackers might only discover a few usernames before detection, limiting the attack's effectiveness.
🎯 Exploit Status
Exploitation requires no authentication and involves simple HTTP requests with different username/OTP combinations and analyzing response differences.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://entrinsik.com
Restart Required: No
Instructions:
1. Check Entrinsik website for security updates
2. Apply any available patches
3. Verify the fix by testing username enumeration
4. Monitor for any service disruptions
🔧 Temporary Workarounds
Implement Rate Limiting
allLimit login attempts per IP address to prevent automated username enumeration
Standardize Error Responses
allConfigure application to return identical responses for valid and invalid usernames during OTP/password reset
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block username enumeration patterns
- Enable detailed logging of all authentication attempts and monitor for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Test the OTP/password reset functionality with known valid and invalid usernames. If responses differ (timing, error messages, HTTP codes), the system is vulnerable.Check Version:
Check Informer web interface or configuration files for version informationVerify Fix Applied:
Repeat the enumeration test. Responses should be identical regardless of username validity (same timing, same error messages, same HTTP status codes).📡 Detection & Monitoring
Log Indicators:
- Multiple failed OTP/password reset attempts with different usernames from same source
- Unusual pattern of authentication requests
Network Indicators:
- HTTP POST requests to authentication endpoints with varying usernames
- Abnormal request rates to login/OTP endpoints
SIEM Query:
source_ip=* AND (url_path="/login" OR url_path="/otp" OR url_path="/reset") AND status_code=400|401 AND count() > 10 per minute