CVE-2021-47717
📋 TL;DR
IntelliChoice eFORCE Software Suite 2.5.9 contains a username enumeration vulnerability that allows attackers to determine valid user accounts by analyzing responses to authentication attempts. This affects organizations using the vulnerable version of the eFORCE software suite.
💻 Affected Systems
- IntelliChoice eFORCE Software Suite
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could enumerate all valid usernames, enabling targeted password attacks, credential stuffing, or social engineering campaigns against identified users.
Likely Case
Attackers will enumerate valid usernames to facilitate credential-based attacks, potentially leading to unauthorized access to user accounts.
If Mitigated
With proper controls like rate limiting and monitoring, impact is limited to information disclosure about account existence.
🎯 Exploit Status
Exploit involves sending POST requests with different usernames to the vulnerable parameter and analyzing response differences.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.eforcesoftware.com
Restart Required: No
Instructions:
1. Check vendor website for security updates. 2. Apply any available patches. 3. Verify the fix by testing the vulnerability.
🔧 Temporary Workarounds
Implement Rate Limiting
allLimit authentication attempts per IP address to prevent automated username enumeration.
Web Application Firewall Rules
allConfigure WAF to block requests targeting the vulnerable parameter or detect enumeration patterns.
🧯 If You Can't Patch
- Restrict access to the application using network segmentation or VPN.
- Implement multi-factor authentication to reduce impact of credential attacks.
🔍 How to Verify
Check if Vulnerable:
Send POST requests to the login endpoint with different usernames in the 'ctl00$MainContent$UserName' parameter and compare response times or content.Check Version:
Check application version in web interface or configuration files.Verify Fix Applied:
Test the same enumeration technique after applying fixes; responses should not reveal valid usernames.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with different usernames from same source
- Unusual patterns of authentication requests
Network Indicators:
- HTTP POST requests to login endpoint with varying usernames
- Traffic spikes to authentication endpoints
SIEM Query:
source_ip=* AND (http_method=POST AND uri_path CONTAINS 'login' AND user_agent NOT IN ["normal_user_agents"]) | stats count by source_ip