CVE-2024-10438
📋 TL;DR
The eHRD CTMS from Sunnet has an authentication bypass vulnerability that allows unauthenticated remote attackers to access restricted functionalities without valid credentials. Organizations using Sunnet's eHRD CTMS software are affected by this security flaw.
💻 Affected Systems
- Sunnet eHRD CTMS
📦 What is this software?
Ehrd Ctms by Sun.net
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to the CTMS system, potentially accessing sensitive HR data, modifying employee records, or disrupting HR operations.
Likely Case
Unauthorized access to sensitive employee data and HR management functions, leading to data breaches and compliance violations.
If Mitigated
Limited exposure if system is isolated behind strong network controls and access restrictions, though vulnerability remains present.
🎯 Exploit Status
The vulnerability allows unauthenticated access by satisfying specific conditions, suggesting relatively straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-8165-7da2f-2.html
Restart Required: Yes
Instructions:
1. Contact Sunnet for security patches. 2. Apply the provided patch to affected eHRD CTMS installations. 3. Restart the application/service. 4. Verify authentication mechanisms are functioning correctly.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict network access to the CTMS system to only trusted IP addresses
iptables -A INPUT -p tcp --dport [CTMS_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [CTMS_PORT] -j DROP
Web Application Firewall Rules
allImplement WAF rules to block authentication bypass attempts
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to the CTMS system
- Enable detailed authentication logging and implement real-time monitoring for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Attempt to access restricted CTMS functionalities without authentication while meeting the specific conditions mentioned in the advisoryCheck Version:
Check application version through admin interface or contact vendor for version verificationVerify Fix Applied:
Test authentication mechanisms thoroughly after patching to ensure unauthorized access is no longer possible📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access
- Access to restricted endpoints without authentication logs
- Unusual access patterns from unauthenticated users
Network Indicators:
- HTTP requests to sensitive endpoints without authentication headers
- Direct access to admin interfaces from unauthorized sources
SIEM Query:
source="ctms_logs" AND (event_type="auth_bypass" OR (status="200" AND auth_status="none"))