CVE-2023-5443
📋 TL;DR
This vulnerability in EDM Informatics E-invoice software allows attackers to obtain sensitive information through improper protection of error messages and alerts. It enables account footprinting, potentially revealing user account details. Organizations using E-invoice versions before 2.1 are affected.
💻 Affected Systems
- EDM Informatics E-invoice
📦 What is this software?
E Invoice by E Invoice Project
⚠️ Risk & Real-World Impact
Worst Case
Attackers could enumerate valid user accounts, leading to credential stuffing attacks, targeted phishing campaigns, or unauthorized access to sensitive financial data.
Likely Case
Information disclosure allowing attackers to identify valid user accounts and potentially gather intelligence for further attacks.
If Mitigated
Limited information leakage with proper network segmentation and monitoring in place.
🎯 Exploit Status
CWE-1320 typically involves low-complexity attacks that exploit error message leakage.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1
Vendor Advisory: https://www.usom.gov.tr/bildirim/tr-23-0610
Restart Required: Yes
Instructions:
1. Download E-invoice version 2.1 or later from official vendor sources. 2. Backup current installation and data. 3. Install the updated version following vendor documentation. 4. Restart the application/service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to E-invoice application to trusted networks only
Web Application Firewall Rules
allConfigure WAF to filter error messages and prevent information leakage
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the E-invoice application
- Enable detailed logging and monitoring for unusual error message patterns or enumeration attempts
🔍 How to Verify
Check if Vulnerable:
Check E-invoice version in application settings or configuration files. If version is below 2.1, system is vulnerable.Check Version:
Check application interface or configuration files for version informationVerify Fix Applied:
Confirm version is 2.1 or higher in application settings and test that error messages no longer leak sensitive account information.📡 Detection & Monitoring
Log Indicators:
- Unusual patterns of error messages, multiple failed login attempts with detailed error responses, enumeration attempts
Network Indicators:
- Unusual traffic patterns to error endpoints, repeated requests with varying parameters
SIEM Query:
source="e-invoice" AND (message="error" OR message="failed") | stats count by src_ip, user_agent