CVE-2023-27779
📋 TL;DR
AM Presencia v3.7.3 contains a SQL injection vulnerability in the login form's user parameter, allowing attackers to execute arbitrary SQL commands. This affects all systems running this specific version of AM Presencia software. Successful exploitation could lead to authentication bypass, data theft, or complete system compromise.
💻 Affected Systems
- AM Presencia
📦 What is this software?
Am Presencia by Amsystem
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data exfiltration, privilege escalation to administrative access, and potential remote code execution on the underlying server.
Likely Case
Authentication bypass allowing unauthorized access to the system, followed by data extraction from the database and potential lateral movement within the network.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection, though authentication attempts may still be logged.
🎯 Exploit Status
SQL injection in login form typically requires minimal technical skill to exploit using standard SQLi techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://amsystem.es/
Restart Required: No
Instructions:
1. Check vendor website for security updates. 2. Apply any available patches. 3. Test the login functionality after patching.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy a WAF with SQL injection protection rules to block malicious login attempts.
Input Validation Filter
allImplement server-side input validation to reject suspicious characters in the user parameter.
🧯 If You Can't Patch
- Implement parameterized queries or prepared statements in the login functionality
- Deploy network segmentation to isolate the AM Presencia system from critical assets
🔍 How to Verify
Check if Vulnerable:
Test the login form with SQL injection payloads like ' OR '1'='1 in the username field and observe if authentication bypass occurs.Check Version:
Check the software version in the application interface or configuration files.Verify Fix Applied:
Retest with the same SQL injection payloads after applying fixes; successful authentication should be blocked.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with SQL keywords
- Unusual database query patterns from the application server
- Successful logins from unexpected IP addresses
Network Indicators:
- HTTP POST requests to login endpoint containing SQL syntax
- Abnormal database traffic from web server
SIEM Query:
source="web_logs" AND (uri="/login" OR uri="/auth") AND (request_body CONTAINS "' OR" OR request_body CONTAINS "' UNION" OR request_body CONTAINS "' SELECT")🔗 References
- http://alo.com
- https://amsystem.es/
- https://docs.google.com/document/d/1kGzmc6AOCfRzJf9mDz4emkhQj84Y1XemmAMZjYK32-o/edit?usp=sharing
- https://portalempleado.alosuite.com/home
- http://alo.com
- https://amsystem.es/
- https://docs.google.com/document/d/1kGzmc6AOCfRzJf9mDz4emkhQj84Y1XemmAMZjYK32-o/edit?usp=sharing
- https://portalempleado.alosuite.com/home
