CVE-2023-32610
📋 TL;DR
CVE-2023-32610 is a denial-of-service vulnerability in Mailform Pro CGI versions 4.3.1.2 and earlier that allows remote unauthenticated attackers to crash the service. This affects organizations using vulnerable versions of Mailform Pro CGI for web form processing. The vulnerability requires no authentication and can be triggered remotely.
💻 Affected Systems
- Mailform Pro CGI
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption making web forms unavailable, potentially affecting business operations and customer communications.
Likely Case
Temporary service outage requiring manual restart of the CGI service or web server.
If Mitigated
Minimal impact if service is behind rate limiting, WAF, or load balancer with DoS protection.
🎯 Exploit Status
No authentication required, making exploitation trivial if vulnerable version is exposed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.1.3 or later
Vendor Advisory: https://www.synck.com/blogs/news/newsroom/detail_1686638620.html
Restart Required: Yes
Instructions:
1. Download latest version from vendor site. 2. Backup current installation. 3. Replace files with patched version. 4. Restart web server/CGI service.
🔧 Temporary Workarounds
Network Access Control
allRestrict access to Mailform Pro CGI endpoint to trusted IPs only
Rate Limiting
allImplement rate limiting at web server or WAF level to prevent DoS attempts
🧯 If You Can't Patch
- Isolate the vulnerable system behind a reverse proxy with DoS protection
- Implement aggressive monitoring and alerting for service restarts
🔍 How to Verify
Check if Vulnerable:
Check Mailform Pro CGI version in administration interface or by examining script files for version markersCheck Version:
grep -r 'version\|VERSION' /path/to/mailform/cgi/ 2>/dev/null || echo 'Check admin interface'Verify Fix Applied:
Confirm version is 4.3.1.3 or later and test form submission functionality📡 Detection & Monitoring
Log Indicators:
- Multiple rapid requests to mailform.cgi endpoint
- Web server/CGI process crashes or restarts
- Error logs showing malformed requests
Network Indicators:
- Unusual traffic patterns to form submission endpoints
- High volume of requests from single IPs
SIEM Query:
source="web_logs" AND uri="*mailform.cgi*" AND (status=500 OR bytes_sent=0) | stats count by src_ip🔗 References
- https://jvn.jp/en/jp/JVN70502982/index.html
- https://www.synck.com/blogs/news/newsroom/detail_1686638620.html
- https://www.synck.com/downloads/cgi-perl/mailformpro/feature_1361268679.html
- https://jvn.jp/en/jp/JVN70502982/index.html
- https://www.synck.com/blogs/news/newsroom/detail_1686638620.html
- https://www.synck.com/downloads/cgi-perl/mailformpro/feature_1361268679.html
