CVE-2024-25634
📋 TL;DR
This vulnerability in alf.io ticket reservation system allows attackers to access email logs from other organizers' events through specially crafted requests. It affects all alf.io installations prior to version 2.0-M4-2402. Attackers can potentially view sensitive email communications between organizers and attendees.
💻 Affected Systems
- alf.io
📦 What is this software?
Alf by Alf
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive email communications containing personal data, payment information, or confidential event details from multiple organizers, leading to data breaches and privacy violations.
Likely Case
Attackers access email logs from other organizers, potentially exposing attendee email addresses, communication content, and event details that should be private.
If Mitigated
With proper access controls and monitoring, impact is limited to unauthorized viewing of email logs without ability to modify or delete data.
🎯 Exploit Status
Exploitation requires crafting specific requests but appears straightforward based on advisory description. No authentication bypass is mentioned.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0-M4-2402
Vendor Advisory: https://github.com/alfio-event/alf.io/security/advisories/GHSA-5wcv-pjc6-mxvv
Restart Required: Yes
Instructions:
1. Backup your current alf.io installation and database. 2. Download version 2.0-M4-2402 or later from the official repository. 3. Replace existing files with new version. 4. Restart the alf.io application server. 5. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to alf.io application to trusted IP addresses only
iptables -A INPUT -p tcp --dport [alf.io-port] -s [trusted-ip-range] -j ACCEPT
iptables -A INPUT -p tcp --dport [alf.io-port] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate alf.io from untrusted networks
- Enable detailed logging and monitoring for unusual access patterns to email log endpoints
🔍 How to Verify
Check if Vulnerable:
Check alf.io version in application settings or via version file. If version is earlier than 2.0-M4-2402, system is vulnerable.Check Version:
Check application settings or look for version information in the web interface or configuration files.Verify Fix Applied:
After patching, verify version shows 2.0-M4-2402 or later. Test that authenticated users cannot access email logs from other organizers' events.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to email log endpoints
- Requests attempting to access organizer IDs not associated with current user
- Multiple failed attempts followed by successful access to email logs
Network Indicators:
- HTTP requests to email log endpoints with modified organizer parameters
- Unusual traffic patterns to /api/ endpoints related to email logs
SIEM Query:
source="alf.io" AND (uri_path="/api/email-logs" OR uri_path="/api/admin/email") AND organizer_id!=user_organizer_id