CVE-2023-45560
📋 TL;DR
This vulnerability in Yasukawa memberscard v.13.6.1 allows attackers to send crafted notifications by exploiting a leaked channel access token. Attackers can abuse this to send unauthorized notifications through the system. Organizations using the vulnerable version of this software are affected.
💻 Affected Systems
- Yasukawa memberscard
📦 What is this software?
Memberscard by Memberscard Project
⚠️ Risk & Real-World Impact
Worst Case
Attackers could send malicious notifications to all users, potentially containing phishing links or misinformation, leading to credential theft or system compromise.
Likely Case
Attackers send spam or fraudulent notifications to users, damaging trust and potentially causing operational disruption.
If Mitigated
With proper access controls and monitoring, impact is limited to notification spam that can be quickly identified and contained.
🎯 Exploit Status
Exploitation requires obtaining the leaked channel access token, which may be available through misconfiguration or other vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v.13.6.2 or later
Vendor Advisory: https://github.com/syz913/CVE-reports/blob/main/CVE-2023-45560.md
Restart Required: Yes
Instructions:
1. Download the latest version from the official vendor source. 2. Backup current configuration. 3. Install the updated version. 4. Restart the application service. 5. Verify functionality.
🔧 Temporary Workarounds
Disable Notification Channels
allTemporarily disable vulnerable notification functionality until patching is complete.
Edit configuration to set notification.enabled=false
Restrict Network Access
linuxLimit network access to notification endpoints to trusted IPs only.
iptables -A INPUT -p tcp --dport [notification_port] -s [trusted_ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [notification_port] -j DROP
🧯 If You Can't Patch
- Implement strict access controls on notification endpoints and monitor for unauthorized access attempts.
- Regularly rotate channel access tokens and audit token usage patterns for anomalies.
🔍 How to Verify
Check if Vulnerable:
Check if running Yasukawa memberscard v.13.6.1 and if notification channels are configured with potentially leaked tokens.Check Version:
Check application configuration file or admin interface for version information.Verify Fix Applied:
Verify version is v.13.6.2 or later and test notification functionality with proper authentication.📡 Detection & Monitoring
Log Indicators:
- Unusual notification sending patterns
- Failed authentication attempts on notification endpoints
- Access from unexpected IP addresses
Network Indicators:
- Unexpected traffic to notification endpoints
- Notification payloads with suspicious content
SIEM Query:
source="memberscard" AND (event="notification_sent" AND user="unknown" OR ip NOT IN [trusted_ips])