CVE-2023-24544
📋 TL;DR
An improper access control vulnerability in Buffalo network switches allows network-adjacent attackers to access specific files, potentially enabling unauthorized configuration changes. This affects multiple Buffalo Gigabit switch models with firmware versions before specified patches. Organizations using these switches in their networks are at risk.
💻 Affected Systems
- BS-GSL2024
- BS-GSL2016P
- BS-GSL2016
- BS-GS2008
- BS-GS2016
- BS-GS2024
- BS-GS2048
- BS-GS2008P
- BS-GS2016P
- BS-GS2024P
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains administrative control of network switches, enabling traffic interception, network segmentation bypass, denial of service, or deployment of persistent backdoors.
Likely Case
Unauthorized configuration changes leading to network disruption, VLAN hopping, or exposure of sensitive network information.
If Mitigated
Limited impact with proper network segmentation and access controls preventing lateral movement to vulnerable switches.
🎯 Exploit Status
No authentication required, but attacker must be network-adjacent. Specific exploit details not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BS-GSL series: Ver. 1.10-0.04; BS-GS series: Ver. 1.0.10.02
Vendor Advisory: https://www.buffalo.jp/news/detail/20230310-01.html
Restart Required: Yes
Instructions:
1. Download latest firmware from Buffalo support site. 2. Log into switch web interface. 3. Navigate to firmware update section. 4. Upload and apply new firmware. 5. Switch will reboot automatically.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable switches to separate VLANs with strict access controls
Access Control Lists
allImplement ACLs to restrict management access to trusted IP addresses only
🧯 If You Can't Patch
- Segment vulnerable switches to isolated network segments with strict firewall rules
- Implement network monitoring for unauthorized configuration changes to affected switches
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI: System Information > Firmware VersionCheck Version:
Via web interface: System Information page; CLI command varies by modelVerify Fix Applied:
Confirm firmware version matches patched versions: BS-GSL series ≥1.10-0.04, BS-GS series ≥1.0.10.02📡 Detection & Monitoring
Log Indicators:
- Unauthorized configuration changes
- Unexpected firmware access attempts
- Multiple failed login attempts followed by configuration changes
Network Indicators:
- Unexpected traffic patterns from switch management interfaces
- Configuration file access from unauthorized IPs
SIEM Query:
source="buffalo_switch" AND (event_type="config_change" OR event_type="file_access") AND user="unknown"