CVE-2023-27352
📋 TL;DR
This vulnerability allows attackers on the same network to execute arbitrary code with root privileges on Sonos One speakers without authentication. The flaw exists in how the speaker processes SMB directory queries, enabling remote code execution. Only Sonos One speakers running vulnerable firmware are affected.
💻 Affected Systems
- Sonos One Speaker
📦 What is this software?
S1 by Sonos
S2 by Sonos
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root-level access, allowing attackers to install persistent malware, steal data, or use the device as a pivot point into the network.
Likely Case
Attackers on the local network gain root access to the speaker, potentially using it for surveillance, data exfiltration, or as part of a botnet.
If Mitigated
With proper network segmentation and access controls, impact is limited to the isolated IoT network segment.
🎯 Exploit Status
Exploit requires sending crafted SMB directory queries to the vulnerable service. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 70.3-35230 and later
Vendor Advisory: https://support.sonos.com/en-us/article/sonos-security-update-february-2023
Restart Required: Yes
Instructions:
1. Open Sonos app 2. Go to Settings > System > System Updates 3. Check for updates 4. Install available update 5. Restart speaker
🔧 Temporary Workarounds
Network Segmentation
allIsolate Sonos speakers on separate VLAN without access to critical network segments
Disable SMB Services
allDisable SMB file sharing features if not required
🧯 If You Can't Patch
- Physically disconnect from network if not in use
- Implement strict network access controls to limit which devices can communicate with Sonos speakers
🔍 How to Verify
Check if Vulnerable:
Check firmware version in Sonos app: Settings > System > About My SystemCheck Version:
Not applicable - use Sonos app interfaceVerify Fix Applied:
Verify firmware version is 70.3-35230 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual SMB protocol traffic to Sonos devices
- Multiple failed SMB directory queries
Network Indicators:
- Anomalous SMB traffic patterns to port 445 on Sonos IPs
- Crafted SMB directory query packets
SIEM Query:
source_ip=* dest_ip=sonos_device_ip dest_port=445 protocol=SMB query_type="DIRECTORY_QUERY"