CVE-2023-27355
📋 TL;DR
This is a critical buffer overflow vulnerability in Sonos One Speaker's MPEG-TS parser that allows network-adjacent attackers to execute arbitrary code as root without authentication. The vulnerability affects Sonos One Speaker version 70.3-35220 and potentially other versions. Attackers can exploit this by sending specially crafted MPEG-TS data to trigger the buffer overflow.
💻 Affected Systems
- Sonos One Speaker
📦 What is this software?
S1 by Sonos
S2 by Sonos
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Sonos speaker with root-level code execution, allowing attackers to pivot to other network devices, install persistent malware, or use the device as part of a botnet.
Likely Case
Remote code execution leading to device compromise, data exfiltration, or use in DDoS attacks against internal network resources.
If Mitigated
Limited impact if devices are isolated on separate VLANs with strict network segmentation and access controls.
🎯 Exploit Status
No authentication required, network-adjacent access needed. The vulnerability is straightforward to exploit once the buffer overflow details are understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Sonos official advisory for specific patched version
Vendor Advisory: https://www.sonos.com/en-us/security/advisories
Restart Required: Yes
Instructions:
1. Open Sonos app 2. Go to Settings > System > System Updates 3. Check for updates 4. Apply available updates 5. Restart all Sonos devices
🔧 Temporary Workarounds
Network Segmentation
allIsolate Sonos devices on separate VLAN with strict firewall rules
Disable Unnecessary Services
allDisable UPnP and restrict network services to minimum required
🧯 If You Can't Patch
- Segment Sonos devices on isolated network VLAN with strict firewall rules blocking all unnecessary inbound traffic
- Implement network monitoring and intrusion detection for anomalous traffic patterns to/from Sonos devices
🔍 How to Verify
Check if Vulnerable:
Check Sonos app: Settings > System > About My System to see if version is 70.3-35220 or earlierCheck Version:
Not applicable - use Sonos mobile app interfaceVerify Fix Applied:
After update, verify version in Sonos app shows a version newer than 70.3-35220📡 Detection & Monitoring
Log Indicators:
- Unusual network traffic patterns to Sonos devices
- Multiple failed MPEG-TS parsing attempts
- Unexpected device reboots or crashes
Network Indicators:
- Unusual MPEG-TS traffic to Sonos devices on port 1400
- Anomalous outbound connections from Sonos devices
- Buffer overflow patterns in network traffic
SIEM Query:
source_ip=* AND dest_ip=sonos_device_ip AND (port=1400 OR protocol=mpeg-ts) AND size>threshold