CVE-2025-1049
📋 TL;DR
A heap-based buffer overflow vulnerability in Sonos Era 300 speakers allows network-adjacent attackers to execute arbitrary code without authentication by sending specially crafted ID3 data. This affects all Sonos Era 300 speakers with vulnerable firmware. The vulnerability enables remote code execution as the anacapa user.
💻 Affected Systems
- Sonos Era 300
📦 What is this software?
S1 by Sonos
S2 by Sonos
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the speaker allowing attackers to install persistent malware, pivot to other network devices, eavesdrop on audio streams, or use the device as part of a botnet.
Likely Case
Attackers on the same network could compromise the speaker to play malicious audio, disrupt functionality, or use it as an entry point to attack other devices on the network.
If Mitigated
With proper network segmentation and access controls, impact is limited to the isolated speaker device only.
🎯 Exploit Status
Exploitation requires network adjacency and crafting of malicious ID3 data. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Sonos app for latest firmware update
Vendor Advisory: https://www.sonos.com/en-us/security
Restart Required: Yes
Instructions:
1. Open Sonos app
2. Go to Settings > System > System Updates
3. Check for updates
4. Apply any available firmware updates
5. Speaker will restart automatically
🔧 Temporary Workarounds
Network Segmentation
allIsolate Sonos speakers on separate VLAN or network segment
Disable Unnecessary Services
allDisable UPnP and restrict network services on the speaker
🧯 If You Can't Patch
- Isolate the Sonos Era 300 on a dedicated network segment with strict firewall rules
- Monitor network traffic to/from the speaker for anomalous ID3 data patterns
🔍 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 is updated to latest version and no longer shows as vulnerable in security scans📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to speaker
- Speaker restart events
- Failed update attempts
Network Indicators:
- Large or malformed ID3 data packets sent to speaker on port 1400/TCP or other Sonos ports
- Unusual outbound connections from speaker
SIEM Query:
source="sonos" AND (event="restart" OR event="error") OR dest_port=1400 AND packet_size>threshold