CVE-2022-28605
📋 TL;DR
CVE-2022-28605 is a critical authentication bypass vulnerability in SoundBar apps using Linkplay SDK 1.00 where a hardcoded admin token allows remote attackers to gain administrative privileges. This affects devices running the vulnerable Linkplay SDK, potentially including various smart speaker and audio products. Attackers can completely compromise affected devices without authentication.
💻 Affected Systems
- SoundBar apps using Linkplay SDK
- Various smart audio devices implementing Linkplay SDK
📦 What is this software?
Sound Bar by Linkplay
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attackers to execute arbitrary commands, steal data, install malware, or join devices to botnets.
Likely Case
Unauthorized administrative access leading to device manipulation, data exfiltration, or lateral movement in connected networks.
If Mitigated
Limited impact if devices are isolated on separate VLANs with strict network segmentation and no internet exposure.
🎯 Exploit Status
The hardcoded token can be easily extracted from firmware or discovered through reverse engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linkplay SDK versions after 1.00
Vendor Advisory: https://gist.github.com/zachi40/1f8d174939684c07f5e32ee039ce9acf
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply manufacturer-provided firmware patches. 3. Reboot devices after patching. 4. Verify token has been removed/changed.
🔧 Temporary Workarounds
Network Isolation
allIsolate affected devices on separate VLANs with strict firewall rules blocking unnecessary inbound/outbound traffic.
Access Control Lists
allImplement network ACLs to restrict device communication to only necessary services and trusted hosts.
🧯 If You Can't Patch
- Disconnect affected devices from internet and place behind strict network segmentation
- Monitor network traffic for unusual administrative access patterns or token usage
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and SDK version; devices using Linkplay SDK 1.00 are vulnerable. Attempt to authenticate using known hardcoded tokens.Check Version:
Check device management interface or manufacturer documentation for firmware/SDK version information.Verify Fix Applied:
Verify firmware has been updated to a version not using Linkplay SDK 1.00. Test that hardcoded tokens no longer provide administrative access.📡 Detection & Monitoring
Log Indicators:
- Unexpected administrative login events
- Authentication attempts using hardcoded tokens
- Unusual device configuration changes
Network Indicators:
- Administrative API calls from unexpected sources
- Traffic patterns indicating device compromise
- Communication with known malicious IPs
SIEM Query:
source="device_logs" AND (event_type="admin_login" OR token="hardcoded_token_value")