CVE-2019-15310
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Linkplay devices without user interaction. Attackers can retrieve AWS keys from firmware to control Linkplay's AWS infrastructure and combine this with command injection in the firmware update process. All devices with automatic updates enabled are affected.
💻 Affected Systems
- Various Linkplay firmware devices
📦 What is this software?
Linkplay by Linkplay
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Linkplay's AWS estate including S3 buckets, plus remote code execution on all vulnerable devices, potentially creating a botnet or persistent backdoor.
Likely Case
Remote code execution on vulnerable devices leading to device compromise, data theft, and potential lateral movement in networks.
If Mitigated
Limited impact if devices are isolated from internet and automatic updates are disabled.
🎯 Exploit Status
Exploitation requires combining multiple vulnerabilities: AWS key extraction and XML parsing command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check with vendor
Vendor Advisory: https://linkplay.com/
Restart Required: Yes
Instructions:
1. Contact Linkplay for patched firmware. 2. Download updated firmware. 3. Apply firmware update to all affected devices. 4. Verify update completion and device functionality.
🔧 Temporary Workarounds
Disable Automatic Updates
allPrevent devices from automatically downloading and installing potentially malicious firmware updates
Network Segmentation
allIsolate Linkplay devices from internet and critical network segments
🧯 If You Can't Patch
- Segment devices on isolated VLAN with no internet access
- Implement strict firewall rules blocking all inbound connections to devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor's patched version list. Monitor for unexpected firmware update attempts.Check Version:
Device-specific - consult manufacturer documentationVerify Fix Applied:
Verify firmware version matches patched version from vendor. Test that automatic updates can be disabled.📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware update processes
- XML parsing errors in device logs
- Unauthorized AWS API calls from device IPs
Network Indicators:
- Unusual outbound connections to AWS services
- Firmware download attempts from unexpected sources
- XML payloads in update traffic
SIEM Query:
source="linkplay-device" AND (event="firmware_update" OR event="xml_parse_error")🔗 References
- https://labs.f-secure.com/advisories/linkplay-firmware-wanlan-remote-code-execution/
- https://labs.mwrinfosecurity.com/advisories/
- https://linkplay.com/featured-products/
- https://labs.f-secure.com/advisories/linkplay-firmware-wanlan-remote-code-execution/
- https://labs.mwrinfosecurity.com/advisories/
- https://linkplay.com/featured-products/
