CVE-2020-14107
📋 TL;DR
This vulnerability is a stack overflow in the HTTP server of Cast that can be exploited via LAN to cause application crashes. It affects Cast devices and applications that use the vulnerable HTTP server component. Attackers on the same local network can trigger denial of service conditions.
💻 Affected Systems
- Cast devices and applications using the vulnerable HTTP server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, though this is not confirmed in available advisories.
Likely Case
Denial of service causing application crashes and service disruption on affected Cast devices.
If Mitigated
Limited to denial of service with proper network segmentation and access controls.
🎯 Exploit Status
Stack overflow vulnerabilities typically require minimal exploitation complexity when triggered via network requests
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references, check vendor advisory for specific patched versions
Vendor Advisory: https://trust.mi.com/zh-CN/misrc/bulletins/advisory?cveId=92
Restart Required: Yes
Instructions:
1. Check for firmware updates for your Cast device
2. Apply the latest available firmware update
3. Restart the device after update completion
🔧 Temporary Workarounds
Network Segmentation
allIsolate Cast devices on separate VLANs or network segments to limit attack surface
Disable Unnecessary Services
allDisable HTTP server if not required for device functionality
🧯 If You Can't Patch
- Segment Cast devices on isolated network segments
- Implement network access controls to restrict LAN access to Cast devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor's patched version listCheck Version:
Check device settings or use manufacturer's device management interfaceVerify Fix Applied:
Verify firmware version matches or exceeds patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- HTTP server crash logs
- Unusual HTTP request patterns to Cast devices
- Memory corruption error messages
Network Indicators:
- Unusual HTTP traffic to Cast device ports
- Multiple malformed HTTP requests from single source
SIEM Query:
source_ip="*" AND dest_ip="cast_device_ip" AND (http_request CONTAINS "malformed" OR http_status="500")