CVE-2021-44124
📋 TL;DR
This directory traversal vulnerability in Hiby Music Hiby OS allows attackers to access arbitrary files on the device's filesystem via the HTTP server. Attackers can navigate outside the intended SD card directory to read sensitive system files. This affects users of Hiby R3 Pro music players running vulnerable firmware versions.
💻 Affected Systems
- Hiby Music Hiby OS R3 Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of device confidentiality - attackers can read all files including configuration files, credentials, and user data stored on the device.
Likely Case
Unauthorized access to sensitive files stored on the SD card and device filesystem, potentially exposing personal data and device configuration.
If Mitigated
Limited to accessing only intended SD card directories with proper input validation and path sanitization.
🎯 Exploit Status
Exploitation requires network access to the device's HTTP server (port 80 by default). Attackers can use simple HTTP requests with directory traversal sequences like '../' to access files outside the intended directory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Check Hiby's official website or firmware updates for potential fixes. Consider workarounds if no patch exists.
🔧 Temporary Workarounds
Disable HTTP Server
allTurn off the HTTP server functionality that serves SD card content
Navigate to device settings > Network > HTTP Server > Disable
Network Segmentation
allIsolate the device on a separate VLAN or network segment to limit attack surface
🧯 If You Can't Patch
- Disconnect device from untrusted networks and only use on isolated, trusted networks
- Regularly monitor device logs for unusual HTTP requests containing directory traversal patterns
🔍 How to Verify
Check if Vulnerable:
Test by accessing the device's HTTP server and attempting to navigate outside the SD card directory using '../' sequences in URLsCheck Version:
Check firmware version in device settings: Settings > System > About > Firmware VersionVerify Fix Applied:
Verify that directory traversal attempts are blocked and return appropriate error responses instead of file contents📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' sequences
- Access to files outside expected SD card paths
- Failed file access attempts with traversal patterns
Network Indicators:
- HTTP requests to device with directory traversal payloads
- Unusual file access patterns from external IPs
SIEM Query:
http.url:*../* AND destination.port:80 AND device.vendor:"Hiby"