CVE-2023-48695
📋 TL;DR
This vulnerability allows remote code execution through out-of-bounds write flaws in Azure RTOS USBX's USB host and device classes, specifically affecting CDC ECM and RNDIS functionality. Attackers can exploit these flaws to execute arbitrary code on affected systems. Users of Azure RTOS USBX version 6.2.1 and below are affected.
💻 Affected Systems
- Azure RTOS USBX
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary code, potentially gaining full control over the device and accessing sensitive data or disrupting operations.
Likely Case
Remote code execution leading to device compromise, data exfiltration, or denial of service attacks against USB-connected systems.
If Mitigated
Limited impact if systems are isolated from untrusted USB devices and network interfaces, though risk remains from authorized but compromised devices.
🎯 Exploit Status
Exploitation requires sending specially crafted USB packets to vulnerable systems. No public exploit code has been disclosed as of the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.3.0
Vendor Advisory: https://github.com/azure-rtos/usbx/security/advisories/GHSA-mwj9-rpph-v8wc
Restart Required: Yes
Instructions:
1. Download USBX release 6.3.0 from the official repository. 2. Replace existing USBX files with the updated version. 3. Recompile your application with the new USBX library. 4. Deploy the updated firmware/software to all affected devices. 5. Restart devices to apply changes.
🧯 If You Can't Patch
- Disable USB CDC ECM and RNDIS functionality if not required for system operation.
- Implement network segmentation to isolate devices with vulnerable USBX implementations from critical systems.
🔍 How to Verify
Check if Vulnerable:
Check the USBX version in your source code or compiled binary. If using version 6.2.1 or earlier, you are vulnerable.Check Version:
Check the USBX source code header files or build configuration for version information (typically in ux_api.h or similar).Verify Fix Applied:
Verify that USBX version 6.3.0 or later is integrated into your system and that CDC ECM/RNDIS functionality has been updated.📡 Detection & Monitoring
Log Indicators:
- Unusual USB device connection patterns
- System crashes or unexpected reboots related to USB operations
- Memory corruption errors in system logs
Network Indicators:
- Abnormal USB traffic patterns
- Unexpected network connections from USB-connected devices
SIEM Query:
Search for USB-related error messages, memory access violations, or system crashes in device logs.