CVE-2021-42682
📋 TL;DR
This integer overflow vulnerability in Accops HyWorks DVM Tools allows local attackers to execute arbitrary code with kernel privileges or crash the operating system via specially crafted I/O requests. It affects systems running HyWorks DVM Tools prior to version 3.3.1.105. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Accops HyWorks DVM Tools
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via kernel-mode arbitrary code execution leading to persistent backdoors, data theft, or ransomware deployment.
Likely Case
Privilege escalation from standard user to SYSTEM/root privileges, enabling lateral movement and persistence establishment.
If Mitigated
Limited impact if proper access controls prevent local user access to vulnerable systems.
🎯 Exploit Status
Exploit requires local access but is relatively straightforward to implement given the public technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.1.105 and later
Vendor Advisory: https://www.sentinelone.com/labs/usb-over-ethernet-multiple-privilege-escalation-vulnerabilities-in-aws-and-other-major-cloud-services/
Restart Required: Yes
Instructions:
1. Download HyWorks DVM Tools version 3.3.1.105 or later from official vendor sources. 2. Uninstall previous versions. 3. Install the updated version. 4. Restart the system.
🔧 Temporary Workarounds
Restrict local user access
windowsLimit which users can log into systems running vulnerable HyWorks DVM Tools
Disable unnecessary USB-over-Ethernet functionality
windowsRemove or disable HyWorks DVM Tools if not required for business operations
🧯 If You Can't Patch
- Implement strict least-privilege access controls to prevent unauthorized local logins
- Monitor for suspicious local privilege escalation attempts using endpoint detection tools
🔍 How to Verify
Check if Vulnerable:
Check HyWorks DVM Tools version in Control Panel > Programs and Features or via 'wmic product get name,version' commandCheck Version:
wmic product where "name like '%HyWorks%'" get name,versionVerify Fix Applied:
Verify installed version is 3.3.1.105 or higher and check system stability after patch application📡 Detection & Monitoring
Log Indicators:
- Unusual IOCTL 0x22001B calls in system logs
- Unexpected driver crashes or system reboots
- Privilege escalation events in security logs
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
EventID=4688 AND (NewProcessName LIKE '%cmd.exe%' OR NewProcessName LIKE '%powershell.exe%') AND SubjectUserName!=SYSTEM AND TokenElevationType=%%1938