CVE-2021-39373
📋 TL;DR
CVE-2021-39373 is an access control bypass vulnerability in Samsung Drive Manager 2.0.104 on Samsung H3 devices that allows attackers to bypass disk management controls, potentially exposing passwords through WideCharToMultiByte, WideCharStr, and MultiByteStr functions. This affects users of Samsung H3 devices with Samsung Drive Manager version 2.0.104 installed.
💻 Affected Systems
- Samsung Drive Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to disk management functions, potentially exposing sensitive passwords and compromising the entire device's storage security.
Likely Case
Local attackers bypass access controls to view or manipulate disk partitions they shouldn't have access to, potentially exposing password data.
If Mitigated
With proper access controls and network segmentation, impact is limited to local privilege escalation within the affected application.
🎯 Exploit Status
Exploitation requires local access to the system and understanding of the access control bypass mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2.0.104
Vendor Advisory: https://github.com/bosslabdcu/Vulnerability-Reporting/security/advisories/GHSA-j3f7-346q-97f4
Restart Required: Yes
Instructions:
1. Check current Samsung Drive Manager version. 2. Download and install the latest version from Samsung's official website or update through the application. 3. Restart the system to ensure changes take effect.
🔧 Temporary Workarounds
Disable Samsung Drive Manager Service
windowsTemporarily disable the Samsung Drive Manager service to prevent exploitation until patching is possible.
sc stop "Samsung Drive Manager"
sc config "Samsung Drive Manager" start= disabled
Restrict Local Access
allImplement strict local access controls and limit user privileges on affected systems.
🧯 If You Can't Patch
- Remove Samsung Drive Manager 2.0.104 from affected Samsung H3 devices entirely.
- Implement network segmentation to isolate affected devices from critical systems.
🔍 How to Verify
Check if Vulnerable:
Check Samsung Drive Manager version in Control Panel > Programs and Features or via the application's About section.Check Version:
wmic product where name="Samsung Drive Manager" get versionVerify Fix Applied:
Verify Samsung Drive Manager version is updated to a version higher than 2.0.104 and test disk management access controls.📡 Detection & Monitoring
Log Indicators:
- Unusual disk management activity logs
- Failed access control attempts in application logs
- Multiple WideCharToMultiByte or related function calls
Network Indicators:
- Local system calls to disk management functions from unauthorized processes
SIEM Query:
EventID=4688 AND ProcessName="*DriveManager*" AND CommandLine="*WideChar*"