CVE-2025-21017
📋 TL;DR
This vulnerability allows local privileged attackers to perform out-of-bounds memory writes in the detaching crypto box component of Blockchain Keystore. It affects systems running Blockchain Keystore versions prior to 1.3.17.2, potentially enabling privilege escalation or system compromise.
💻 Affected Systems
- Blockchain Keystore
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via privilege escalation leading to arbitrary code execution as root/administrator.
Likely Case
Local privilege escalation allowing attackers to gain elevated privileges on the affected system.
If Mitigated
Limited impact with proper access controls and patched systems, restricting damage to isolated components.
🎯 Exploit Status
Requires local access and privileged credentials. Exploitation involves memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.17.2
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=08
Restart Required: No
Instructions:
1. Check current Blockchain Keystore version. 2. Update to version 1.3.17.2 via Samsung device updates. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable Blockchain Keystore Service
AndroidTemporarily disable the vulnerable service if not required
adb shell pm disable-user --user 0 com.samsung.android.kgclient
🧯 If You Can't Patch
- Restrict local access to devices through physical security and user account controls
- Implement strict privilege separation and monitor for suspicious local activity
🔍 How to Verify
Check if Vulnerable:
Check Blockchain Keystore version: adb shell dumpsys package com.samsung.android.kgclient | grep versionNameCheck Version:
adb shell dumpsys package com.samsung.android.kgclient | grep versionNameVerify Fix Applied:
Confirm version is 1.3.17.2 or higher using the same command📡 Detection & Monitoring
Log Indicators:
- Unusual process crashes in Blockchain Keystore service
- Privilege escalation attempts from local users
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Process:Blockchain Keystore AND (EventID:1000 OR EventID:1001) OR User:Local AND Privilege:Escalation