CVE-2025-21018
📋 TL;DR
CVE-2025-21018 is an out-of-bounds read vulnerability in Blockchain Keystore that allows local privileged attackers to read memory beyond allocated boundaries. This affects systems running Blockchain Keystore versions prior to 1.3.17.2, potentially exposing sensitive information to attackers with local access.
💻 Affected Systems
- Blockchain Keystore
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Privileged attacker could read sensitive cryptographic keys, passwords, or other memory contents, leading to complete system compromise or data theft.
Likely Case
Local attacker with elevated privileges reads limited memory contents, potentially exposing some sensitive information but not full system control.
If Mitigated
With proper access controls limiting local privilege escalation, impact is minimal as attackers cannot reach required privilege level.
🎯 Exploit Status
Requires local access and elevated privileges. No public exploit code available as of advisory publication.
🛠️ 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. Update Blockchain Keystore to version 1.3.17.2 via Samsung device updates. 2. Check for system updates in device settings. 3. Apply any available security patches.
🔧 Temporary Workarounds
Restrict local privilege escalation
allImplement strict access controls to prevent users from gaining elevated privileges required for exploitation.
🧯 If You Can't Patch
- Implement strict principle of least privilege for all user accounts
- Monitor for suspicious local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Blockchain Keystore version on Samsung device via Settings > Apps > Blockchain Keystore > App infoCheck Version:
adb shell dumpsys package com.samsung.android.blockchain | grep versionNameVerify Fix Applied:
Verify Blockchain Keystore version is 1.3.17.2 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns by privileged processes
- Failed attempts to access protected memory regions
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Process execution with elevated privileges accessing Blockchain Keystore memory regions