CVE-2021-43419
📋 TL;DR
The Opay Mobile application versions 1.5.1.26 and potentially higher expose sensitive information through Android's logcat system. This allows attackers with physical access to the device or malware to read sensitive data like authentication tokens, personal information, and transaction details. All users of affected Opay app versions are vulnerable to information disclosure.
💻 Affected Systems
- Opay Mobile Application
📦 What is this software?
Opay by Opayweb
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal authentication tokens, financial transaction details, personal identification information, and account credentials, leading to complete account takeover, financial fraud, and identity theft.
Likely Case
Malicious apps or users with physical access could extract sensitive user data including partial financial information, authentication tokens, and personal details from the device logs.
If Mitigated
With proper logging controls and app hardening, only non-sensitive debug information would be exposed, preventing meaningful data leakage.
🎯 Exploit Status
Exploitation requires either physical device access or malware with logcat permissions. Public proof-of-concept demonstrates information extraction from logcat output.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - users should update to latest version from official app stores
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Open Google Play Store 2. Search for Opay app 3. Click Update if available 4. Restart the app after update
🔧 Temporary Workarounds
Disable Developer Options/Logcat
androidDisable Android developer options and USB debugging to prevent logcat access
Settings > Developer Options > Toggle off
Settings > Developer Options > USB Debugging > Toggle off
Use App Permissions Manager
androidRestrict logcat access for all apps using permission management tools
🧯 If You Can't Patch
- Uninstall the Opay app and use alternative payment applications
- Enable device encryption and use strong authentication (PIN/password/biometrics) to prevent physical access
🔍 How to Verify
Check if Vulnerable:
Install affected Opay version, enable USB debugging, run 'adb logcat | grep -i opay' and check for sensitive data in outputCheck Version:
Open Opay app > Settings > About or check app info in Android SettingsVerify Fix Applied:
Update to latest Opay version, repeat logcat command, verify no sensitive information appears in logs📡 Detection & Monitoring
Log Indicators:
- Excessive logcat entries containing 'opay', 'token', 'auth', 'password', 'account', or financial data
- Unauthorized logcat access attempts
Network Indicators:
- Unusual data exfiltration patterns from mobile device
- Suspicious app requesting logcat permissions
SIEM Query:
device.platform:android AND (process.name:logcat OR event.action:log_access) AND (target.app:opay OR message:*opay*)