CVE-2025-25758
📋 TL;DR
This vulnerability in KukuFM Android app allows attackers to extract sensitive cleartext data from the app's backup files. It affects all users of KukuFM Android version 1.12.7 (11207) who have Android backup enabled on their devices.
💻 Affected Systems
- KukuFM Android
📦 What is this software?
Kukufm by Kukufm
⚠️ Risk & Real-World Impact
Worst Case
Attackers with physical access to the device or malware with backup permissions can extract authentication tokens, personal data, payment information, and other sensitive cleartext data stored by the app.
Likely Case
Malicious apps with backup permissions or attackers with physical device access can extract user credentials, listening history, preferences, and other personal data stored in cleartext.
If Mitigated
With proper Android backup security controls and encryption, only authorized backup processes can access the data, limiting exposure.
🎯 Exploit Status
Requires backup system access or physical device access. No public exploit code identified in references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after v1.12.7 (11207)
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Update KukuFM Android app to latest version from Google Play Store. 2. Verify android:allowBackup="false" or proper backup encryption is implemented in newer versions.
🔧 Temporary Workarounds
Disable Android backup for KukuFM
AndroidPrevent the app from creating vulnerable backup files
adb shell bmgr backupnow com.kukufm.android
adb shell bmgr transport com.google.android.backup/.BackupTransportService
Enable Android backup encryption
AndroidEnsure device backup encryption is enabled to protect backup data
adb shell settings put secure backup_transport android/com.android.internal.backup.LocalTransport
adb shell bmgr enable true
🧯 If You Can't Patch
- Disable Android backup completely on affected devices
- Implement mobile device management (MDM) to control backup permissions and monitor for suspicious backup activity
🔍 How to Verify
Check if Vulnerable:
Check AndroidManifest.xml for android:allowBackup="true" in KukuFM app package. Use: adb shell dumpsys package com.kukufm.android | grep allowBackupCheck Version:
adb shell dumpsys package com.kukufm.android | grep versionNameVerify Fix Applied:
Verify android:allowBackup="false" in updated app or check that backup files are encrypted. Use same command as above.📡 Detection & Monitoring
Log Indicators:
- Unauthorized backup operations
- Multiple backup attempts from unknown sources
- Backup size anomalies for KukuFM app
Network Indicators:
- Unusual backup data transfers to unauthorized destinations
- Backup traffic during non-scheduled times
SIEM Query:
source="android_backup" AND app="com.kukufm.android" AND (event="unauthorized_access" OR size>threshold)