CVE-2021-25440
📋 TL;DR
This vulnerability in Samsung's FactoryCameraFB app allows untrusted applications to access arbitrary files with elevated privileges due to improper access control. It affects Samsung devices running vulnerable versions of the FactoryCameraFB app prior to version 3.4.74. Attackers can exploit this to read sensitive system files they shouldn't have access to.
💻 Affected Systems
- Samsung devices with FactoryCameraFB app
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise through reading sensitive system files, credential theft, or privilege escalation leading to full control of the Samsung device.
Likely Case
Unauthorized access to sensitive user data, configuration files, or system information that could enable further attacks.
If Mitigated
Limited impact with proper app sandboxing and access controls preventing unauthorized file access.
🎯 Exploit Status
Exploitation requires a malicious app to be installed on the device. The vulnerability is well-documented in security blogs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FactoryCameraFB version 3.4.74 or later
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=7
Restart Required: Yes
Instructions:
1. Update Samsung device to latest firmware. 2. Ensure FactoryCameraFB app is updated to version 3.4.74 or later via Samsung app store. 3. Restart device after update.
🔧 Temporary Workarounds
Disable FactoryCameraFB app
androidDisable the vulnerable FactoryCameraFB app if not needed
adb shell pm disable-user --user 0 com.sec.factory.camera
Restrict app installations
androidOnly install apps from trusted sources like Google Play Store
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks
- Implement application allowlisting to prevent malicious app installation
🔍 How to Verify
Check if Vulnerable:
Check FactoryCameraFB app version: Settings > Apps > FactoryCameraFB > App infoCheck Version:
adb shell dumpsys package com.sec.factory.camera | grep versionNameVerify Fix Applied:
Verify FactoryCameraFB version is 3.4.74 or higher📡 Detection & Monitoring
Log Indicators:
- Unauthorized file access attempts from FactoryCameraFB app
- Suspicious app installation events
Network Indicators:
- Unusual data exfiltration from device
SIEM Query:
source="android_logs" app="FactoryCameraFB" action="file_access" result="denied"