CVE-2024-40656
📋 TL;DR
This vulnerability in Android's ConnectionServiceWrapper allows a malicious app to access images from other user profiles on the same device through a confused deputy attack. It affects Android devices with multiple user profiles enabled. Exploitation requires user interaction but no additional privileges.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker could access sensitive images from other user profiles, potentially exposing personal photos, documents, or screenshots across user boundaries.
Likely Case
Limited information disclosure where an app could access some cross-user images, but full exploitation requires specific user actions and conditions.
If Mitigated
With proper app sandboxing and user profile isolation, impact is minimal as the vulnerability requires user interaction and doesn't bypass core security boundaries.
🎯 Exploit Status
Exploitation requires user interaction (such as accepting a conference call) and a malicious app leveraging the confused deputy pattern.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: September 2024 Android Security Patch or later
Vendor Advisory: https://source.android.com/security/bulletin/2024-09-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install September 2024 or later Android security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable multiple user profiles
androidRemove additional user profiles to eliminate the cross-user attack surface
Settings > System > Multiple users > Remove additional users
Restrict app permissions
androidReview and restrict permissions for apps that request telephony/conference capabilities
Settings > Apps > [App Name] > Permissions > Revoke unnecessary permissions
🧯 If You Can't Patch
- Isolate sensitive data to primary user profile only
- Implement strict app vetting and only install apps from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android versionCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows September 2024 or later in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Unusual cross-process image access attempts in telephony logs
- Multiple failed conference call attempts from suspicious apps
Network Indicators:
- Not applicable - local vulnerability only
SIEM Query:
Not applicable for typical enterprise monitoring as this is a local device vulnerability