CVE-2023-31114
📋 TL;DR
This vulnerability in Samsung Exynos modem chips allows a crafted application to improperly query SIM card status information. It affects devices using Exynos 5123 and 5300 modems, potentially exposing sensitive SIM data to unauthorized applications.
💻 Affected Systems
- Samsung devices with Exynos 5123 modem
- Samsung devices with Exynos 5300 modem
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of SIM card data including IMSI, location information, and authentication credentials, leading to subscriber impersonation or tracking.
Likely Case
Unauthorized access to SIM status information allowing tracking of device location and subscriber identification.
If Mitigated
Limited information leakage if proper application sandboxing and permission controls are enforced.
🎯 Exploit Status
Requires crafting a malicious application that can interact with the modem component. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Baseband firmware updates from Samsung
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/
Restart Required: Yes
Instructions:
1. Check for device manufacturer security updates. 2. Apply latest firmware updates from Samsung. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Application permission restrictions
androidRestrict applications from accessing modem/SIM-related permissions
Disable unnecessary modem features
androidTurn off RCS and other advanced messaging features if not needed
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks
- Implement strict application whitelisting and vetting procedures
🔍 How to Verify
Check if Vulnerable:
Check device modem/baseband version in Settings > About Phone > Baseband versionCheck Version:
adb shell getprop gsm.version.basebandVerify Fix Applied:
Verify baseband firmware version matches patched version from Samsung security bulletin📡 Detection & Monitoring
Log Indicators:
- Unusual modem/SIM access attempts from applications
- Multiple SIM status query failures
Network Indicators:
- Unexpected SIM registration attempts
- Abnormal RCS protocol traffic
SIEM Query:
source="android_logs" AND (event="modem_access" OR event="sim_query") AND result="denied"