CVE-2023-49927
📋 TL;DR
A vulnerability in Samsung Exynos baseband software allows improper format type checking in RRC (Radio Resource Control) messages, potentially leading to unencrypted communications. This affects Samsung mobile devices, wearables, and modems using specific Exynos processors. Attackers could exploit this to intercept or manipulate cellular network traffic.
💻 Affected Systems
- Samsung Mobile Processor
- Samsung Wearable Processor
- Samsung Modem
- Exynos 980
- Exynos 990
- Exynos 850
- Exynos 1080
- Exynos 2100
- Exynos 2200
- Exynos 1280
- Exynos 1380
- Exynos 1330
- Exynos 9110
- Exynos W920
- Exynos Modem 5123
- Exynos Modem 5300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete interception of cellular communications including voice calls, SMS, and mobile data without encryption, enabling eavesdropping, data theft, and man-in-the-middle attacks.
Likely Case
Partial interception of unencrypted network traffic in specific scenarios, potentially exposing sensitive information transmitted over cellular networks.
If Mitigated
Limited impact with proper network segmentation and monitoring, though fundamental encryption bypass remains possible.
🎯 Exploit Status
Exploitation requires proximity to target device and knowledge of cellular network protocols. No public exploit code available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Device-specific firmware updates from Samsung
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/
Restart Required: Yes
Instructions:
1. Check for device firmware updates in Settings > Software Update. 2. Apply available security updates. 3. For enterprise devices, use MDM to push updates. 4. Contact Samsung for modem firmware updates if applicable.
🔧 Temporary Workarounds
Disable vulnerable cellular bands
androidTemporarily disable affected cellular network bands if device supports band locking
*#*#4636#*#* on Android to access testing menu
Set preferred network type to LTE only or specific bands
Use Wi-Fi calling
allRoute voice and data through Wi-Fi instead of cellular when possible
Enable Wi-Fi calling in device settings
🧯 If You Can't Patch
- Replace affected devices with patched models or alternative processors
- Implement network monitoring for unusual cellular traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device model and processor in Settings > About phone. If using affected Exynos processor, assume vulnerable until patched.Check Version:
adb shell getprop ro.build.fingerprint (for Android devices)Verify Fix Applied:
Verify security patch level in Settings > About phone > Software information. Look for patches dated after vulnerability disclosure.📡 Detection & Monitoring
Log Indicators:
- Baseband crash logs
- Unexpected RRC protocol errors
- Radio interface layer anomalies
Network Indicators:
- Unencrypted cellular traffic detection
- Abnormal RRC message patterns
- Man-in-the-middle cellular attacks
SIEM Query:
Device logs showing baseband firmware version matching affected Exynos processors