CVE-2024-56427
📋 TL;DR
This vulnerability in Samsung Exynos processors allows attackers to trigger out-of-bounds memory access by sending malformed RRC (Radio Resource Control) packets. This affects mobile devices and wearables using the listed Exynos chipsets, potentially compromising the modem subsystem.
💻 Affected Systems
- Samsung Mobile Processor Exynos 980
- Samsung Mobile Processor Exynos 990
- Samsung Mobile Processor Exynos 850
- Samsung Mobile Processor Exynos 1080
- Samsung Mobile Processor Exynos 2100
- Samsung Mobile Processor Exynos 1280
- Samsung Mobile Processor Exynos 2200
- Samsung Mobile Processor Exynos 1330
- Samsung Mobile Processor Exynos 1380
- Samsung Mobile Processor Exynos 1480
- Samsung Mobile Processor Exynos 2400
- Samsung Wearable Processor Exynos 9110
- Samsung Wearable Processor Exynos W920
- Samsung Wearable Processor Exynos W930
- Samsung Wearable Processor Exynos W1000
- Samsung Modem 5123
- Samsung Modem 5300
- Samsung Modem 5400
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on the modem processor leading to device compromise, eavesdropping on communications, or denial of service.
Likely Case
Modem crash or instability requiring device reboot, potentially disrupting cellular connectivity.
If Mitigated
Limited impact if network filtering blocks malicious RRC packets before reaching devices.
🎯 Exploit Status
Exploitation requires sending specially crafted RRC packets to the target device's modem, typically over cellular networks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Device-specific firmware updates containing modem patches
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2024-56427/
Restart Required: Yes
Instructions:
1. Check for device firmware updates from manufacturer. 2. Apply available security updates. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Network filtering
allImplement network-level filtering to block malformed RRC packets
🧯 If You Can't Patch
- Monitor for unusual modem crashes or connectivity issues
- Consider limiting device exposure to untrusted cellular networks
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched versions listCheck Version:
Device-specific (e.g., Android: Settings > About phone > Software information)Verify Fix Applied:
Confirm device has received latest security updates and modem firmware version matches patched releases📡 Detection & Monitoring
Log Indicators:
- Modem crash logs
- Unexpected baseband resets
- RRC protocol errors
Network Indicators:
- Unusual RRC packet patterns
- Suspicious cellular network traffic
SIEM Query:
Search for modem/baseband crash events or RRC protocol anomalies