CVE-2024-20127
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in Telephony components that could allow remote attackers to cause denial of service without user interaction. The vulnerability affects systems using MediaTek chipsets with vulnerable telephony implementations. Attackers can exploit this remotely to crash telephony services.
💻 Affected Systems
- MediaTek chipset-based devices with telephony functionality
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker could cause persistent denial of service to telephony services, disrupting voice calls, SMS, and mobile data connectivity on affected devices.
Likely Case
Remote denial of service causing temporary telephony service disruption until system restart or service recovery.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external exploitation attempts.
🎯 Exploit Status
Exploitation requires sending specially crafted telephony protocol messages to vulnerable systems. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID ALPS09289881 applied
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/December-2024
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply MediaTek-provided patch ALPS09289881. 3. Update device firmware to latest version. 4. Reboot device after update.
🔧 Temporary Workarounds
Network segmentation
allRestrict access to telephony services from untrusted networks
Firewall rules
allBlock unnecessary telephony protocol traffic from external sources
🧯 If You Can't Patch
- Implement strict network access controls to telephony services
- Monitor for unusual telephony protocol traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and patch level against MediaTek security bulletin. Look for patch ALPS09289881 in applied patches.Check Version:
Device-specific commands vary by manufacturer. Typically: Settings > About phone > Build number/Software informationVerify Fix Applied:
Verify patch ALPS09289881 is listed in applied security patches and device firmware is updated to version containing the fix.📡 Detection & Monitoring
Log Indicators:
- Telephony service crashes
- Unusual telephony protocol errors
- System logs showing out-of-bounds memory access
Network Indicators:
- Unusual telephony protocol traffic patterns
- Malformed telephony packets from external sources
SIEM Query:
source="telephony" AND (event_type="crash" OR error_code="out_of_bounds")