CVE-2023-32841 – This vulnerability in MediaTek 5G modems allows... (How to Fix)

Q: What is the severity of CVE-2023-32841?

CVE-2023-32841 has a CVSS score of 7.5 (HIGH). This vulnerability in MediaTek 5G modems allows remote attackers to cause a system crash via malformed RRC messages, leading to denial of service. No user interaction or special privileges are required for exploitation. Affects devices using vulnerable MediaTek 5G modem chipsets.

📋 TL;DR

This vulnerability in MediaTek 5G modems allows remote attackers to cause a system crash via malformed RRC messages, leading to denial of service. No user interaction or special privileges are required for exploitation. Affects devices using vulnerable MediaTek 5G modem chipsets.

💻 Affected Systems

Products:

MediaTek 5G modem chipsets

Versions: Specific firmware versions not publicly detailed in advisory

Operating Systems: Android and other mobile OS using affected chipsets

Default Config Vulnerable: ⚠️ Yes

Notes: Affects smartphones, tablets, IoT devices, and other products using vulnerable MediaTek 5G modem chips. Exact device models not specified in public advisory.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Permanent device bricking requiring hardware replacement, complete loss of cellular connectivity, and potential cascading failures in network infrastructure.

🟠

Likely Case

Temporary denial of service causing device reboot or loss of cellular connectivity until manual restart, disrupting voice/data services.

🟢

If Mitigated

Minimal impact with proper network filtering and updated firmware preventing malformed RRC messages from reaching vulnerable devices.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires sending specially crafted RRC messages to vulnerable devices over cellular networks. No authentication required.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware with patch ID MOLY01128524

Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/December-2023

Restart Required: Yes

Instructions:

1. Contact device manufacturer for firmware updates. 2. Apply firmware update containing patch MOLY01128524. 3. Reboot device after update. 4. Verify patch installation through device settings.

🔧 Temporary Workarounds

Network filtering

all

Implement network-level filtering of malformed RRC messages at carrier infrastructure

Disable 5G connectivity

all

Switch device to 4G/LTE-only mode to avoid 5G RRC message processing

🧯 If You Can't Patch

Isolate vulnerable devices from untrusted networks
Implement strict network segmentation and monitoring for anomalous RRC traffic

🔍 How to Verify

Check if Vulnerable:

Check device firmware version against manufacturer's patched versions list. Contact device manufacturer for specific vulnerability assessment.

Check Version:

Device-specific commands vary by manufacturer. Typically: Settings > About Phone > Software Information

Verify Fix Applied:

Verify firmware version contains patch ID MOLY01128524 in device settings or through manufacturer verification tools.

📡 Detection & Monitoring

Log Indicators:

Unexpected modem resets
RRC connection failures
System crash logs mentioning modem

Network Indicators:

Anomalous RRC message patterns
Spike in RRC connection attempts from single source

SIEM Query:

source="modem_logs" AND (event="crash" OR event="reset") AND process="rrc"

📊 Metadata

CVE ID: CVE-2023-32841

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-617

Published: December 4, 2023

Last Updated: November 21, 2024

🔗 References

https://corp.mediatek.com/product-security-bulletin/December-2023 Vendor Advisory
https://corp.mediatek.com/product-security-bulletin/December-2023 Vendor Advisory

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