CVE-2023-20819 – This vulnerability in the CDMA PPP protocol all... (How to Fix)

Q: What is the severity of CVE-2023-20819?

CVE-2023-20819 has a CVSS score of 9.8 (CRITICAL). This vulnerability in the CDMA PPP protocol allows remote attackers to execute arbitrary code without user interaction by exploiting an out-of-bounds write due to missing bounds checks. It affects devices using MediaTek chipsets with vulnerable firmware. Successful exploitation could lead to complete system compromise.

📋 TL;DR

This vulnerability in the CDMA PPP protocol allows remote attackers to execute arbitrary code without user interaction by exploiting an out-of-bounds write due to missing bounds checks. It affects devices using MediaTek chipsets with vulnerable firmware. Successful exploitation could lead to complete system compromise.

💻 Affected Systems

Products:

MediaTek chipsets with CDMA PPP implementation

Versions: Specific firmware versions not publicly detailed in bulletin

Operating Systems: Android and other embedded systems using MediaTek chips

Default Config Vulnerable: ⚠️ Yes

Notes: Affects devices with CDMA cellular connectivity using vulnerable MediaTek firmware.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to full device compromise, data theft, and persistent backdoor installation.

🟠

Likely Case

Device crash (DoS) or limited code execution depending on exploit sophistication.

🟢

If Mitigated

Limited impact if network segmentation prevents direct access to vulnerable interfaces.

🌐 Internet-Facing: HIGH - No authentication required and remote exploitation possible.

🏢 Internal Only: HIGH - Can be exploited from internal networks without user interaction.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires understanding of CDMA PPP protocol but no authentication or user interaction needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware with patch ID MOLY01068234

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

Restart Required: Yes

Instructions:

1. Contact device manufacturer for firmware updates. 2. Apply firmware patch MOLY01068234. 3. Reboot device after update.

🔧 Temporary Workarounds

Network segmentation

all

Isolate devices from untrusted networks to limit attack surface

Disable CDMA if unused

all

Disable CDMA cellular connectivity if not required for device function

🧯 If You Can't Patch

Implement strict network access controls to limit exposure
Monitor for abnormal network traffic patterns from affected devices

🔍 How to Verify

Check if Vulnerable:

Check device firmware version against manufacturer's patched versions

Check Version:

Device-specific commands vary by manufacturer (check settings > about phone for Android devices)

Verify Fix Applied:

Verify firmware version includes patch ID MOLY01068234

📡 Detection & Monitoring

Log Indicators:

Unexpected device reboots
Crash logs mentioning PPP or CDMA components

Network Indicators:

Unusual CDMA PPP traffic patterns
Malformed PPP packets

SIEM Query:

Search for device crash events with CDMA or PPP keywords in system logs

📊 Metadata

CVE ID: CVE-2023-20819

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-787

Published: October 2, 2023

Last Updated: November 21, 2024

🔗 References

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

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🔗 Related Vulnerabilities

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