CVE-2024-20018: MediaTek SDK Privilege Escalation Flaw

CVE-2024-20018 Overview

CVE-2024-20018 is an out-of-bounds write vulnerability in the MediaTek WLAN driver caused by improper input validation. This memory corruption flaw allows attackers to write data beyond the allocated buffer boundaries, potentially leading to local escalation of privilege. Notably, this vulnerability requires no additional execution privileges and does not require user interaction for successful exploitation.

Critical Impact

This vulnerability enables local privilege escalation through the WLAN driver without requiring user interaction or additional privileges, making it highly exploitable on affected MediaTek devices.

Affected Products

• MediaTek Software Development Kit
• MediaTek MT7615 Chipset
• Devices utilizing MediaTek WLAN drivers with vulnerable SDK versions

Discovery Timeline

• 2024-03-04 - CVE-2024-20018 published to NVD
• 2024-03-04 - MediaTek releases security patch (Patch ID: WCNCR00348479)
• 2025-04-22 - Last updated in NVD database

Technical Details for CVE-2024-20018

Vulnerability Analysis

This vulnerability (tracked as Issue ID: MSV-1019) resides in the MediaTek WLAN driver component, which handles wireless networking functionality on MediaTek-based devices. The flaw stems from insufficient input validation when processing certain data within the driver, allowing an attacker to trigger an out-of-bounds write condition.

CWE-787 (Out-of-bounds Write) vulnerabilities occur when software writes data past the end of allocated memory, potentially corrupting adjacent memory structures, overwriting critical program data, or modifying control flow data to achieve code execution.

Root Cause

The root cause is improper input validation within the WLAN driver code. When the driver processes certain input without adequately validating buffer boundaries, it permits write operations that exceed the allocated memory region. This lack of bounds checking enables attackers to manipulate memory outside the intended buffer space.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity. An attacker can potentially exploit this flaw remotely without requiring any authentication or user interaction. The attack targets the WLAN driver's input handling routines, where malformed or malicious input data can trigger the out-of-bounds write condition.

The exploitation flow typically involves:

1. Sending specially crafted wireless packets or driver commands
2. The WLAN driver processes the input without proper bounds validation
3. Memory corruption occurs as data is written beyond buffer boundaries
4. The attacker gains elevated privileges through the corrupted memory state

Due to the network-accessible nature of the WLAN driver and the lack of required privileges or user interaction, this vulnerability presents a significant attack surface for devices utilizing affected MediaTek components.

Detection Methods for CVE-2024-20018

Indicators of Compromise

• Unexpected kernel crashes or system instability related to WLAN driver operations
• Anomalous memory allocation patterns or corruption in kernel space
• Unusual privilege escalation events originating from wireless subsystem processes
• WLAN driver error logs indicating buffer overflows or memory access violations

Detection Strategies

• Monitor kernel logs for WLAN driver-related crashes or memory corruption errors
• Implement runtime memory protection mechanisms to detect out-of-bounds access attempts
• Deploy endpoint detection solutions capable of identifying privilege escalation attempts
• Enable kernel address sanitizer (KASAN) on development/test systems to catch memory violations

Monitoring Recommendations

• Configure centralized logging to aggregate WLAN driver events across affected devices
• Establish baseline behavior patterns for WLAN driver operations to detect anomalies
• Implement network traffic analysis to identify potentially malicious wireless packets targeting the vulnerability
• Deploy SentinelOne agents on affected systems for real-time behavioral monitoring and automated threat response

How to Mitigate CVE-2024-20018

Immediate Actions Required

• Apply the security patch (Patch ID: WCNCR00348479) from MediaTek immediately
• Update MediaTek SDK to the latest patched version as specified in the March 2024 security bulletin
• Review device firmware versions and prioritize updates for network-exposed devices
• Consider temporarily disabling WLAN functionality on critical systems until patching is complete

Patch Information

MediaTek has addressed this vulnerability in their March 2024 Product Security Bulletin. The fix is tracked under Patch ID: WCNCR00348479 and Issue ID: MSV-1019. Organizations using MediaTek chipsets should obtain the patched SDK or firmware from MediaTek or their device vendor. For complete details, refer to the MediaTek Security Bulletin March 2024.

Workarounds

• Limit network exposure of affected devices by placing them behind firewalls or network segmentation
• Disable unnecessary WLAN functionality on devices where wireless connectivity is not required
• Implement network access controls to restrict potential attack vectors
• Monitor affected systems closely for signs of exploitation until patches can be applied

# Example: Disable WLAN interface temporarily on Linux-based systems
# This may vary depending on device implementation
ifconfig wlan0 down
# Or using ip command
ip link set wlan0 down

# Verify interface status
ip link show wlan0