CVE-2024-33066: Qualcomm Snapdragon X65 Buffer Overflow

CVE-2024-33066 Overview

CVE-2024-33066 is a critical memory corruption vulnerability affecting a wide range of Qualcomm wireless networking and modem chipset firmware. The vulnerability occurs when redirecting log files to arbitrary file locations with arbitrary file names, allowing an attacker to corrupt memory and potentially achieve full system compromise. Due to improper input validation (CWE-20), attackers can exploit this flaw remotely without requiring authentication or user interaction.

This vulnerability impacts critical infrastructure components including 5G modems, Wi-Fi chipsets, and networking processors used in enterprise routers, access points, and IoT devices. The broad attack surface combined with the network-accessible attack vector makes this vulnerability particularly dangerous for organizations deploying Qualcomm-based networking equipment.

Critical Impact

Successful exploitation could allow remote attackers to execute arbitrary code, gain complete system control, or cause denial of service across affected networking infrastructure without any authentication requirements.

Affected Products

• Qualcomm Snapdragon X65 5G Modem-RF System Firmware
• Qualcomm IPQ Series Network Processors (IPQ5xxx, IPQ6xxx, IPQ8xxx, IPQ9xxx)
• Qualcomm QCN Series Wi-Fi Chipsets (QCN5xxx, QCN6xxx, QCN9xxx)
• Qualcomm QCA Series Ethernet Controllers (QCA8xxx, QCA9xxx)
• Qualcomm Immersive Home Platform Series (214, 216, 316, 318, 326, 3210)
• Qualcomm SDX Series Modems (SDX55, SDX65M)

Discovery Timeline

• October 7, 2024 - CVE-2024-33066 published to NVD
• October 16, 2024 - Last updated in NVD database

Technical Details for CVE-2024-33066

Vulnerability Analysis

This memory corruption vulnerability stems from improper input validation in the log file redirection functionality within Qualcomm chipset firmware. When processing requests to redirect log output, the firmware fails to properly validate the destination file path and filename parameters. An attacker can exploit this weakness to write data to arbitrary memory locations, leading to memory corruption.

The vulnerability allows remote exploitation over the network without requiring any authentication or user interaction. An attacker with network access to a vulnerable device can craft malicious requests that trigger the memory corruption condition. Successful exploitation can result in complete compromise of the affected device, including the ability to execute arbitrary code with firmware-level privileges, access sensitive data processed by the chipset, or cause a denial of service condition.

Given the nature of the affected components—5G modems, Wi-Fi chipsets, and networking processors—exploitation could provide attackers with persistent access to network infrastructure, enable interception of wireless communications, or facilitate lateral movement within enterprise networks.

Root Cause

The root cause of CVE-2024-33066 is improper input validation (CWE-20) in the log file redirection handling code. The firmware does not adequately sanitize or validate the file path and filename parameters provided during log redirection operations. This allows attackers to specify malicious values that cause the firmware to write data to unintended memory locations, resulting in memory corruption that can be leveraged for code execution or other malicious purposes.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no privileges and no user interaction. An attacker can exploit this vulnerability by:

1. Identifying a network-accessible device running vulnerable Qualcomm firmware
2. Sending crafted requests to the log file redirection functionality with malicious file path/filename parameters
3. Triggering memory corruption through the improper handling of the malicious input
4. Leveraging the memory corruption to achieve code execution or cause denial of service

The vulnerability is particularly concerning because it affects networking infrastructure components that are typically exposed to network traffic, increasing the likelihood of exploitation in real-world environments. Devices such as enterprise routers, access points, and 5G equipment may be directly accessible from untrusted networks.

Detection Methods for CVE-2024-33066

Indicators of Compromise

• Unexpected device reboots or crashes in Qualcomm-based networking equipment without clear cause
• Anomalous log file activity or log files appearing in unexpected system locations
• Unusual network traffic patterns targeting management interfaces of affected devices
• Memory corruption errors or firmware exceptions in device diagnostics logs

Detection Strategies

• Deploy network monitoring to detect suspicious traffic targeting Qualcomm device management interfaces
• Implement firmware integrity monitoring to detect unauthorized modifications to affected chipset firmware
• Configure intrusion detection systems to alert on anomalous behavior from networking infrastructure devices
• Review device logs for signs of exploitation attempts including unexpected file operations or memory errors

Monitoring Recommendations

• Establish baseline behavior for Qualcomm-based network devices and alert on deviations
• Monitor for firmware update attempts from unauthorized sources
• Implement network segmentation to isolate critical networking infrastructure from untrusted networks
• Enable verbose logging on affected devices where possible to capture exploitation indicators

How to Mitigate CVE-2024-33066

Immediate Actions Required

• Inventory all Qualcomm-based networking equipment in your environment to identify vulnerable devices
• Apply firmware updates from device manufacturers that incorporate Qualcomm's security patches
• Restrict network access to management interfaces of affected devices to trusted administrative networks
• Implement network segmentation to limit exposure of vulnerable devices to untrusted networks

Patch Information

Qualcomm has addressed this vulnerability in their October 2024 Security Bulletin. Organizations should consult the Qualcomm Security Bulletin October 2024 for detailed patch information and remediation guidance. Device manufacturers that incorporate affected Qualcomm chipsets will need to release updated firmware for their products, so organizations should contact their device vendors for specific update availability.

The extensive list of affected products includes multiple generations of Qualcomm networking chipsets, Wi-Fi controllers, and 5G modems. Organizations should verify the specific chipsets used in their networking equipment to determine applicability and coordinate with device manufacturers for remediation timelines.

Workarounds

• Implement strict network access controls to limit connectivity to affected device management interfaces
• Deploy network firewalls or access control lists to block unauthorized access to vulnerable devices
• Monitor affected devices closely for signs of exploitation while awaiting firmware updates
• Consider temporary isolation of critical vulnerable devices from untrusted network segments

# Example firewall rule to restrict access to device management interface
# Adjust IP ranges and ports according to your environment
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP