CVE-2022-46329: Intel Killer Privilege Escalation Flaw

CVE-2022-46329 Overview

CVE-2022-46329 is a protection mechanism failure vulnerability affecting Intel PROSet/Wireless WiFi software, Intel Killer, and related UEFI firmware components. This vulnerability allows a privileged user with local access to potentially escalate their privileges, gaining unauthorized control over system resources and potentially compromising system integrity.

Critical Impact

A privileged attacker with local access can exploit protection mechanism failures in Intel wireless WiFi software to achieve privilege escalation, potentially gaining elevated system access and compromising confidentiality, integrity, and availability of affected systems.

Affected Products

• Intel PROSet/Wireless WiFi Software
• Intel Killer Wireless Software
• Intel UEFI Firmware for WiFi components
• Intel Wi-Fi 6 AX201 adapters
• Fedora Linux 37, 38, and 39
• Debian Linux 10.0

Discovery Timeline

• 2023-08-11 - CVE-2022-46329 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-46329

Vulnerability Analysis

This vulnerability is classified under CWE-693 (Protection Mechanism Failure), indicating that the security mechanisms intended to protect sensitive operations within the Intel wireless WiFi software stack are not functioning as designed. The flaw exists in the way the software handles protection mechanisms, allowing an attacker who already has privileged access to the local system to bypass security controls and escalate their privileges further.

The vulnerability requires local access and high privileges to exploit, meaning an attacker would need to have already compromised the system to some degree. However, once exploited, the vulnerability can lead to complete compromise of system confidentiality, integrity, and availability. This makes it particularly concerning in enterprise environments where lateral movement and privilege escalation are common attack patterns.

Root Cause

The root cause of CVE-2022-46329 lies in improper implementation or failure of protection mechanisms within the Intel wireless software stack. The software fails to adequately enforce security boundaries, allowing privileged users to access or modify resources that should be protected. This protection mechanism failure is particularly dangerous because it affects low-level system components including UEFI firmware, which operates at a fundamental level of the system architecture.

Attack Vector

The attack vector for this vulnerability is local access. An attacker must have physical or remote access to the target system with elevated privileges. The exploitation process involves:

1. Gaining initial privileged access to a system running vulnerable Intel wireless software
2. Exploiting the protection mechanism failure to bypass security controls
3. Escalating privileges to gain unauthorized access to protected system resources
4. Potentially modifying UEFI firmware or wireless driver components to maintain persistence

The vulnerability does not require user interaction, making it exploitable automatically once an attacker has the necessary local access and privileges.

The protection mechanism failure manifests in the Intel wireless software stack where security boundaries between privileged operations are not properly enforced. Attackers with existing elevated privileges can leverage these weaknesses to gain additional unauthorized access. For complete technical details, refer to the Intel Security Advisory INTEL-SA-00766.

Detection Methods for CVE-2022-46329

Indicators of Compromise

• Unusual privilege escalation attempts or successful escalations involving Intel wireless driver processes
• Unexpected modifications to Intel wireless software components or UEFI firmware
• Suspicious activity in system logs related to iwlwifi kernel module or Intel wireless management services
• Anomalous behavior from processes running with elevated privileges accessing wireless driver components

Detection Strategies

• Monitor system calls and API interactions with Intel wireless drivers for unauthorized privilege escalation attempts
• Implement file integrity monitoring on Intel wireless software binaries and configuration files
• Deploy endpoint detection and response (EDR) solutions capable of detecting exploitation of driver-level vulnerabilities
• Enable kernel auditing to track interactions with wireless driver modules and UEFI components

Monitoring Recommendations

• Configure SIEM rules to alert on unusual privilege escalation patterns involving wireless network components
• Monitor for unauthorized modifications to Intel wireless driver files and related system components
• Implement behavioral analysis to detect anomalous interactions between user-mode processes and kernel-mode wireless drivers
• Track firmware update attempts and UEFI modifications outside of scheduled maintenance windows

How to Mitigate CVE-2022-46329

Immediate Actions Required

• Update Intel PROSet/Wireless WiFi software to the latest patched version as specified in Intel Security Advisory INTEL-SA-00766
• Apply operating system updates from Fedora and Debian that include patched wireless firmware packages
• Review and audit systems for signs of prior exploitation or unauthorized privilege escalation
• Implement the principle of least privilege to minimize the number of users with elevated access to affected systems

Patch Information

Intel has released security updates to address this vulnerability. Organizations should obtain the latest firmware and driver updates from the Intel Security Advisory INTEL-SA-00766. Linux distributions have also released updated packages:

• Debian LTS Security Announcement provides updates for Debian 10.0
• Fedora has released package updates for versions 37, 38, and 39 through their package announcement lists

Workarounds

• Restrict local access to affected systems to only essential personnel with verified need
• Implement network segmentation to limit lateral movement if a system is compromised
• Enable additional logging and monitoring on systems with Intel wireless hardware until patches can be applied
• Consider disabling Intel wireless functionality on critical systems where wired connectivity is available as a temporary measure

# Check current Intel wireless firmware version on Linux
modinfo iwlwifi | grep -E "version|firmware"

# Update firmware packages on Debian-based systems
sudo apt update && sudo apt upgrade firmware-iwlwifi

# Update firmware packages on Fedora systems
sudo dnf update linux-firmware