CVE-2022-24415: Dell Alienware 13 R3 Firmware RCE Flaw

CVE-2022-24415 Overview

Dell BIOS contains an improper input validation vulnerability that allows a local authenticated malicious user to potentially exploit the flaw by using a System Management Interrupt (SMI) to gain arbitrary code execution during System Management Mode (SMM). This BIOS/UEFI vulnerability affects a wide range of Dell products including Alienware gaming systems, Inspiron laptops, Vostro desktops, Edge Gateway devices, and enterprise thin clients.

SMM is a highly privileged CPU operating mode used for system-wide functions like power management and hardware control. Code running in SMM has unrestricted access to all system memory and hardware, making SMM vulnerabilities particularly dangerous as they can bypass operating system security mechanisms and enable persistent rootkits.

Critical Impact

A local authenticated attacker can achieve arbitrary code execution in SMM, potentially enabling persistent firmware-level malware, bypassing Secure Boot, and compromising system integrity below the operating system level.

Affected Products

• Dell Alienware Series (13 R3, 15 R3/R4, 17 R4/R5, Area 51m R1/R2, Aurora R8, M15 R2/R3/R4, M17 R2/R3/R4, X15 R1, X17 R1)
• Dell Inspiron Series (3277, 3465, 3477, 3482, 3502, 3510, 3565, 3573, 3582, 3782, 14 3473, 15 3573, 15 5566)
• Dell Vostro Series (3267, 3268, 3572, 3582, 3660, 3667, 3668, 3669, 14 5468, 15 5568)
• Dell Edge Gateway (3000, 5000, 5100), Embedded Box PC (3000, 5000), Latitude 3379, Wyse 7040 Thin Client, XPS 8930

Discovery Timeline

• March 11, 2022 - CVE-2022-24415 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-24415

Vulnerability Analysis

This vulnerability exists within the BIOS firmware of affected Dell systems due to improper validation of input parameters passed to SMI handlers. System Management Mode is a special-purpose operating mode in x86 processors that provides a separate execution environment designed for low-level system functions. SMI handlers are routines that execute when the processor enters SMM in response to a System Management Interrupt.

The improper input validation flaw (CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer) allows an authenticated local attacker to craft malicious input that, when processed by a vulnerable SMI handler, leads to arbitrary code execution within the highly privileged SMM context. Since SMM operates with Ring -2 privileges (more privileged than the kernel at Ring 0), successful exploitation grants the attacker capabilities that surpass those of the operating system.

Root Cause

The root cause is insufficient bounds checking and validation of user-controllable input within SMI handler code in the Dell BIOS. When SMI handlers receive parameters from less privileged code (such as kernel drivers or applications), they must rigorously validate these inputs before processing them. The vulnerable handlers fail to properly sanitize input buffers, allowing attackers to trigger memory corruption conditions that lead to code execution.

Attack Vector

The attack requires local access to the system with authenticated user privileges. An attacker must be able to trigger SMIs with crafted input parameters, typically accomplished through:

1. Loading a malicious kernel driver or using existing legitimate drivers that communicate with BIOS SMI handlers
2. Crafting malicious input buffers that exploit the improper validation
3. Triggering the SMI to execute the vulnerable handler with the malicious input
4. Achieving code execution within SMM context

Once code execution is achieved in SMM, an attacker can:

• Disable Secure Boot protections
• Modify firmware code and settings
• Install persistent rootkits that survive OS reinstallation
• Access protected memory regions including secrets and credentials

The vulnerability requires local access and authentication, limiting the attack surface but making it particularly dangerous for insider threats or as a post-exploitation persistence mechanism.

Detection Methods for CVE-2022-24415

Indicators of Compromise

• Unexpected BIOS firmware modifications or checksum mismatches when compared to known-good firmware images
• Anomalous SMI activity patterns that may indicate exploitation attempts
• Unauthorized kernel driver installations, particularly those interacting with BIOS/SMI interfaces
• Evidence of attempts to disable Secure Boot or modify firmware settings outside normal administrative activity

Detection Strategies

• Implement firmware integrity monitoring solutions that can detect unauthorized BIOS modifications
• Monitor for suspicious kernel driver loading events, especially drivers that interact with low-level system interfaces
• Deploy endpoint detection and response (EDR) solutions capable of detecting pre-boot and firmware-level threats
• Utilize hardware-based root of trust technologies such as Intel Boot Guard where available

Monitoring Recommendations

• Enable BIOS event logging and regularly audit firmware configuration changes
• Configure SentinelOne agents to monitor for suspicious system-level activities that may precede firmware attacks
• Implement application control policies to prevent unauthorized kernel driver installations
• Establish baseline firmware versions across the enterprise and alert on deviations

How to Mitigate CVE-2022-24415

Immediate Actions Required

• Inventory all affected Dell systems in your environment using the product list in Dell Security Advisory DSA-2022-053
• Prioritize BIOS updates for systems in sensitive environments or those accessible to untrusted users
• Restrict local administrative access to affected systems to trusted personnel only
• Enable Secure Boot and BIOS password protection to increase the difficulty of firmware-level attacks

Patch Information

Dell has released updated BIOS firmware to address this vulnerability. Administrators should download and apply the latest BIOS updates from Dell's official support website for each affected product model. The complete list of affected products and their corresponding fixed BIOS versions is available in Dell Security Advisory DSA-2022-053.

BIOS updates should be tested in a non-production environment before widespread deployment. Organizations with large fleets of affected systems should consider using Dell's enterprise deployment tools for coordinated updates.

Workarounds

• Implement strict access controls limiting local authenticated access to affected systems
• Enable BIOS administrator passwords to prevent unauthorized firmware configuration changes
• Deploy endpoint protection solutions with firmware attack detection capabilities
• Consider network segmentation to isolate systems that cannot be immediately patched

# Dell BIOS update verification (Windows PowerShell)
# Check current BIOS version on Dell systems
Get-WmiObject -Class Win32_BIOS | Select-Object SMBIOSBIOSVersion, ReleaseDate, SerialNumber

# Compare against Dell's advisory for patched versions
# Visit: https://www.dell.com/support/kbdoc/en-us/000197057/dsa-2022-053