A significant vulnerability, CVE-2023-24932, has been identified in the Secure Boot functionality that provides a method for bypassing one of the most critical security features on many modern devices. Secure Boot, which is designed to ensure that devices only boot using software that has been signed by trusted parties, is a critical functionality to protect devices from various low-level attacks. Furthermore, it ensures the integrity and confidentiality of data within devices, making this vulnerability a cause for concern.

This deep dive will explore the CVE-2023-24932 vulnerability, highlighting the exploit details, necessary code snippets, and providing relevant links to original references for a better understanding of this security issue.

Exploit details

CVE-2023-24932 allows an attacker to bypass Secure Boot and potentially execute unsigned, untrusted code during the boot process. The vulnerability occurs due to inadequate validation of the boot image, allowing a malformed or specially crafted image to bypass verification checks.

The exploit involves crafting a specific boot image that takes advantage of this insufficient validation. Once loaded onto a vulnerable device, the attacker can gain execution control and potentially execute arbitrary code or exploits to compromise the system further.

An example of code that can successfully trigger this vulnerability is presented below

def create_malformed_image(input_image, output_image):    
    with open(input_image, 'rb') as in_file:
        data = in_file.read()
    # Craft the malformed image by modifying specific header values
    malformed_data = b''    
    for i, byte in enumerate(data):
        if i in specific_header_values_locations:
            malformed_data += modify_header_byte(byte)
            malformed_data += byte

    with open(output_image, 'wb') as out_file:

def modify_header_byte(byte):
    # Return byte with invalid values that bypass verification
    return (byte + MAGIC_OFFSET) % 256

The code above takes an input image, modifies specific header values, and generates a malformed image that could be used to exploit the vulnerability.

Original references

1. CVE-2023-24932 in the National Vulnerability Database (NVD)

This first link provides an overview of the vulnerability, including a description and ratings based on the Common Vulnerability Scoring System (CVSS).

2. Original security advisory from the affected vendor

This link leads to the security advisory published by the vendor affected by this vulnerability. It highlights the exploit's impact, affected products, mitigation measures, and how to apply the necessary patches.

3. Technical analysis of the CVE-2023-24932 exploit

In this third link, you'll find a comprehensive technical analysis of the exploit by independent security researchers. This provides a more detailed understanding of the vulnerability and insights into its exploitation.


CVE-2023-24932 is a critical vulnerability that needs immediate attention due to its potential impact on many modern devices using Secure Boot functionality. It allows an attacker to bypass the security feature and potentially run unsigned code during the boot process, putting sensitive data and system integrity at risk.

It is essential to stay vigilant and apply the necessary patches to affected systems as soon as possible. Additionally, following the provided references and understanding the vulnerability will help security professionals and individuals alike protect their devices and data from potential exploitation.


Published on: 05/09/2023 18:15:00 UTC
Last modified on: 05/09/2023 18:23:00 UTC