CVE-2021-44479 : Exploit Details and Defense Strategies

NXP Kinetis K82 devices are affected by a buffer over-read vulnerability during USB In-System Programming (ISP) mode, leading to the disclosure of protected flash memory.

Understanding CVE-2021-44479

This CVE involves a specific vulnerability impacting NXP Kinetis K82 devices, potentially exposing sensitive information.

What is CVE-2021-44479?

The vulnerability allows an attacker to trigger a buffer over-read by manipulating a wlength value in a GET Status-Other request, ultimately revealing protected flash memory contents.

The Impact of CVE-2021-44479

The attack has a base severity of MEDIUM with HIGH confidentiality impact, providing unauthorized access to critical information stored in flash memory.

Technical Details of CVE-2021-44479

This section details the technical aspects of the vulnerability.

Vulnerability Description

The buffer over-read occurs in NXP Kinetis K82 devices when a crafted wlength value is used in a specific USB operation, leading to data exposure.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: N/A

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: Low
Scope: Unchanged
User Interaction: None

Mitigation and Prevention

Protective measures and actions to prevent exploitation of CVE-2021-44479.

Immediate Steps to Take

Monitor for any unusual USB activity on affected devices.
Implement USB access controls to limit unauthorized interactions.
Apply patches or updates provided by NXP to address the vulnerability.

Long-Term Security Practices

Conduct regular security assessments and penetration testing on embedded systems.
Educate users about safe USB practices to mitigate potential risks.

Patching and Updates

Stay informed about security bulletins and updates from NXP regarding CVE-2021-44479.