CVE-2021-27433 : Security Advisory and Response

ARM mbed-ualloc memory library version 1.3.0 is vulnerable to an integer overflow or wraparound issue in the function mbed_krbs. This vulnerability can be exploited to trigger arbitrary memory allocation, leading to unexpected behaviors like crashes or remote code injection/execution.

Understanding CVE-2021-27433

This CVE involves a vulnerability in the ARM mbed-ualloc memory library version 1.3.0 that can have serious consequences.

What is CVE-2021-27433?

CVE-2021-27433 pertains to an integer overflow or wraparound vulnerability in the mbed-ualloc memory library, allowing attackers to perform remote code execution.

The Impact of CVE-2021-27433

The impact of this CVE is significant as it can lead to arbitrary memory allocation, which in turn enables crashes or unauthorized code execution.

Technical Details of CVE-2021-27433

Here are the technical aspects of the CVE to help you understand the vulnerability better.

Vulnerability Description

The vulnerability arises from an integer wrap-around issue in the mbed_krbs function, facilitating unauthorized memory allocation.

Affected Systems and Versions

ARM mbed-ualloc memory library version 1.3.0 is specifically affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability to trigger arbitrary memory allocation, potentially causing system crashes or injecting and executing malicious code.

Mitigation and Prevention

To safeguard your systems and data, follow these mitigation strategies.

Immediate Steps to Take

It is crucial to apply the available security updates to fix this vulnerability promptly.

Long-Term Security Practices

Implement secure coding practices and conduct regular security assessments to catch vulnerabilities early.

Patching and Updates

ARM has released an update for Mbed OS to address this vulnerability.