CVE-2021-26706 Explained : Impact and Mitigation

An issue was discovered in lib_mem.c in Micrium uC/OS uC/LIB 1.38.x and 1.39.00. The vulnerability arises due to certain memory allocation functions that do not check for integer overflow, potentially leading to a smaller memory pool than expected which could be exploited by an attacker.

Understanding CVE-2021-26706

This section provides insights into the nature of the CVE-2021-26706 vulnerability.

What is CVE-2021-26706?

CVE-2021-26706 is a vulnerability found in Micrium uC/OS uC/LIB versions 1.38.x and 1.39.00, where memory allocation functions fail to check for integer overflow, resulting in a smaller than expected memory pool.

The Impact of CVE-2021-26706

The vulnerability may be exploited by an attacker due to the inadequate memory allocation, potentially leading to security breaches and unauthorized access.

Technical Details of CVE-2021-26706

This section delves into the technical aspects of CVE-2021-26706.

Vulnerability Description

The vulnerability in lib_mem.c allows for integer overflow during memory pool allocation, creating a smaller pool than intended, leaving it susceptible to exploitation.

Affected Systems and Versions

Micrium uC/OS uC/LIB versions 1.38.x and 1.39.00 are affected by this vulnerability, potentially impacting systems utilizing these versions.

Exploitation Mechanism

The vulnerability arises from memory allocation functions like Mem_PoolCreate, Mem_DynPoolCreate, and Mem_DynPoolCreateHW not properly checking for integer overflow, leading to a smaller memory pool that could be leveraged by malicious actors.

Mitigation and Prevention

This section outlines steps to mitigate and prevent exploitation of CVE-2021-26706.

Immediate Steps to Take

Users are advised to update to a patched version, apply security updates, and monitor for any suspicious activities indicating exploitation of the vulnerability.

Long-Term Security Practices

Implement secure coding practices, conduct regular security assessments, and stay informed about the latest vulnerabilities and patches to enhance overall system security.

Patching and Updates

It is essential to regularly check for security updates from the software provider, apply patches promptly, and follow best practices for secure software development.