CVE-2021-27502 : Vulnerability Insights and Analysis

Texas Instruments TI-RTOS, when configured to use HeapMem heap(default), malloc returns a valid pointer to a small buffer on extremely large values, which can trigger an integer overflow vulnerability in 'HeapMem_allocUnprotected' and result in code execution.

Understanding CVE-2021-27502

This CVE affects Texas Instruments products with specific versions, potentially leading to an integer overflow vulnerability and code execution.

What is CVE-2021-27502?

CVE-2021-27502 is a vulnerability in Texas Instruments TI-RTOS that allows for an integer overflow issue when using HeapMem heap configuration, leading to potential code execution.

The Impact of CVE-2021-27502

The impact of this vulnerability is considered high, with a CVSS base score of 7.4 (High), affecting confidentiality, integrity, and availability of the system.

Technical Details of CVE-2021-27502

This section covers the specific details regarding the vulnerability, affected systems, and how exploitation can occur.

Vulnerability Description

The vulnerability arises from the way malloc returns pointers in Texas Instruments TI-RTOS, potentially leading to an integer overflow in 'HeapMem_allocUnprotected'.

Affected Systems and Versions

Texas Instruments CC32XX (Versions less than 4.40.00.07)
SimpleLink MSP432E4XX (All Versions)
SimpleLink-CC13XX (With versions less than 4.40.00)
SimpleLink-CC26XX (With versions less than 4.40.00)
SimpleLink-CC32XX (With versions less than 4.10.03)

Exploitation Mechanism

The vulnerability can be exploited by manipulating large values in malloc calls to trigger the integer overflow in 'HeapMem_allocUnprotected', potentially leading to code execution.

Mitigation and Prevention

Protecting systems from CVE-2021-27502 involves immediate actions and long-term security practices to prevent exploitation and minimize risks.

Immediate Steps to Take

Update Texas Instruments CC32XX to version 4.40.00.07.
Update SimpleLink CC13X0 to version 4.10.03.
Update SimpleLink CC13X2-CC26X2 to version 4.40.00.
Update SimpleLink CC2640R2 to version 4.40.00.
SimpleLink MSP432E4 is confirmed with no planned updates.

Long-Term Security Practices

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

Patching and Updates

Regularly check for vendor updates and security advisories to apply patches promptly and ensure system security.