CVE-2021-27429 : Exploit Details and Defense Strategies

Texas Instruments TI-RTOS exposes an integer overflow vulnerability due to returning a valid pointer to a small buffer on extremely large values.

Understanding CVE-2021-27429

This vulnerability in TI-RTOS can lead to code execution by triggering an integer overflow in 'HeapTrack_alloc'.

What is CVE-2021-27429?

Texas Instruments TI-RTOS returns a valid pointer to a small buffer on extremely large values. This can trigger an integer overflow vulnerability in 'HeapTrack_alloc' and result in code execution.

The Impact of CVE-2021-27429

With a CVSS base score of 7.4 (High), this vulnerability has a significant impact on confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-27429

Vulnerability Description

The vulnerability arises from a flaw in the TI-RTOS functionality, allowing an attacker to exploit integer overflow.

Affected Systems and Versions

CC32XX versions less than 4.40.00.07
SimpleLink MSP432E4XX (all versions)
SimpleLink-CC13XX versions that are all affected
SimpleLink-CC26XX and SimpleLink-CC32XX versions less than 4.40.00

Exploitation Mechanism

The vulnerability can be exploited through crafting malicious inputs to trigger the integer overflow and potentially execute arbitrary code.

Mitigation and Prevention

Immediate Steps to Take

Update Texas Instruments CC32XX to v4.40.00.07
Update Texas Instruments SimpleLink CC13X0 to v4.10.03
Update Texas Instruments SimpleLink CC13X2-CC26X2 to v4.40.00
Update Texas Instruments SimpleLink CC2640R2 to v4.40.00
For Texas Instruments SimpleLink MSP432E4, no update is currently planned

Long-Term Security Practices

Ensure regular security updates and patches for all affected systems. Implement secure coding practices and conduct regular security audits.

Patching and Updates

Refer to vendor recommendations for security patches and updates to mitigate the risk associated with this vulnerability.