CVE-2022-39343 : Security Advisory and Response

Azure RTOS FileX is found to be vulnerable to a buffer overflow issue due to integer under and overflows in versions prior to 6.2.0. This vulnerability could be exploited to modify memory contents.

Understanding CVE-2022-39343

This CVE highlights a vulnerability in Azure RTOS FileX that allows for buffer overflow attacks.

What is CVE-2022-39343?

The issue stems from integer under and overflow problems in the Fault Tolerant feature of Azure RTOS FileX, enabling attackers to achieve buffer overflow and manipulate memory content. The vulnerability has been addressed in version 6.2.0.

The Impact of CVE-2022-39343

If exploited, this vulnerability could lead to unauthorized modification of memory content, potentially allowing for unauthorized access or disruption of service.

Technical Details of CVE-2022-39343

This section dives into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from improper handling of log entries of type

FX_FAULT_TOLERANT_DIR_LOG_TYPE

, leading to unexpected behavior when manipulated maliciously.

Affected Systems and Versions

Azure RTOS FileX versions prior to 6.2.0 are vulnerable to this issue.

Exploitation Mechanism

By crafting a specific log with entries of type

FX_FAULT_TOLERANT_DIR_LOG_TYPE

, attackers can introduce unexpected behavior and exploit the buffer overflow.

Mitigation and Prevention

Understanding how to mitigate and prevent the impact of CVE-2022-39343.

Immediate Steps to Take

It is recommended to update Azure RTOS FileX to version 6.2.0 or later to eliminate this vulnerability. Additionally, applying the documented workaround for line 218 in

fx_fault_tolerant_apply_logs.c

can provide temporary relief.

Long-Term Security Practices

To enhance overall security posture, organizations should prioritize regular software updates, security patching, and thorough code review processes.

Patching and Updates

Ensure that all systems running Azure RTOS FileX are updated to the patched version 6.2.0 to mitigate the risk of exploitation.