Executive Summary

CVE-2025-55089 is a critical buffer overflow vulnerability in the FileX RAM disk driver component of Eclipse ThreadX FileX before version 6.4.2. The issue occurs because the driver does not properly validate that the total sectors multiplied by sector size fits within the allocated RAM disk memory buffer. When processing certain network requests, such as a PUT request via the NetXDuo HTTP server, the driver copies data to a calculated memory location without bounds checking, which can overflow the buffer and overwrite adjacent memory. This can lead to remote code execution without requiring privileges or user interaction. [1]

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can allow an attacker to remotely execute arbitrary code on a system running a vulnerable version of FileX with the RAM disk driver configured unsafely. Because the attack requires no privileges or user interaction and can be performed over the network, it poses a critical risk to system confidentiality, integrity, and availability. Exploitation can cause crashes or allow full system compromise. [1]

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by monitoring for crashes or segmentation faults (e.g., SIGSEGV at address 0x41414141) in systems running vulnerable versions of FileX before 6.4.2, especially when using the RAM disk driver. Detection can also involve analyzing network traffic for suspicious PUT requests to the NetXDuo HTTP server that might trigger the buffer overflow. Specific commands are not provided in the resources, but monitoring system logs for crashes and using network packet capture tools (e.g., tcpdump or Wireshark) to inspect PUT requests targeting the RAM disk driver could help identify exploitation attempts. [1]

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include upgrading FileX to version 6.4.2 or later, where the vulnerability is patched. Additionally, ensure that the product configuration enforces the condition that (total sectors * sector size) is less than the size of the RAM disk memory buffer during fx_media_format initialization to prevent buffer overflows. Avoid using unsafe sample configurations that initialize the RAM disk driver with incorrect parameters. [1]

Useful 0 Not Useful 0