Overview
A stack-based overflow vulnerability exists in the tinydhcp server in the Microchip Advanced Software Framework (ASF) that can lead to remote code execution.
Description
An implementation of DHCP in ASF fails input validation, thereby creating conditions for a stack-based overflow. The software is no longer supported by the vendor. Because this vulnerability is in IoT-centric code, it is likely to surface in many places in the wild.
CVE-2024-7490
There exists a vulnerability in all publicly available examples of the ASF codebase that allows for a specially crafted DHCP request to cause a stack-based overflow that could lead to remote code execution.
Impact
This vulnerability can be tested by sending a single DHCP Request packet to a multicast address. This vulnerability exists in the current version of ASF 3.52.0.2574 and all previous versions of the software. There are also multiple forks of the tinydhcp software in github that are also potentially susceptible to this vulnerability.
Solution
The CERT/CC is currently unaware of a practical solution to this problem other than replacing the tinydhcp service with another one that does not have the same issue.
Acknowledgements
Thanks to the reporter Andrue Coombes of Amazon Element55. This document was written by Timur Snoke.
Vendor Information
One or more vendors are listed for this advisory. Please reference the full report for more information.
References
https://asf.microchip.com/docs/latest/
https://savannah.nongnu.org/projects/lwip/
138043 stack based overflow vulnerability exists microchip advanced software framework implementation tinydhcp server
