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CVE-2019-14657

Description

Yealink phones through 2019-08-04 have an issue with OpenVPN file upload. They execute tar as root to extract files, but do not validate the extraction directory. Creating a tar file with ../../../../ allows replacement of almost any file on a phone. This leads to password replacement and arbitrary code execution as root.

POC

Reference

- https://sway.office.com/3pCb559LYVuT0eig

Github

No PoCs found on GitHub currently.