In the add_match function in libbb/lineedit.c in BusyBox through 1.27.2, the tab autocomplete feature of the shell, used to get a list of filenames in a directory, does not sanitize filenames and results in executing any escape sequence in the terminal. This could potentially result in code execution, arbitrary file writes, or other attacks when combined with the usage of vulnerable / buggy terminal emulators.

Upstream patch:

https://git.busybox.net/busybox/commit/?id=c3797d40a1c57352192c6106cc0f435e7d9c11e8

External References:

https://www.twistlock.com/2017/11/20/cve-2017-16544-busybox-autocompletion-vulnerability/