[Secure-testing-team] Bug#882258: busybox: CVE-2017-16544: lineedit: do not tab-complete any strings which have control characters

[Salvatore Bonaccorso]

Source: busybox
Version: 1:1.27.2-1
Severity: grave
Tags: security

Hi,

the following vulnerability was published for busybox. I realize you
know of the issue already but just filling to have a tracking bug as
well in the BTS.

CVE-2017-16544[0]:
| 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.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2017-16544
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16544
[1] https://git.busybox.net/busybox/commit/?id=c3797d40a1c57352192c6106cc0f435e7d9c11e8

Please adjust the affected versions in the BTS as needed, only
unstable checked so far.

Regards,
Salvatore