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Date: Tue, 19 Jun 2018 09:59:53 +0200
From: Matthias Gerstner <>
Subject: Re: cantata: cantata-mounter D-Bus service local
 privilege escalation and other security issues

> A) The mount target path check in mounter.cpp `mpOk()` is insufficient.
>   A regular user can this way mount a CIFS filesystem anywhere, and not
>   just beneath /home by passing relative path components.

This was assigned CVE-2018-12559.

> B) Arbitrary unmounts can be performed by regular users the same way.

This was assigned CVE-2018-12560.

> C) A regular user can inject additional mount options like file_mode= by
>   manipulating e.g. the domain parameter of the samba URL.

This was assigned CVE-2018-12561.

> D) The wrapper script 'mount.cifs.wrapper' uses the shell to forward the
>   arguments to the actual mount.cifs binary. The shell evaluates
>   wildcards which can also be injected like this:

This was assigned CVE-2018-12562.

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