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Date: Tue, 19 Jun 2018 09:59:53 +0200
From: Matthias Gerstner <mgerstner@...e.de>
To: oss-security@...ts.openwall.com
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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