full-disclosure - Re: [FD] Skype Debian package: allows complete machine takeover for Microsoft

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Message-ID: <20180928181825.GA20526@hunt>
Date: Fri, 28 Sep 2018 11:18:25 -0700
From: Seth Arnold <seth.arnold@...onical.com>
To: fulldisclosure@...lists.org
Subject: Re: [FD] Skype Debian package: allows complete machine takeover for
 Microsoft

On Tue, Sep 25, 2018 at 07:04:18PM +0200, Enrico Weigelt, metux IT consult wrote:
> Operator's workaround:
> [..]
>   c) use apt pinning to restrict the Microsoft repo to only the
>      package 'skypeforlinux'

Please note that the Debian package pre/post inst/rm scripts run with
full root privileges without any constraints on what they can do.

If your threat model includes either a disclosure of Microsoft's APT
repository signing key or malicious use of this key by Microsoft then
this workaround does not address these threats.

Thanks

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