[Buildroot] [PATCH] screen: bump to version 4.2.1

[Baruch Siach]

Hi Maarten,

On Mon, Sep 15, 2014 at 01:54:05PM +0200, Maarten ter Huurne wrote:
> The Buildroot package of GNU Screen installs the binary as setuid root; both 
> the old (4.0.3) and the new (4.2.1) version do. After having spent some time 
> reading the Screen source code, I wouldn't trust it with root privileges on 
> any system where security is relevant.
> 
> I haven't seen (or looked for) any actual code that could be exploited, just 
> a code base that is really old, under-maintained and quite complex from all 
> the workarounds it contains. So it resembles the OpenSSL situation, although 
> it is not quite that bad.
> 
> It seems multiuser mode is the feature that requires Screen to be setuid 
> root. Which means that without setuid root, Screen works fine but users can 
> only connect to their own sessions.

Thanks for looking into this.

> I would like some guidance on how to proceed here:
> - leave the setuid flag on
> - always clear the setuid flag post-install
> - make it a configuration option

I vote for this option, defaulting to the current status (i.e. setuid on).

> - ...?

baruch

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