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Hi Daniel,

Am Do den 23. Jun 2016 um  5:00 schrieb Daniel Kahn Gillmor:
> > And no further upgrade is possible anymore.
> 
> That does indeed bad, but i'm unable to replicate it.  Can you help me
> better understand how you ran into this?

Sure.

> > Simply adding "-s /bin/sh" here fixes the problem.
> 
> I'm surprised to hear this.  The monkeysphere user is normally manually
> configured to use /bin/bash.

Well, I have a hardened system with system users without a shell.

That isn't a problem for monkeysphere too until now.

> I also note on your system that /bin/sh is linked to /bin/dash, and
> monkeysphere scripts are not compatible with dash, for whatever that's
> worth.

That's also intended. And frankly that saved my ass some time ago when
this bash bug came out.

> Can you show me the output of:
> 
>    getent passwd monkeysphere

   monkeysphere:x:124:135:monkeysphere authentication 
user,,,:/var/lib/monkeysphere:/bin/false

> > Note that this bug is maybe related to #778833 and #635711.

About #778833, I do not understand it. What is about the court notice???

> I don't think these are the same. Those bugs were related to issues
> around pipeline failures (premature closing of the tail of a pipeline),
> and would not have been solved by adding "-s /bin/sh".

Yes, I also don't think they are the same.

About /bin/sh or /bin/bash.. I think it doesn't matter in su call as the
script itself pulls /bin/bash afterwards via she bang line. It is just
the smallest possibility and when it comes to security, it is always
about using not more than needed.

Regards
   Klaus
- -- 
Klaus Ethgen                              http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16   Klaus Ethgen <kl...@ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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