Re: [Full-disclosure] Samba Remote Zero-Day Exploit

From: Thierry Zoller <>
Subject: Re: [Full-disclosure] Samba Remote Zero-Day Exploit

Hi Paul,

Facts :
- Several distributions run with vulnerable settings per default
  if there is a "misconfiguration" it is part of the vendor.
- Your not supposed to be able to traverse dirs.

Consequence it is a vulnerability, whether you can mitigate it is
a different piece of cake.

Next time somebody creates an IE8 0day that relies on javascript,
will  you  scream  "misconfiguration!"  ?  Of course you could disable
javascript  but  is  it  by enabled default ? Yes.

The question for smb is who does restrict this setting?
My tests reveal - not many.

Congrats  Kingcope,  nice  bug. Directory traversal in major daemon in


pssea> Dear Kingcope,

pssea> The samba server follows symlinks by default. There are options
pssea> ("follow symlinks", "wide links") for turning it off:


pssea> The "problem" at your installation seems a mis-configuration of
pssea> your server: please ask the admin to set "secure" options.
pssea> (Some samba installations, like mine, wish to allow same access as a
pssea> UNIX login would allow. Some shares like [home] are provided for ease
pssea> of use, users are encouraged to create symlinks to other "interesting"
pssea> places e.g. NFS-mounted directories.)

pssea> Cheers, Paul

pssea> Paul Szabo  
pssea> School of Mathematics and Statistics   University of Sydney    Australia

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Thierry Zoller

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