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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
2010.
Regards,
Thierry
pssea> Dear Kingcope,
pssea> The samba server follows symlinks by default. There are options
pssea> ("follow symlinks", "wide links") for turning it off:
pssea> link://[click]
pssea> link://[click]
pssea> link://[click]
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 psz@xxxxxxxxxxxxxxxxx
pssea> link://[click]
pssea> School of Mathematics and Statistics University of Sydney Australia
pssea>
pssea> Full-Disclosure - We believe in it.
pssea> Charter: link://[click]
pssea> Hosted and sponsored by Secunia - link://[click]
--
link://[click]
Thierry Zoller
Full-Disclosure - We believe in it.
Charter: link://[click]
Hosted and sponsored by Secunia - link://[click]
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