full-disclosure - IMAP4rev1 2000.283 allows access to system files

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Message-ID: <20020810173131.GB1040@rshell.org>
From: fd at rshell.org (Guy Cohen)
Subject: IMAP4rev1 2000.283 allows access to system files

Hi,

This just might be misconfiguration on the one imap server I have access
too, but It might not.

when trying to check what's up with my mail using telnet, I've
issued a command: LIST "*" "*" and to my suprise got a listing of the files
in my directory. I could run LIST "../*" "*" and get the listing of directories
above mine. and so forth. Well then i tought to my self how far can this go,
so i tried SELECT "/etc/hosts"; FETCH 1 (flags rfc822.text) and guess what
I saw... then I went on to CREATE "/tmp/MyTest". Writing into other
files is a little tricky but can be done with append after using select to
find out if the file is writable.

Cheers,
  Guy

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