majordomo is not safe to run on multi-user machines

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===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
                 ESB-2000.162 -- FreeBSD-SA-00:28.majordomo
             majordomo is not safe to run on multi-user machines
                                 7 July 2000

===========================================================================

	AusCERT Security Bulletin Summary
	---------------------------------

Product:		majordomo
Vendor:			FreeBSD Ports Collection
Operating System:	FreeBSD
			Linux
			Unix
Platform:		N/A

Impact:			Execute Arbitrary Code/Commands
			Modify Arbitrary files

Access Required:	Local, Existing User

Ref:			ESB-2000.118

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FreeBSD-SA-00:28                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:          majordomo is not safe to run on multi-user machines

Category:       ports
Module:         majordomo
Announced:      2000-07-05
Affects:        Ports collection.
Corrected:      See below
Vendor status:  Problem documented
FreeBSD only:   NO

I.   Background

Majordomo is a popular mailing-list manager.

II.  Problem Description

Majordomo contains a number of perl scripts which are executed by a
setuid wrapper for providing mailing-list management
functionality. However there are numerous weaknesses in these scripts
which allow unprivileged users to run arbitrary commands as the
majordomo user, as well as obtaining read and write access to the
mailing list data.

The majordomo port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 3400 third-party applications in a ready-to-install
format.

FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.

III. Impact

Unprivileged local users can run commands as the 'majordomo' user,
including accessing and modifying mailing-list subscription data.

If you have not chosen to install the majordomo port/package, then
your system is not vulnerable to this problem.

IV.  Workaround

Deinstall the majordomo port/package, if you you have installed it, or
limit the permissions of the majordomo/ directory and/or its contents
appropriately (see below).

V.   Solution

Since the vendor has chosen not to fix the various security holes in
the default installation of majordomo, there is no simple solution. It
may be possible to adequately secure the majordomo installation while
retaining required functionality, by tightening the permissions on the
/usr/local/majordomo directory and/or its contents, but these actions
are not taken by the FreeBSD port and are beyond the scope of this
advisory.

Instead we recommend that majordomo not be used on a system which
contains untrusted users, or an alternative mailing-list manager be
used. There are several such utilities in the FreeBSD ports
collection.

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