full-disclosure - [ GLSA 200411-17 ] mtink: Insecure tempfile handling

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From: jaervosz at gentoo.org (Sune Kloppenborg Jeppesen)
Subject: [ GLSA 200411-17 ] mtink: Insecure tempfile handling

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Gentoo Linux Security Advisory                           GLSA 200411-17
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: mtink: Insecure tempfile handling
      Date: November 09, 2004
      Bugs: #70310
        ID: 200411-17

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Synopsis
========

mtink is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files with the rights of the user running
the utility.

Background
==========

mtink is a status monitor and inkjet cartridge changer for some Epson
printers.

Affected packages
=================

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-print/mtink       < 1.0.5                            >= 1.0.5

Description
===========

Tavis Ormandy from Gentoo Linux discovered that mtink uses insecure
permissions on temporary files.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
mtink is executed, this would result in the file being overwritten with
the rights of the user running the utility, which could be the root
user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All mtink users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-print/mtink-1.0.5"

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200411-17.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0
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