full-disclosure - [ GLSA 200409-18 ] cdrtools: Local root vulnerability in cdrecord if set SUID root

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From: jaervosz at gentoo.org (Sune Kloppenborg Jeppesen)
Subject: [ GLSA 200409-18 ] cdrtools: Local root vulnerability in cdrecord if set SUID root

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Gentoo Linux Security Advisory                           GLSA 200409-18
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                                            http://security.gentoo.org/
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  Severity: High
     Title: cdrtools: Local root vulnerability in cdrecord if set SUID
            root
      Date: September 14, 2004
      Bugs: #63187
        ID: 200409-18

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Synopsis
========

cdrecord, if manually set SUID root, is vulnerable to a local root
exploit allowing users to escalate privileges.

Background
==========

The cdrtools package is a set of tools for CD recording, including the
popular cdrecord command-line utility.

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

    -------------------------------------------------------------------
     Package           /     Vulnerable     /               Unaffected
    -------------------------------------------------------------------
  1  app-cdr/cdrtools      <= 2.01_alpha37          >= 2.01_alpha37-r1
                                                   *>= 2.01_alpha28-r2

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

Max Vozeler discovered that the cdrecord utility, when set to SUID
root, fails to drop root privileges before executing a user-supplied
RSH program. By default, Gentoo does not ship the cdrecord utility as
SUID root and therefore is not vulnerable. However, many users (and
CD-burning front-ends) set this manually after installation.

Impact
======

A local attacker could specify a malicious program using the $RSH
environment variable and have it executed by the SUID cdrecord,
resulting in root privileges escalation.

Workaround
==========

As a workaround, you could remove the SUID rights from your cdrecord
utility :

    # chmod a-s /usr/bin/cdrecord

Resolution
==========

All cdrtools users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=app-cdr/cdrtools-2.01_alpha37-r1"
    # emerge ">=app-cdr/cdrtools-2.01_alpha37-r1"

References
==========

  [ 1 ] CAN-2004-0806
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0806

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

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

  http://security.gentoo.org/glsa/glsa-200409-18.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/1.0
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