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

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200409-18
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: High
     Title: cdrtools: Local root vulnerability in cdrecord if set SUID
            root
      Date: September 14, 2004
      Bugs: #63187
        ID: 200409-18

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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 () gentoo 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

Attachment: _bin
Description: