Gentoo: gtkdiskfree Insecure temporary file creation
Posted by Benjamin D. Thomas   
Gentoo gtkdiskfree is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
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Gentoo Linux Security Advisory                           GLSA 200510-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: gtkdiskfree: Insecure temporary file creation
      Date: October 03, 2005
      Bugs: #104565
        ID: 200510-01

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Synopsis
========

gtkdiskfree is vulnerable to symlink attacks, potentially allowing a
local user to overwrite arbitrary files.

Background
==========

gtkdiskfree is a GTK-based GUI to show free disk space.

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

    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  app-admin/gtkdiskfree     < 1.9.3-r1                  >= 1.9.3-r1

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

Eric Romang discovered that gtkdiskfree insecurely creates a
predictable temporary file to handle command output.

Impact
======

A local attacker could create a symbolic link in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
gtkdiskfree is executed, this would result in the file being
overwritten with the rights of the user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All gtkdiskfree users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-admin/gtkdiskfree-1.9.3-r1"

References
==========

  [ 1 ] CAN-2005-2918
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2918
  [ 2 ] Original Advisory
        http://www.zataz.net/adviso/gtkdiskfree-09052005.txt

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

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

  http://security.gentoo.org/glsa/glsa-200510-01.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 2005 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