Gentoo: KDE dcopidlng Insecure temporary file creation
Posted by Benjamin D. Thomas   
Gentoo The dcopidlng script is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
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Gentoo Linux Security Advisory                           GLSA 200503-14
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: KDE dcopidlng: Insecure temporary file creation
      Date: March 07, 2005
      Bugs: #81652
        ID: 200503-14

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Synopsis
========

The dcopidlng script is vulnerable to symlink attacks, potentially
allowing a local user to overwrite arbitrary files.

Background
==========

KDE is a feature-rich graphical desktop environment for Linux and
Unix-like Operating Systems. DCOP is KDE's simple IPC/RPC mechanism.
dcopidlng is a DCOP helper script.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  kde-base/kdelibs     < 3.3.2-r5                       >= 3.3.2-r5
                                                          *>= 3.2.3-r7

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

Davide Madrisan has discovered that the dcopidlng script creates
temporary files in a world-writable directory with predictable names.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
dcopidlng 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 kdelibs users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose kde-base/kdelibs

References
==========

  [ 1 ] CAN-2005-0365
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0365

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

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

  http://security.gentoo.org/glsa/glsa-200503-14.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