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Gentoo: Heartbeat Insecure temporary file creation Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo Heartbeat is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
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Gentoo Linux Security Advisory                           GLSA 200508-05
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Heartbeat: Insecure temporary file creation
      Date: August 07, 2005
      Bugs: #97175
        ID: 200508-05

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Synopsis
========

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

Background
==========

Heartbeat is a component of the High-Availability Linux project. It it
used to perform death-of-node detection, communications and cluster
management.

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

    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  sys-cluster/heartbeat     < 1.2.3-r1                  >= 1.2.3-r1

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

Eric Romang has discovered that Heartbeat insecurely creates temporary
files with predictable filenames.

Impact
======

A local attacker could create symbolic links in the temporary file
directory, pointing to a valid file somewhere on the filesystem. When a
vulnerable script is executed, this could lead to the file being
overwritten with the rights of the user running the affected
application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Heartbeat users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-cluster/heartbeat-1.2.3-r1"

References
==========

  [ 1 ] CAN-2005-2231
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2231

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

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

  http://security.gentoo.org/glsa/glsa-200508-05.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
 
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