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[ GLSA 200504-25 ] Rootkit Hunter: Insecure temporary file creation

From: Sune Kloppenborg Jeppesen (jaervoszgentoo.org)
Date: Tue Apr 26 2005 - 14:14:32 CDT


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Gentoo Linux Security Advisory GLSA 200504-25
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Rootkit Hunter: Insecure temporary file creation
      Date: April 26, 2005
      Bugs: #90007
        ID: 200504-25

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Synopsis
========

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

Background
==========

Rootkit Hunter is a scanning tool to detect rootkits, backdoors and
local exploits on a local machine. Rootkit Hunter uses downloaded data
files to check file integrity. These files are updated via the
check_update.sh script.

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

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 app-forensics/rkhunter < 1.2.3-r1 >= 1.2.3-r1

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

Sune Kloppenborg Jeppesen and Tavis Ormandy of the Gentoo Linux
Security Team have reported that the check_update.sh script and the
main rkhunter script insecurely creates several temporary files with
predictable filenames.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
rkhunter or the check_update.sh script runs, 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 Rootkit Hunter users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-forensics/rkhunter-1.2.3-r1"

References
==========

  [ 1 ] CAN-2005-1270
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1270

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

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

  http://security.gentoo.org/glsa/glsa-200504-25.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
securitygentoo.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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