BugTraq
[ GLSA 200508-19 ] lm_sensors: Insecure temporary file creation Aug 30 2005 02:28PM
Thierry Carrez (koon gentoo org)
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Gentoo Linux Security Advisory GLSA 200508-19
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http://security.gentoo.org/
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Severity: Normal
Title: lm_sensors: Insecure temporary file creation
Date: August 30, 2005
Bugs: #103568
ID: 200508-19

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Synopsis
========

lm_sensors is vulnerable to linking attacks, potentially allowing a
local user to overwrite arbitrary files.

Background
==========

lm_sensors is a software package that provides drivers for monitoring
the temperatures, voltages, and fans of Linux systems with hardware
monitoring devices.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/lm_sensors < 2.9.1-r1 >= 2.9.1-r1

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

Javier Fernandez-Sanguino Pena has discovered that lm_sensors
insecurely creates temporary files with predictable filenames when
saving configurations.

Impact
======

A local attacker could create symbolic links in the temporary file
directory, pointing to a valid file somewhere on the filesystem. When
the pwmconfig script of lm_sensors is executed, this would result in
the file being overwritten with the rights of the user running the
script, which typically is the root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All lm_sensors users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/lm_sensors-2.9.1-r1"

References
==========

[ 1 ] CAN-2005-2672
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2672

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

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

http://security.gentoo.org/glsa/glsa-200508-19.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 (at) gentoo (dot) org [email concealed] 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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