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lm_sensors: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200508-19 / lm_sensors
Release Date August 30, 2005
Latest Revision August 30, 2005: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-apps/lm_sensors < 2.9.1-r1 >= 2.9.1-r1 All supported architectures

Related bugreports: #103568


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

2.  Impact Information


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


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


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.

3.  Resolution Information


There is no known workaround at this time.


All lm_sensors users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4.  References


Page updated August 30, 2005

Summary: This is a Gentoo Linux Security Advisory

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