GLSA Advocate
Joined: 12 May 2004 Posts: 2663
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Posted: Tue Aug 30, 2005 2:50 pm Post subject: [ GLSA 200508-19 ] lm_sensors: Insecure temporary file creat |
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Gentoo Linux Security Advisory
Title: lm_sensors: Insecure temporary file creation (GLSA 200508-19)
Severity: normal
Exploitable: local
Date: August 30, 2005
Bug(s): #103568
ID: 200508-19
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: sys-apps/lm_sensors
Vulnerable: < 2.9.1-r1
Unaffected: >= 2.9.1-r1
Architectures: All supported architectures
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: Code: | # emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/lm_sensors-2.9.1-r1" |
References
CAN-2005-2672
Last edited by GLSA on Sun May 07, 2006 4:58 pm; edited 1 time in total |
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