16064 : Linux Kernel it87 Driver Insecure File Creation
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Info

Last Modified
10 months ago

Percent Complete
100%

Disclosure
May 02, 2005

Discovery
Unknown

Dates

Exploit
Unknown

Solution
Unknown

Description

 The hardware monitoring drivers for the it87 and via686a chipsets in the Linux kernel contains a flaw that may allow a local denial of service. These drivers create a sysfs file called "alarms" incorrectly in R/W mode. The issue is triggered when a local user attempts to write to this file, and will result in loss of availability for the system by utilizing the CPU at 100% until the system is rebooted.

Classification

 Location: Local Access Required
Attack Type: Denial of Service
Impact: Loss of Availability
Exploit: Exploit Unknown
Disclosure: OSVDB Verified

Technical

 Only kernels with the lm_sensor modules included are potentially vulnerable. The it87 module was ported to the kernel at version 2.5.69, and the via686a module was ported to the kernel at version 2.5.67. Systems with prior kernels, whether running the lm_sensors package or not, are apparently not vulnerable.

Solution

 Upgrade to version 2.6.11.8 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
Linux
Watch-list
Kernel
Watch-list
 2.6.11.7
2.6.11.8

References

Tools & Filters

Nessus

 18377 18598 20522

Credit
  • Jean Delvare - khaliBrand New Doo Doolinux-fr.org -
  • Greg Kroah-Hartman - gregkhBrand New Doo Doosuse.de -

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