CWE-1314: Missing Write Protection for Parametric Data Values

Description

The device does not write-protect the parametric data values for sensors that scale the sensor value, allowing untrusted software to manipulate the apparent result and potentially damage hardware or cause operational failure.

Submission Date :

July 14, 2020, midnight

Modification Date :

2023-06-29 00:00:00+00:00

Organization :

The Intel Corporation
Extended Description

Various sensors are used by hardware to detect any devices operating outside of the design limits. The threshold limit values are set by hardware fuses or trusted software such as the BIOS. These limits may be related to thermal, power, voltage, current, and frequency. Hardware mechanisms may be used to protect against alteration of the threshold limit values by untrusted software.

The limit values are generally programmed in standard units for the type of value being read. However, the hardware-sensor blocks may report the settings in different units depending upon sensor design and operation. The raw sensor output value is converted to the desired units using a scale conversion based on the parametric data programmed into the sensor. The final converted value is then compared with the previously programmed limits.

While the limit values are usually protected, the sensor parametric data values may not be. By changing the parametric data, safe operational limits may be bypassed.

Example Vulnerable Codes

Example - 1

Malicious software executes instructions to increase power consumption to the highest possible level while causing the clock frequency to increase to its maximum value.Such a program executing for an extended period of time would likely overheat the device, possibly resulting in permanent damage to the device.A ring, oscillator-based temperature sensor will generally report the sensed value asoscillator frequency rather than degrees centigrade. The temperature sensor will havecalibration values that are used to convert the detected frequency into the corresponding temperature in degrees centigrade.Consider a SoC design where the critical maximum temperature limit is set in fuse values to 100C andis not modifiable by software. If the scaled thermal sensor output equals or exceeds this limit, the system is commanded to shut itself down.The thermal sensor calibration values are programmable through registers that are exposed to system software.These registers allow software to affect the converted temperature output such that the output will never exceed the maximum temperature limit.

<xhtml_p>The sensor frequency value is scaled by applying the function:</xhtml_p>Sensed Temp = a + b * Sensor Freq<xhtml_p>where a and b are the programmable calibration data coefficients. Software sets a and b to zero ensuring the sensedtemperature is always zero.</xhtml_p>

This weakness may be addressed by preventing access to a and b.

<xhtml_p>The sensor frequency value is scaled by applying the function:</xhtml_p>Sensed Temp = a + b * Sensor Freq<xhtml_p>where a and b are the programmable calibration data coefficients. Untrusted software is prevented from changing the values of either a or b, preventing this method of manipulating the temperature.</xhtml_p>

Related Weaknesses

This table shows the weaknesses and high level categories that are related to this weakness. These relationships are defined to give an overview of the different insight to similar items that may exist at higher and lower levels of abstraction.

CWE-862: Missing Authorization
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CWE-1299: Missing Protection Mechanism for Alternate Hardware Interface
Go to

Visit http://cwe.mitre.org/ for more details.