Sensor drivers, in general, do not have any access to memory that they did not own before being registered. For example, if a sensor registers a buffer that was copied from user memory, the sensor driver is the only one that could have done that. This could lead to a sensor driver reading from or writing to kernel memory that it does not own. This out of bounds read or write can result in a local denial of service in the sensor driver. Sensor drivers are not subject to the same code review standards as other code. One reason for this is that sensor drivers are often developed by networking and other non-kernel developers. Another reason is that sensor drivers are often developed by non-programmers. Sensor drivers are often developed by vendors and sensor hardware companies. Vendors and sensor hardware companies often do not follow the same coding standards as other developers. Vendors and sensor hardware companies often do not follow the same security standards as other developers. This means that the same code review standards and security standards that are normally used for other code might not be used for sensor drivers.
Sensor Driver Vulnerabilities
A vulnerability in a sensor driver might allow for remote code execution and/or privilege escalation, resulting in an attacker gaining access to the system. This could lead to a local denial of service or takeover of the system. Sensor drivers are not subject to the same code review standards as other code, so it is less likely for vulnerabilities like this one to be discovered.
Sensor Driver Vulnerabilities: The Problem With Finding Vulnerabilities In Sensors
How do I know if I’m vulnerable?
There are three main ways to know if you are vulnerable to a sensor driver out of bounds read or write.
1) If you have a buffer that was copied from user memory and then the sensor driver writes to that buffer, it may cause a local denial of service.
2) If you have an application running on your system with a sensor driver, and the application calls write() on an uninitialized buffer, it may cause a local denial of service.
3) If you have an application running on your system with a sensor driver and it calls mmap() or mprotect(), these calls could be used to cause a local denial of service.
How to detect out of bounds reads in sensor drivers?
The code review process is the first line of defense against out of bounds reads in sensor drivers. It includes taking a look at the sensors and their drivers and verifying that they are compliant with the appropriate standards. If a sensor driver does not appear to be compliant with the appropriate security standards, it should be rejected from the kernel.
What can be done to prevent CVE-2022-39124?
Vendor and sensor hardware companies need to follow the same code review standards as other developers. Vendor and sensor hardware companies need to follow the same security standards as other developers.
Timeline
Published on: 10/14/2022 19:15:00 UTC
Last modified on: 10/18/2022 18:11:00 UTC