Vulnerability in comedi: dt9812 package - Fix DMA buffers on stack
Summary
GSD-2021-1001948: comedi: dt9812: fix DMA buffers on stack. Affects Kernel versions >= 63274cd7d38a3322d90b66a5bc976de1fb899051, < 365a346cda82f51d835c49136a00a9df8a78c7f2. No fix is published. How to fix ↓
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Background
The comedi package is a Linux kernel driver framework that provides a unified interface for various data acquisition and control devices. It allows userspace programs to interact with these devices through a consistent API. One of the supported devices is the dt9812, which is used for data acquisition.
The vulnerability in the dt9812 driver arises from the usage of DMA (Direct Memory Access) buffers on the stack. DMA is a mechanism that allows devices to transfer data directly to and from memory without involving the CPU. However, using DMA buffers on the stack can lead to stack-based buffer overflows and other memory corruption issues.
Vulnerability Detail
The vulnerability in the comedi dt9812 driver occurs due to the usage of DMA buffers on the stack. This can be exploited by an attacker to overwrite adjacent memory regions, leading to potential code execution or system crashes. The vulnerability was introduced in version v2.6.29 of the Linux Kernel and is fixed in version v4.9.290.
To exploit this vulnerability, an attacker would need to have local access to a system with the affected driver and the ability to send specially crafted input to trigger the buffer overflow.
It is important to note that the impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by ensuring that only trusted users have access to systems with the affected driver. Additionally, implementing proper access controls and monitoring can help detect and prevent potential exploitation.
Conclusion
The vulnerability in the comedi dt9812 driver, which involves the usage of DMA buffers on the stack, can lead to stack-based buffer overflows and other memory corruption issues. It is crucial to update the Linux Kernel to version v4.9.290 or later to mitigate this vulnerability. Additionally, implementing proper access controls and monitoring can help prevent potential exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Comedi is a Linux kernel driver framework that provides a unified interface for data acquisition and control devices. It allows userspace programs to interact with these devices through a consistent API.
The dt9812 is a data acquisition device supported by the comedi framework. It is used for acquiring data from various sensors and inputs.
A DMA buffer is a region of memory used for direct memory access by devices. It allows devices to transfer data to and from memory without involving the CPU.
The vulnerability can lead to stack-based buffer overflows and other memory corruption issues. This can potentially result in code execution or system crashes.
To protect your system, it is recommended to update the Linux Kernel to version v4.9.290 or later, which includes the fix for this vulnerability. Additionally, ensure that only trusted users have access to systems with the affected driver and implement proper access controls and monitoring.
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