Race Condition Vulnerability in Linux Kernel's CAN-ISOTP Module
Summary
GSD-2022-1000359: can: isotp: fix potential CAN frame reception race in isotp_rcv(). Affects Kernel versions >= e057dd3fc20ffb3d7f150af46542a51b59b90127, < 7b53d2204ce79b27a878074a77d64f40ec21dbca. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for hardware abstraction, process management, memory management, and device drivers. One of the modules within the Linux Kernel is the CAN-ISOTP module, which implements the ISO 15765-2 protocol for communication over Controller Area Network (CAN) buses. This protocol is commonly used in automotive and industrial applications.
The vulnerability identified in the CAN-ISOTP module is a race condition that occurs during the reception of CAN frames. A race condition is a software flaw that arises when multiple threads or processes access shared data concurrently, leading to unexpected behavior or security vulnerabilities. In this case, the race condition can potentially allow an attacker to manipulate the reception of CAN frames, leading to unauthorized access or disruption of communication.
Vulnerability Detail
The race condition vulnerability in the CAN-ISOTP module of the Linux Kernel can be exploited by an attacker to manipulate the reception of CAN frames. By carefully timing their actions, an attacker can interfere with the normal flow of CAN frame reception, potentially leading to unauthorized access or disruption of communication between CAN devices.
The vulnerability was introduced in version v5.10 of the Linux Kernel by commit e057dd3fc20ffb3d7f150af46542a51b59b90127. It was fixed in version v5.10.101 by commit 7b53d2204ce79b27a878074a77d64f40ec21dbca. Therefore, systems running affected versions of the Linux Kernel should be updated to a version that includes the fix.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. However, as a general security best practice, it is recommended to ensure that systems running the Linux Kernel with the CAN-ISOTP module are protected by appropriate network security measures, such as firewalls and intrusion detection systems. Additionally, regular monitoring of CAN bus activity can help detect any abnormal behavior that may indicate exploitation of the vulnerability.
Conclusion
The race condition vulnerability in the CAN-ISOTP module of the Linux Kernel poses a potential risk to the security and reliability of systems utilizing the ISO 15765-2 protocol for communication over CAN buses. It is crucial to update the Linux Kernel to a fixed version (v5.10.101 or later) to mitigate the risk of unauthorized access or disruption of communication. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The race condition vulnerability in the CAN-ISOTP module of the Linux Kernel can potentially allow an attacker to manipulate the reception of CAN frames, leading to unauthorized access or disruption of communication between CAN devices.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any open-source vulnerabilities, including this race condition vulnerability in the Linux Kernel's CAN-ISOTP module.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to promptly apply the fix to mitigate the risk of potential exploitation.
Yes, this vulnerability can be exploited remotely if the affected system is accessible over a network that allows communication with CAN devices. It is therefore crucial to update the Linux Kernel to a fixed version to prevent potential remote exploitation.
While updating the Linux Kernel is the recommended solution, implementing network security measures, such as firewalls and intrusion detection systems, can help mitigate the risk of exploitation. Regular monitoring of CAN bus activity can also aid in detecting any abnormal behavior that may indicate exploitation of the vulnerability.
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