UAF Vulnerability in j1939_netdev_start() Function of Kernel
Summary
GSD-2021-1002004: can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv. Affects Kernel versions >= 9d71dd0c70099914fcd063135da3c580865e924c, < a0e47d2833b4f65e6c799f28c6b636d36b8b936d. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It manages system resources, including memory, processes, and input/output operations. The j1939_netdev_start() function is part of the Controller Area Network (CAN) subsystem in the Kernel, specifically related to the J1939 protocol. This protocol is commonly used in heavy-duty vehicles for communication between electronic control units (ECUs). The j1939_netdev_start() function is responsible for initializing the network device for J1939 communication.
Vulnerability Detail
The vulnerability identified as GSD-2021-1002004 in the j1939_netdev_start() function of the Kernel's CAN subsystem involves a use-after-free (UAF) issue related to the rx_kref field of the j1939_priv structure. This vulnerability can be exploited by an attacker to cause a denial-of-service (DoS) condition or potentially execute arbitrary code with kernel privileges. The UAF occurs when the rx_kref field is accessed after it has been freed, leading to undefined behavior and potential security implications.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can mitigate the risk associated with this vulnerability by disabling the affected functionality or removing the vulnerable module from the Kernel configuration. However, it is strongly advised to apply the official patch or update the Kernel to ensure comprehensive security.
Conclusion
The UAF vulnerability in the j1939_netdev_start() function of the Kernel's CAN subsystem poses a significant risk to the security and stability of affected systems. It is crucial to promptly apply the recommended patch or update the Kernel to mitigate the vulnerability. For further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The vulnerability can lead to a denial-of-service (DoS) condition or enable an attacker to execute arbitrary code with kernel privileges, potentially compromising the entire system.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it in real-time to identify any open-source vulnerabilities, including this specific UAF vulnerability.
At the time of this report, there are no known public exploits targeting this specific vulnerability. However, it is crucial to apply the recommended patch or update the Kernel to mitigate any potential risks.
This vulnerability requires local access to the system to exploit it. However, if an attacker gains local access, they can potentially exploit the vulnerability to escalate privileges or disrupt system functionality.
For more detailed information about this vulnerability, including its technical aspects and the specific code changes made to address it, you can refer to the vulnerability ID GSD-2021-1002004 in the Vulert Database at Vulert Scanner.
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