tipc: skb_linearize the head skb when reassembling msgs
Summary
GSD-2021-1000704: tipc: skb_linearize the head skb when reassembling msgs. Affects Kernel versions >= 45c8b7b175ceb2d542e0fe15247377bf3bce29ec, < b2c8d28c34b3070407cb1741f9ba3f15d0284b8b. 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 between hardware and software. It manages system resources, facilitates communication between processes, and ensures security and stability. The vulnerability identified in this report affects the Kernel's TIPC (Transparent Inter-Process Communication) module. TIPC is a protocol that enables communication between processes running on different nodes in a cluster. It provides reliable and ordered message delivery, making it suitable for various distributed applications.
Vulnerability Detail
The vulnerability in the TIPC module involves the reassembly of messages. When messages are received in fragments, the TIPC module attempts to reassemble them into complete messages. However, it fails to linearize the head skb (socket buffer) during this process. This can lead to a situation where the head skb is not properly linearized, resulting in potential memory corruption or information disclosure. An attacker could exploit this vulnerability to execute arbitrary code, escalate privileges, or obtain sensitive information.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a possible workaround is to disable the TIPC module. This can be achieved by removing the TIPC kernel module or preventing it from being loaded. However, disabling the TIPC module may impact applications or services that rely on TIPC for inter-process communication.
Conclusion
The identified vulnerability in the TIPC module of the Linux Kernel can potentially lead to memory corruption or information disclosure. It is crucial to update the Kernel to version v4.4.271 or later to mitigate this risk. Alternatively, disabling the TIPC module can serve as a temporary workaround. Regularly monitoring for open-source vulnerabilities using tools like Vulert can help ensure the security of your software.
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FAQ
This vulnerability can potentially allow an attacker to execute arbitrary code, escalate privileges, or obtain sensitive information.
You can use Vulert's 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 in real-time to identify any open-source vulnerabilities, including this one.
At the time of this report, there are no known public exploits for this vulnerability. However, it is important to apply the recommended fix or workaround to mitigate the risk.
Yes, you can disable the TIPC module as a temporary measure until you can update the Kernel. However, keep in mind that this may impact applications or services relying on TIPC for inter-process communication.
For further support on vulnerability remediation or any related concerns, please reach out to info@devnack.com.
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