Vulnerability in Kernel: sctp_rcv_ootb
Summary
GSD-2021-1001647: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb. Affects Kernel versions >= 3acb50c18d8d6650f10919464ade4dcdaf41d62f, < 9c6591ae8e63f93c895ad5e2703c36c548aac997. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's Stream Control Transmission Protocol (SCTP) module, specifically the sctp_rcv_ootb function. SCTP is a transport layer protocol that offers reliable, message-oriented communication between hosts. This vulnerability arises when the skb_header_pointer function returns NULL, leading to a potential security issue.
Vulnerability Detail
The vulnerability in sctp_rcv_ootb occurs when the skb_header_pointer function returns NULL. This can be exploited by an attacker to cause a denial-of-service (DoS) condition or potentially execute arbitrary code. By carefully crafting malicious network packets, an attacker can trigger this vulnerability and disrupt the normal operation of the system. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been addressed in Linux Kernel version v5.10.71 by commit 9c6591ae8e63f93c895ad5e2703c36c548aac997. However, it was introduced in version v4.8 by commit 3acb50c18d8d6650f10919464ade4dcdaf41d62f.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can implement network-level mitigations to minimize the risk of exploitation. This can include filtering or blocking suspicious network traffic that may attempt to exploit the vulnerability. However, it is important to note that workarounds may not provide complete protection and updating to the fixed version of the Kernel is still the recommended approach.
Conclusion
The vulnerability in Kernel's sctp_rcv_ootb function poses a potential security risk, allowing for a denial-of-service condition or potential arbitrary code execution. It is crucial to update the Linux Kernel to version v5.10.71 or later to mitigate this vulnerability. Implementing network-level mitigations can serve as a temporary workaround, but it is not a substitute for updating to the fixed version. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability can range from a denial-of-service (DoS) condition to potential arbitrary code execution. However, the actual impact and attack plausibility have not been proven yet.
This vulnerability was introduced in Linux Kernel version v4.8 and affects all versions up to v5.10.70.
Yes, this vulnerability has been fixed in Linux Kernel version v5.10.71 by commit 9c6591ae8e63f93c895ad5e2703c36c548aac997.
To update the Linux Kernel, you can fetch the latest stable version from the official Git repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and apply the necessary patches. Alternatively, you can rely on package managers or system update mechanisms to automatically install the updated Kernel version.
Yes, as a temporary workaround, you can implement network-level mitigations to minimize the risk of exploitation. This can include filtering or blocking suspicious network traffic that may attempt to exploit the vulnerability. However, it is important to note that workarounds may not provide complete protection, and updating to the fixed version of the Kernel is still recommended.
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