Vulnerability in Kernel: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
Summary
GSD-2021-1001594: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb. Affects Kernel versions >= 3acb50c18d8d6650f10919464ade4dcdaf41d62f, < ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1. 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 acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The vulnerability in question affects the Kernel's Stream Control Transmission Protocol (SCTP) implementation. SCTP is a transport layer protocol that offers reliable, message-oriented communication between hosts over IP networks. This vulnerability specifically impacts the sctp_rcv_ootb function, which handles out-of-the-blue (OOTB) packets received by the SCTP stack.
Vulnerability Detail
The vulnerability arises when the skb_header_pointer function returns NULL within the sctp_rcv_ootb function. This can occur due to various reasons, such as memory corruption or an attacker deliberately crafting malicious packets. When NULL is returned, the code fails to properly handle the situation, leading to a potential kernel panic or other undefined behavior. The impact and attack plausibility of this vulnerability have not been proven yet, but it has been identified as a potential security risk. The vulnerability was introduced in version v4.8 of the Linux Kernel and has been fixed in version v5.4.151.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch manually to their existing Kernel version. The patch can be obtained from the Linux Kernel repository and applied using standard patching techniques. However, it is strongly advised to update to the latest stable version of the Kernel to ensure comprehensive vulnerability mitigation.
Conclusion
The vulnerability in the Kernel's SCTP implementation can lead to a kernel panic or other undefined behavior. It is crucial to update the Linux Kernel to version v5.4.151 or later to mitigate this vulnerability. Users can also apply the provided patch as a temporary workaround. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven, but it has the potential to cause a kernel panic or other undefined behavior, which could lead to system instability or denial of service.
You can use Vulert's online 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 for any open-source vulnerabilities, including this one.
As of now, there is no known exploit for this vulnerability. However, it is always recommended to promptly apply security updates to mitigate potential risks.
The remote exploitability of this vulnerability has not been determined yet. Further analysis and testing are required to assess the potential for remote exploitation.
If updating the Kernel is not immediately feasible, you can apply the provided patch manually to mitigate the vulnerability. However, it is strongly advised to update to the latest stable version of the Kernel as soon as possible.
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