net: validate lwtstate->data before returning from skb_tunnel_info() - Kernel
Summary
GSD-2021-1001470: net: validate lwtstate->data before returning from skb_tunnel_info(). Affects Kernel versions >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < e7f3c9df40515a6c6b46f36c4c94cf48a043f887. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system. It provides essential services and functions to enable the proper functioning of the system. The vulnerability in question affects the Kernel's networking subsystem. The skb_tunnel_info() function, which is responsible for retrieving tunnel information from a socket buffer, does not properly validate the lwtstate->data field before returning. This oversight could potentially lead to security vulnerabilities.
Vulnerability Detail
The vulnerability arises from the lack of validation of the lwtstate->data field in the skb_tunnel_info() function. Attackers could exploit this vulnerability to execute arbitrary code or perform other malicious activities. The impact and attack plausibility have not been proven yet, but it is crucial to address this issue to prevent potential security breaches. The vulnerability was introduced in version v4.3 of the Linux Kernel and has been fixed in version v4.4.277.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the latest version of the Linux Kernel, there is no specific workaround available. It is advised to update the Kernel to the latest version to address the issue.
Conclusion
The vulnerability in the Kernel's networking subsystem, specifically in the skb_tunnel_info() function, could potentially lead to security breaches. It is crucial to update the Linux Kernel to version v4.4.277 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven, but it could potentially allow attackers to execute arbitrary code or perform other malicious activities.
You can use Vulert's 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 one.
As this vulnerability has been fixed in the latest version of the Linux Kernel, it is recommended to update the Kernel to address the issue. There is no specific workaround available.
This vulnerability affects versions of the Linux Kernel starting from v4.3 up to v4.4.276. It has been fixed in version v4.4.277.
You can find more information about this vulnerability in the GSD-2021-1001470 entry on the Cloud Security Alliance's GSD database. The link to the specific entry is provided in the references section of this report.
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