Information Leakage in /proc/net/ptype in Linux Kernel
Summary
GSD-2022-1000623: net: fix information leakage in /proc/net/ptype. Affects Kernel versions >= 2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50, < 839ec7039513a4f84bfbaff953a9393471176bee. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware. It includes various subsystems, such as networking, file systems, and process management. The /proc/net/ptype file is a virtual file that provides information about the packet types registered in the kernel. It is accessible to all users and can be read to obtain details about the registered packet types.
Vulnerability Detail
The vulnerability in /proc/net/ptype allows unauthorized users to access sensitive information. By reading the file, an attacker can gather information about the registered packet types, potentially revealing details about the system's network configuration and protocols. This information leakage can aid in further attacks, such as network reconnaissance or targeted exploits. The vulnerability was introduced in Linux Kernel version 2.6.26 and has been fixed in version 5.16.5.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can restrict access to the /proc/net/ptype file by modifying the file permissions. By setting the file's permissions to only allow access by privileged users (e.g., root), the risk of information leakage can be mitigated. This can be achieved by executing the following command:
chmod 600 /proc/net/ptype
However, it is important to note that this workaround only limits access to the file and does not address the underlying vulnerability. Updating the kernel to the fixed version is still recommended.
Conclusion
The information leakage vulnerability in /proc/net/ptype in the Linux Kernel can allow unauthorized users to access sensitive information about registered packet types. It is recommended to update the kernel to version 5.16.5 or later to fix this vulnerability. Restricting access to the file through permissions can provide a temporary workaround, but updating the kernel is still necessary. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows unauthorized users to access sensitive information about the registered packet types in the Linux Kernel. This information can be leveraged for further attacks, such as network reconnaissance or targeted exploits.
You can use the Vulert 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 for any open-source vulnerabilities, including this one.
Yes, the vulnerability has been fixed in Linux Kernel version 5.16.5. It is recommended to update the kernel to this version or a later one to mitigate the vulnerability.
Yes, you can restrict access to the /proc/net/ptype file by modifying its permissions. Setting the file's permissions to only allow access by privileged users (e.g., root) can help mitigate the risk of information leakage. However, updating the kernel to the fixed version is still recommended.
You can find more information about this vulnerability in the GSD database entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2022/1000xxx/GSD-2022-1000623.json
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