inet_diag: Fix Kernel-Infoleak for UDP Sockets in Linux Kernel
Summary
GSD-2021-1002695: inet_diag: fix kernel-infoleak for UDP sockets. Affects Kernel versions >= 3c4d05c8056724aff3abc20650807dd828fded54, < 3a4f6dba1eb98101abc012ef968a8b10dac1ce50. 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 essential functionality. It is a critical piece of software that interacts with hardware, drivers, and user applications. The kernel includes various subsystems, including networking, which handles communication between different devices and hosts. One such subsystem is the inet_diag module, which provides diagnostic information about network sockets. UDP (User Datagram Protocol) is a connectionless protocol used for lightweight and fast communication. However, a vulnerability has been discovered in the inet_diag module that can lead to a kernel-infoleak for UDP sockets.
Vulnerability Detail
The vulnerability in the inet_diag module allows an attacker to leak kernel information through UDP sockets. This information leakage can potentially expose sensitive data or provide insights into the system's internal state. The vulnerability was introduced in version v3.3 of the Linux Kernel by commit 3c4d05c8056724aff3abc20650807dd828fded54 and is fixed in version v5.10.88 by commit 3a4f6dba1eb98101abc012ef968a8b10dac1ce50. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The inet_diag vulnerability in the Linux Kernel allows for kernel-infoleak through UDP sockets. It is crucial to update the kernel to version v5.10.88 or later to address this vulnerability. Regularly applying security updates and following best practices for system maintenance is essential to ensure the security and stability of the Linux operating system. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, if successfully exploited, it could lead to the leakage of sensitive kernel information through UDP sockets.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
The remote exploitability of this vulnerability is not yet determined. Further analysis is required to assess the potential for remote exploitation.
The recommended mitigation is to update the Linux Kernel to version v5.10.88 or later. This will include the fix for the vulnerability.
There is no known evidence of active exploits targeting this vulnerability at the moment. However, it is always advisable to apply security updates promptly to mitigate potential risks.
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