Out-of-bounds read vulnerability in um package
Summary
GSD-2022-1003749: um: Fix out-of-bounds read in LDT setup. Affects Kernel versions >= 858259cf7d1c443c836a2022b78cb281f0a9b95e, < 9caad70819aef3431abaf73ba5163b55b161aba0. No fix is published. How to fix ↓
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Background
The um package is a component of the Linux Kernel, which is responsible for providing a virtual machine that runs on top of the host operating system. It allows users to run different Linux distributions within a single host environment. The um package utilizes the LDT (Local Descriptor Table) setup for managing memory segments and access permissions within the virtual machine.
Vulnerability Detail
The um package is affected by an out-of-bounds read vulnerability in the LDT setup. This vulnerability, identified as GSD-2022-1003749, allows an attacker to read data from memory locations beyond the intended boundaries. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v2.6.15 of the Linux Kernel and has been fixed in version v5.4.198 by commit 9caad70819aef3431abaf73ba5163b55b161aba0.
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 out-of-bounds read vulnerability in the um package's LDT setup can potentially lead to unauthorized access to sensitive data within the virtual machine. It is recommended to update the Linux Kernel to version v5.4.198 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The um package is a component of the Linux Kernel that provides a virtual machine environment for running Linux distributions within a host operating system.
LDT (Local Descriptor Table) setup is a mechanism used by the um package to manage memory segments and access permissions within the virtual machine.
An out-of-bounds read vulnerability occurs when a program reads data from memory locations beyond the intended boundaries, potentially exposing sensitive information or causing a crash.
The impact of this vulnerability is currently unknown, as the actual attack plausibility has not been proven. However, it could potentially lead to unauthorized access to sensitive data within the virtual machine.
You can use 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.
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