Memory Disclosure Vulnerability in Linux Kernel Packages
Summary
UBUNTU-CVE-2020-10774: A memory disclosure flaw was found in the Linux kernel's versions before 4.18.0-193.el8 in the sysctl subsystem when reading the /proc/sys/kernel/rh_features file. Affects linux versions 3.11.0-12.19 – 3.13.0-98.145. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of Linux operating systems, responsible for managing hardware resources and enabling communication between software and hardware. It is widely used in various distributions, including Ubuntu. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability affects multiple versions of the Linux kernel, particularly those prior to 4.18.0-193.el8, exposing them to potential memory disclosure risks.
Vulnerability Detail
A memory disclosure flaw was identified in the Linux kernel's sysctl subsystem when reading the /proc/sys/kernel/rh_features file. This flaw allows local users to access uninitialized values from kernel memory, which could lead to the exposure of sensitive information. The vulnerability originates from improper handling of memory, potentially allowing attackers to gain insights into system operations or user data, thereby compromising confidentiality. The CVSS score for this vulnerability is 5.5, indicating a medium severity level.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit access to the /proc/sys/kernel/rh_features file by adjusting file permissions or restricting access to trusted users only. However, this is not a permanent solution and should be followed by applying the necessary updates.
Conclusion
The memory disclosure vulnerability in the Linux kernel poses a significant risk to system confidentiality. It is crucial for users to update their kernel packages to the latest versions to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
The vulnerability allows local users to read uninitialized memory values, potentially exposing sensitive information.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updates are not possible, consider applying the workaround by restricting access to the affected file.
No, while this report focuses on Ubuntu, the vulnerability affects multiple Linux distributions using the impacted kernel versions.
Vulert monitors and alerts for open-source vulnerabilities in software using a manifest file like package-lock.json, providing real-time insights into potential risks.
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