Local Keystroke Information Exposure in Linux Kernel - CVE-2011-4915
Summary
DEBIAN-CVE-2011-4915: fs/proc/base.c in the Linux kernel through 3.1 allows local users to obtain sensitive keystroke information via access to /proc/interrupts. Affects linux versions 5.10.103-1 – 6.9.9-1. 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 hardware resources and providing essential services to applications. It is widely used across various platforms, from servers to embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability affects multiple Debian versions of the Linux kernel, allowing local users to access sensitive information.
Vulnerability Detail
The vulnerability identified as CVE-2011-4915 exists in the Linux kernel's handling of the /proc filesystem, specifically in the fs/proc/base.c file. This flaw allows local users to read the /proc/interrupts file, which can expose sensitive keystroke information. The potential ramifications include unauthorized access to user input data, leading to privacy breaches and security risks. The vulnerability is particularly concerning as it can be exploited by any local user with access to the system, making it critical for environments where sensitive information is handled.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, system administrators can restrict access to the /proc/interrupts file by modifying file permissions or using access control lists (ACLs) to limit which users can read this file. For example, to change permissions, you can use the command: sudo chmod o-r /proc/interrupts.
Conclusion
CVE-2011-4915 is a significant vulnerability in the Linux kernel that exposes sensitive keystroke information to local users. It is crucial for users to update their systems to the patched version of the Linux package to protect against potential privacy breaches. Implementing workarounds can provide temporary relief, but updating is the most effective solution.
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FAQ
CVE-2011-4915 is a vulnerability in the Linux kernel that allows local users to access sensitive keystroke information through the /proc/interrupts file.
Debian versions 11, 12, 13, and 14 are affected by this vulnerability in the Linux package.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring signup.
The risks include unauthorized access to sensitive user input data, which can lead to privacy breaches and potential exploitation by malicious local users.
Yes, a patch is available. Users should update their Linux kernel to the latest version to mitigate this vulnerability.
References
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