Memory Leak Vulnerability in Linux Kernel - CVE-2013-4205
Summary
CVE-2013-4205: Memory leak in the unshare_userns function in kernel/user_namespace.c in the Linux kernel before 3.10.6 allows local users to cause a denial of service (memory consumption) via an invalid CLONE_NEWUSER unshare call. Affects linux versions < 3.10.7-1. Fixed in 3.10.7-1. 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 facilitating communication between hardware and software. It provides essential services such as process management, memory management, and device control. The kernel is modular, allowing for various functionalities to be added or removed as needed. However, vulnerabilities can arise, such as CVE-2013-4205, which affects the user namespace functionality, potentially leading to denial of service through memory consumption.
Vulnerability Detail
CVE-2013-4205 is a memory leak vulnerability found in the unshare_userns function within the Linux kernel's user_namespace.c file. This vulnerability allows local users to exploit an invalid CLONE_NEWUSER unshare call, leading to excessive memory consumption. If exploited, this can result in a denial of service, as the system may become unresponsive due to resource exhaustion. The vulnerability affects multiple Debian versions of the Linux package, specifically those prior to version 3.10.7-1.
How To Fix
Minimum fixed version
3.10.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the fix by upgrading the kernel as detailed above.
Conclusion
CVE-2013-4205 represents a significant memory leak vulnerability in the Linux kernel that can lead to denial of service. Users are strongly advised to upgrade their kernel to the fixed version to mitigate the risks associated with this vulnerability. Utilizing tools like Vulert can help in monitoring for such vulnerabilities in real-time.
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FAQ
CVE-2013-4205 is a memory leak vulnerability in the Linux kernel that allows local users to cause denial of service through excessive memory consumption.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected by CVE-2013-4205 without any signup.
The vulnerability affects Linux kernel versions prior to 3.10.7-1 across multiple Debian releases.
Exploitation of this vulnerability can lead to denial of service, making the system unresponsive due to memory exhaustion.
Yes, a patch is available in the form of an upgrade to Linux kernel version 3.10.7-1 or later.
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