Use-After-Free Vulnerability in Linux Kernel (CVE-2013-4343)
Summary
CVE-2013-4343: Use-after-free vulnerability in drivers/net/tun.c in the Linux kernel through 3.11.1 allows local users to gain privileges by leveraging the CAP_NET_ADMIN capability and providing an invalid tuntap interface name in a TU... Affects linux versions < 3.11.5-1. Fixed in 3.11.5-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages system resources and hardware interactions, providing essential services for software applications. The kernel is designed for stability, security, and performance, but vulnerabilities can arise, exposing systems to potential threats. CVE-2013-4343 is a specific vulnerability in the Linux kernel that affects versions up to 3.11.1, allowing local users with certain capabilities to exploit the system.
Vulnerability Detail
CVE-2013-4343 is a use-after-free vulnerability located in the tun.c driver of the Linux kernel. This flaw allows local users to gain elevated privileges by leveraging the CAP_NET_ADMIN capability and providing an invalid tuntap interface name during a TUNSETIFF ioctl call. The vulnerability originates from improper memory management, which can lead to unauthorized access and control over system resources, potentially compromising the integrity and security of the affected system.
How To Fix
Minimum fixed version
3.11.5-1
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
As a temporary workaround, users can limit access to the CAP_NET_ADMIN capability for local users until the kernel is updated. This can be done by modifying user permissions or using security modules like AppArmor or SELinux to restrict access.
Conclusion
CVE-2013-4343 is a critical vulnerability in the Linux kernel that can allow local users to escalate their privileges. It is essential to upgrade to a patched version of the kernel to mitigate the risk. Users should also consider implementing temporary workarounds to limit exposure until an upgrade can be performed.
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FAQ
CVE-2013-4343 is a use-after-free vulnerability in the Linux kernel that allows local users to gain elevated privileges.
The vulnerability affects Linux kernel versions up to 3.11.1.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor vulnerabilities without requiring installation.
If an immediate upgrade is not possible, consider restricting access to the CAP_NET_ADMIN capability as a temporary measure.
Exploitation of this vulnerability can lead to unauthorized access and control over system resources, compromising system integrity and security.
References
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