Critical Off-by-One Vulnerability in Linux Kernel Packages
Summary
UBUNTU-CVE-2007-6762: In the Linux kernel before 2.6.20, there is an off-by-one bug in net/netlabel/netlabel_cipso_v4.c where it is possible to overflow the doi_def->tags[] array. 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 the Linux operating system, responsible for managing system resources and hardware interactions. It provides essential services for all other software running on the system. The kernel is modular, allowing for the addition of various functionalities through loadable modules. This flexibility makes it a powerful and widely used platform, but it also exposes it to potential vulnerabilities. The specific vulnerability in question affects multiple versions of the Linux kernel packages, including 'linux', 'linux-aws', 'linux-azure', and 'linux-lts-xenial'.
Vulnerability Detail
In the Linux kernel before version 2.6.20, an off-by-one bug exists in the file net/netlabel/netlabel_cipso_v4.c. This flaw can lead to an overflow of the doi_def->tags[] array, which may allow an attacker to exploit the system, potentially leading to unauthorized access or denial of service. The vulnerability has a CVSS score of 9.8, indicating a critical severity level, which underscores the urgency of addressing this issue.
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 system or disable the affected modules until the packages are updated. This can be done by using the following command to blacklist the modules:
echo 'blacklist <module_name>' | sudo tee -a /etc/modprobe.d/blacklist.conf
Replace <module_name> with the name of the affected module.
Conclusion
The off-by-one vulnerability in the Linux kernel presents a significant risk to systems running affected packages. It is crucial for users to update their packages promptly to the patched versions to safeguard their systems against potential exploits. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
The CVSS score of this vulnerability is 9.8, indicating a critical severity level.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without requiring any signup.
Exploitation of this vulnerability could lead to unauthorized access, data breaches, or denial of service, compromising the integrity and availability of the system.
Yes, patched versions of the affected packages are available. Users should update their packages to the latest versions to mitigate the risk.
If immediate updates are not possible, consider implementing temporary workarounds such as limiting access to the system or blacklisting affected modules.
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