Vulnerability in Linux Kernel: sit: do not call ipip6_dev_free() from sit_init_net()
Summary
GSD-2021-1002656: sit: do not call ipip6_dev_free() from sit_init_net(). Affects Kernel versions >= cf124db566e6b036b8bcbe8decbed740bdfac8c6, < e56b65c1e74d7f706d74b51baba15187be2fb4b5. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for the operating system, including device drivers, memory management, and process scheduling. The sit (IPv6-in-IPv4 tunneling) module is a part of the Linux Kernel that enables the encapsulation and transmission of IPv6 packets over IPv4 networks. It is responsible for handling the creation and management of sit devices. However, a vulnerability has been discovered in the sit module that can lead to potential security risks.
Vulnerability Detail
The vulnerability in the sit module arises from the improper calling of the ipip6_dev_free() function from the sit_init_net() function. This can result in memory corruption or use-after-free issues. An attacker could potentially exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been fully proven. The vulnerability was introduced in Linux Kernel version v4.12 by commit cf124db566e6b036b8bcbe8decbed740bdfac8c6 and has been fixed in version v4.19.222 by commit e56b65c1e74d7f706d74b51baba15187be2fb4b5.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
In conclusion, a vulnerability has been identified in the sit module of the Linux Kernel that can potentially lead to security risks. It is crucial to update the Linux Kernel to the latest version to mitigate this vulnerability. Implementing additional security measures and regularly monitoring for updates and patches is also recommended. For further support and assistance, please contact DevNack.com.
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FAQ
The impact of this vulnerability can vary depending on the attacker's capabilities and the target system. It could potentially lead to arbitrary code execution, privilege escalation, or denial-of-service.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the recommended fix to mitigate any potential risks.
If you are unable to update the Linux Kernel immediately, it is recommended to implement other security measures such as network segmentation, access controls, and intrusion detection systems to minimize the risk of exploitation.
You can find more information about this vulnerability in the official Linux Kernel security advisories and the CVE database. Additionally, you can reach out to info@devnack.com for further support and assistance.
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