MTU Regression in xfrm
Summary
GSD-2022-1000922: xfrm: fix MTU regression. Affects Kernel versions >= 8278804e05f6bcfe3fdfea4a404020752ead15a6, < d4d5190b942ac7a0f048db718c0a9f280b4fc2ce. No fix is published. How to fix ↓
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Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the core functionality for the Linux operating system. The xfrm module in the Linux Kernel is responsible for IPsec protocol handling and network packet transformation. It allows for secure communication over IP networks by encrypting and authenticating network packets. However, a vulnerability has been discovered in the xfrm module that leads to a regression in the Maximum Transmission Unit (MTU) handling.
Vulnerability Detail
The MTU regression vulnerability in the xfrm module of the Linux Kernel allows an attacker to cause a denial-of-service (DoS) condition by sending specially crafted network packets. The vulnerability was introduced in version v4.14.16 of the Linux Kernel and was fixed in version v4.14.270. The regression affects the handling of MTU values, which determine the maximum size of network packets that can be transmitted without fragmentation. By exploiting this vulnerability, an attacker can cause network connectivity issues and disrupt communication between systems.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround available for this vulnerability. However, network administrators can mitigate the impact by implementing network-level protections such as firewalls and intrusion detection systems (IDS) to detect and block malicious network packets. It is also recommended to monitor network traffic for any signs of exploitation and apply appropriate filtering rules to mitigate the risk.
Conclusion
The MTU regression vulnerability in the xfrm module of the Linux Kernel can lead to network connectivity issues and disruption of communication between systems. It is crucial to update the Linux Kernel to version v4.14.270 or later to mitigate this vulnerability. Regularly updating the Linux Kernel is recommended to ensure the latest security patches and fixes are applied. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The xfrm module in the Linux Kernel is responsible for IPsec protocol handling and network packet transformation. It allows for secure communication over IP networks by encrypting and authenticating network packets.
The MTU regression vulnerability can cause a denial-of-service (DoS) condition by disrupting network connectivity and communication between systems.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your Linux Kernel version is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will provide real-time alerts for open-source vulnerabilities.
At the time of this report, there are no known public exploits for the MTU regression vulnerability in the xfrm module of the Linux Kernel. However, it is important to apply the recommended security updates to mitigate the risk.
You can find more information about the fix for the MTU regression vulnerability in the xfrm module of the Linux Kernel in the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/).
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