Openvswitch: Stack Out-of-Bounds Read Vulnerability
Summary
UVI-2021-1000072: openvswitch: fix stack OOB read while fragmenting IPv4 packets. Affects Kernel versions >= d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221, < b3502b04e84ac5349be95fc033c17bd701d2787a. No fix is published. How to fix ↓
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Background
Openvswitch is a software-based virtual switch that is commonly used in virtualized environments. It provides network connectivity and switching capabilities for virtual machines. The vulnerability in Openvswitch affects the fragmentation of IPv4 packets, leading to a stack out-of-bounds read. This vulnerability can potentially be exploited by an attacker to gain unauthorized access or cause a denial-of-service condition.
Vulnerability Detail
The vulnerability in Openvswitch arises from a stack out-of-bounds read while fragmenting IPv4 packets. This can occur when processing specially crafted packets, leading to the potential disclosure of sensitive information or a system crash. The vulnerability was introduced in version v4.16 of the Linux Kernel and is fixed in version v5.12.3. It is important to note that the actual impact and attack feasibility of this vulnerability have not been proven.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, if updating the Linux Kernel is not immediately feasible, network administrators can consider implementing additional security measures such as network segmentation, access control lists, and traffic filtering to mitigate the risk of exploitation. However, applying the official patch by updating the Linux Kernel is the recommended solution.
Conclusion
The stack out-of-bounds read vulnerability in Openvswitch while fragmenting IPv4 packets can pose a significant risk to the security and stability of virtualized environments. It is crucial to promptly update the Linux Kernel to version v5.12.3 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
Openvswitch is a software-based virtual switch used in virtualized environments to provide network connectivity and switching capabilities for virtual machines.
This vulnerability in Openvswitch can potentially allow an attacker to gain unauthorized access or cause a denial-of-service condition.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.12.3 or later, which includes the necessary patch to address the issue.
As a workaround, network administrators can implement additional security measures such as network segmentation, access control lists, and traffic filtering to mitigate the risk of exploitation.
For more information about this vulnerability, you can refer to the official references provided in the vulnerability details section.
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