Vulnerability in Kernel: memcpy() overflow of qed_dcbx_params()
Summary
GSD-2021-1001107: net: qed: Fix memcpy() overflow of qed_dcbx_params(). Affects Kernel versions < be0cfcf7e6988dbff80edec0d0654878f4d6f955. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The vulnerability in question affects the qed_dcbx_params() function within the qed network driver. This function is responsible for copying data using the memcpy() function, but it suffers from an overflow issue. This vulnerability could potentially be exploited by an attacker to execute arbitrary code or cause a denial-of-service condition.
Vulnerability Detail
The vulnerability arises due to an overflow in the memcpy() function used within the qed_dcbx_params() function. This overflow can occur when copying data, leading to a potential buffer overflow. If successfully exploited, an attacker could execute arbitrary code within the kernel context or cause a denial-of-service by crashing the system. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the security and stability of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has a fix available, it is recommended to apply the update rather than relying on workarounds. However, if updating immediately is not feasible, one possible workaround is to disable the qed network driver or remove the module from the kernel configuration. This can be achieved by executing the following commands:
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Disable qed network driver: $ sudo modprobe -r qed
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Remove qed module from kernel configuration: $ sudo echo 'blacklist qed' >> /etc/modprobe.d/blacklist.conf
Please note that these workarounds may impact the functionality of the network driver and should only be considered as temporary measures until the update can be applied.
Conclusion
The vulnerability in the Kernel's qed network driver, specifically in the qed_dcbx_params() function, poses a potential security risk. It is crucial to update the Linux Kernel to version v4.14.238 or later to address this vulnerability. Applying the fix will ensure that the memcpy() overflow issue is resolved, preventing potential exploitation and maintaining the security and stability of the system. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code within the kernel context or cause a denial-of-service condition by crashing the system.
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Yes, a fix for this vulnerability is available in the Linux Kernel version v4.14.238. It is recommended to update to this version or a later one to ensure the vulnerability is patched.
While it is recommended to apply the update to fix this vulnerability, you can temporarily disable the qed network driver or remove the module from the kernel configuration as a workaround. However, these workarounds may impact the functionality of the network driver and should only be used until the update can be applied.
You can find more information about this vulnerability, including the fix and its impact, in the vulnerability report available at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001107.json
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