Vulnerability in Xen Package: CVE-2023-46839
Summary
CVE-2023-46839: PCI devices can make use of a functionality called phantom functions, that when enabled allows the device to generate requests using the IDs of functions that are otherwise unpopulated. Affects xen versions < 4.16.5-r6. Fixed in 4.16.5-r6. How to fix ↓
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Background
The Xen package is an open-source hypervisor that provides virtualization capabilities for various operating systems. It allows multiple guest operating systems to run on a single host system. The package is widely used in cloud computing environments and virtualization platforms. However, a vulnerability has been discovered in Xen that could potentially lead to the assignment of phantom functions to a different domain, compromising the integrity and security of the primary device.
Vulnerability Detail
The vulnerability (CVE-2023-46839) in Xen involves the use of phantom functions by PCI devices. These phantom functions, when enabled, allow the device to generate requests using unpopulated function IDs, effectively extending the number of outstanding requests. While these phantom functions require an IOMMU context setup, failure to set up the context is not fatal when the device is assigned. This can result in the primary device being assigned to a guest, while some of the phantom functions are assigned to a different domain. This misassignment can lead to potential security breaches and unauthorized access to sensitive data.
How To Fix
Minimum fixed version
4.16.5-r6
This is the first release that contains the fix.
sudo apk add --upgrade xenTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The vulnerability in the Xen package (CVE-2023-46839) can lead to the misassignment of phantom functions, potentially compromising the security of the primary device. It is crucial to update the Xen package to the fixed versions mentioned above to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for xen →
FAQ
The vulnerability can result in the misassignment of phantom functions to a different domain, potentially leading to security breaches and unauthorized access to sensitive data.
The vulnerability affects Xen versions prior to 4.16.5-r6 for Alpine:v3.16 and Alpine:v3.17 ecosystems, and prior to 4.17.3-r0 for Alpine:v3.18 ecosystem, and prior to 4.18.0-r3 for Alpine:v3.19 ecosystem.
There is no known exploit available for this vulnerability at the moment.
The recommended mitigation is to update the Xen package to the fixed versions mentioned above.
You can find more information about this vulnerability in the CVE-2023-46839 JSON report available at the following source: https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-46839.json
References
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