Denial of Service Vulnerability in Xen Package: CVE-2020-25598
Summary
ALPINE-CVE-2020-25598: An issue was discovered in Xen 4.14.x. Affects xen versions < 4.12.3-r4. Fixed in 4.12.3-r4. How to fix ↓
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Background
Xen is an open-source hypervisor that allows multiple operating systems to run concurrently on a single physical machine. It is widely used for virtualization in cloud computing and server environments. The Xen package provides essential functionalities for managing virtual machines, including resource allocation and isolation. However, it has been found to have a vulnerability that can lead to a Denial of Service (DoS) under specific conditions.
Vulnerability Detail
An issue was discovered in Xen 4.14.x where there is a missing unlock in the XENMEM_acquire_resource error path. This flaw in the Read, Copy, Update (RCU) mechanism can lead to an RCU reference being leaked, similar to forgetting to unlock a spinlock. A buggy or malicious HVM stubdomain can exploit this vulnerability, causing subsequent administration operations to livelock, resulting in a host Denial of Service. The vulnerability has been present since Xen 4.12, and while the side effects are believed to be benign on Xen 4.12 and 4.13, patches are provided for these versions as well.
How To Fix
Minimum fixed version
4.12.3-r4
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
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the available patches as soon as possible.
Conclusion
CVE-2020-25598 is a significant vulnerability in the Xen hypervisor that can lead to Denial of Service under specific conditions. It is crucial for users to update their Xen packages to the patched versions to mitigate the risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the security of your systems.
See every vulnerability recorded for xen →
FAQ
CVE-2020-25598 is a vulnerability in the Xen hypervisor that can lead to a Denial of Service due to a missing unlock in the error handling path.
Xen versions 4.12, 4.13, and 4.14.x are affected by this vulnerability, with specific patched versions available for each.
You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities. You can check if your application is affected by using the Vulert playground without any signup.
The vulnerability can cause a Denial of Service, leading to system instability and unavailability of virtual machines managed by the Xen hypervisor.
The CVSS score of CVE-2020-25598 is 5.5, indicating a moderate severity level.
References
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