Denial of Service Vulnerability in Xen Package: CVE-2017-10923
Summary
ALPINE-CVE-2017-10923: Xen through 4.8.x does not validate a vCPU array index upon the sending of an SGI, which allows guest OS users to cause a denial of service (hypervisor crash), aka XSA-225. Affects xen versions < 4.9.0-r0. Fixed in 4.9.0-r0. 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 is known for its efficiency and flexibility, enabling users to manage virtual machines effectively. However, it has been identified that certain versions of Xen are vulnerable to a denial of service attack due to improper validation of vCPU array indices when sending a Software Generated Interrupt (SGI).
Vulnerability Detail
The vulnerability, identified as CVE-2017-10923, arises from Xen's failure to validate a vCPU array index during the SGI sending process. This oversight can be exploited by guest OS users, leading to a potential hypervisor crash, which results in a denial of service. The issue is classified under XSA-225 and affects Xen versions up to 4.8.x. The ramifications of this vulnerability are significant, as it can disrupt services hosted on the affected hypervisor, impacting all virtual machines running on it.
How To Fix
Minimum fixed version
4.9.0-r0
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
As a temporary workaround, users can limit access to the hypervisor or restrict the ability of guest OS users to send SGIs. This can be done by configuring the hypervisor settings to minimize exposure to untrusted guests.
Conclusion
In summary, CVE-2017-10923 is a critical vulnerability in the Xen hypervisor that can lead to denial of service attacks. Users are advised to update to the patched version to ensure the security and stability of their virtualized environments. For ongoing monitoring of vulnerabilities, consider using Vulert, which provides real-time alerts based on your manifest files.
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FAQ
CVE-2017-10923 is a vulnerability in the Xen hypervisor that allows guest OS users to crash the hypervisor by sending invalid Software Generated Interrupts.
Xen versions up to 4.8.x are affected by this vulnerability. Users should upgrade to version 4.9.0-r0 or later.
Exploitation of this vulnerability can lead to a denial of service, causing the hypervisor to crash and disrupting all virtual machines running on it.
You can use Vulert, which monitors open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
Yes, temporarily limiting access to the hypervisor or restricting guest OS capabilities can help mitigate the risk until an update is applied.
References
Related vulnerabilities
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