Critical Denial of Service Vulnerability in Xen Package
Summary
ALPINE-CVE-2017-10917: Xen through 4.8.x does not validate the port numbers of polled event channel ports, which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) or possibly obtain sensitive infor... 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 server virtualization and cloud computing. The Xen package is known for its robust performance and flexibility, but it has been identified to have a critical vulnerability that could lead to severe security risks, including denial of service and potential exposure of sensitive information.
Vulnerability Detail
The vulnerability, identified as CVE-2017-10917, originates from Xen versions up to 4.8.x, which fail to validate the port numbers of polled event channel ports. This oversight allows guest OS users to trigger a denial of service by causing a NULL pointer dereference, leading to a crash of the host operating system. Additionally, there is a potential risk of sensitive information leakage, making this a significant security concern for environments utilizing Xen for virtualization.
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, consider restricting access to the Xen hypervisor to trusted users only, thereby minimizing the risk of exploitation until the package can be updated to the patched version.
Conclusion
The vulnerability CVE-2017-10917 in the Xen package poses a critical risk to systems utilizing this hypervisor. Immediate action is required to update to the patched version to mitigate the risks associated with denial of service and potential information leakage. Regular monitoring and vulnerability assessments are essential to maintain system security.
See every vulnerability recorded for xen →
FAQ
CVE-2017-10917 is a critical vulnerability in the Xen hypervisor that allows guest OS users to cause a denial of service or potentially access sensitive information.
The CVSS score for this vulnerability is 9.1, indicating a critical severity level that requires immediate attention.
Xen versions up to 4.8.x are affected by this vulnerability. Users should upgrade to version 4.9.0-r0 or later.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected without needing to sign up.
Exploitation of this vulnerability can lead to denial of service, causing the host OS to crash, and may also result in the exposure of sensitive information.
References
Related vulnerabilities
Recent vulnerabilities recorded for xen.
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