Denial-of-Service Vulnerability in Xen
Summary
CVE-2018-15469: An issue was discovered in Xen through 4.11.x. Affects xen versions < 4.11.1-r0. Fixed in 4.11.1-r0. How to fix ↓
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Background
Xen is an open-source hypervisor that allows multiple operating systems to run on a single host machine. It provides virtualization capabilities and is widely used in cloud computing environments. However, a vulnerability has been discovered in Xen that can lead to a denial-of-service (DoS) attack.
Vulnerability Detail
The vulnerability, identified as CVE-2018-15469, affects Xen versions up to 4.11.x. It specifically impacts ARM architecture, as ARM never properly implemented grant table v2. This means that an ARM guest can request v2 grant tables, but they will not be set up correctly. As a result, subsequent grant-related hypercalls can trigger a BUG() check in the hypervisor, leading to a crash and a DoS condition. An unprivileged guest can exploit this vulnerability to cause the hypervisor to crash, disrupting the operation of the virtualized environment.
How To Fix
Minimum fixed version
4.11.1-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
No specific workaround has been provided for this vulnerability. It is essential to update Xen to the fixed version to ensure the proper functioning of the hypervisor and prevent potential DoS attacks.
Conclusion
The vulnerability in Xen can lead to a denial-of-service attack by causing the hypervisor to crash. To mitigate this risk, it is crucial to update Xen to version 4.11.1-r0 or later. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for xen →
FAQ
Xen is an open-source hypervisor that enables virtualization and allows multiple operating systems to run on a single host machine.
The vulnerability can be exploited by an unprivileged guest to cause a denial-of-service (DoS) attack, resulting in the hypervisor crashing and disrupting the virtualized environment.
Xen versions up to 4.11.x are affected by this vulnerability.
To fix this vulnerability, update Xen to version 4.11.1-r0 or later, which addresses the grant table v2 implementation issue.
No specific workaround has been provided. It is recommended to update Xen to the fixed version.
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