Privilege Escalation Vulnerability in Xen Package - CVE-2017-12137
Summary
ALPINE-CVE-2017-12137: arch/x86/mm.c in Xen allows local PV guest OS users to gain host OS privileges via vectors related to map_grant_ref. Affects xen versions < 4.9.0-r1. Fixed in 4.9.0-r1. How to fix ↓
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Background
Xen is a popular open-source hypervisor that allows multiple operating systems to run on a single physical machine. It provides virtualization capabilities, enabling efficient resource management and isolation between virtual machines. However, the Xen package has been found to have a critical vulnerability that could allow local users to gain unauthorized access to host OS privileges.
Vulnerability Detail
The vulnerability, identified as CVE-2017-12137, exists in the arch/x86/mm.c file of the Xen hypervisor. It allows local paravirtualized (PV) guest OS users to escalate their privileges to that of the host operating system. This could lead to severe security implications, including unauthorized access to sensitive data and control over the host system. The vulnerability arises from improper handling of memory mappings related to grant references, which can be exploited by malicious users within the guest OS.
How To Fix
Minimum fixed version
4.9.0-r1
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, you can limit access to the Xen hypervisor by restricting user permissions and ensuring that only trusted users have access to the guest OS. Additionally, consider disabling paravirtualization for sensitive workloads until the package is updated.
Conclusion
The CVE-2017-12137 vulnerability in the Xen package poses a significant risk by allowing local users to escalate privileges to the host OS. It is crucial to update to the patched version 4.9.0-r1 to mitigate this risk. Users should also consider implementing workarounds until the update can be applied.
See every vulnerability recorded for xen →
FAQ
CVE-2017-12137 is a vulnerability in the Xen hypervisor that allows local users of paravirtualized guest operating systems to escalate their privileges to the host OS.
The vulnerability has a CVSS score of 8.8, indicating a high severity level that could lead to significant security risks.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
If an immediate update is not possible, consider implementing user access restrictions and disabling paravirtualization for sensitive workloads as a temporary measure.
More information about CVE-2017-12137 can be found in the official CVE database and security advisories related to the Xen hypervisor.
References
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