Denial of Service Vulnerability in Xen Package - CVE-2018-12893
Summary
ALPINE-CVE-2018-12893: An issue was discovered in Xen through 4.10.x. Affects xen versions < 4.11.0-r0. Fixed in 4.11.0-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 environments. The Xen package provides essential functionalities for managing virtual machines, including resource allocation and isolation. However, it has been found to be vulnerable to a specific issue that can lead to system crashes under certain conditions.
Vulnerability Detail
An issue was discovered in Xen through version 4.10.x, where a fix implemented for XSA-260 inadvertently introduced a vulnerability. This flaw allows a malicious paravirtual (PV) guest to trigger safety checks that can crash the Xen hypervisor, resulting in a Denial of Service (DoS). The vulnerability primarily affects x86 systems, as ARM systems are not susceptible. To exploit this vulnerability, an attacker must control hardware debugging facilities, which are typically accessible to unprivileged users.
How To Fix
Minimum fixed version
4.11.0-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
Currently, there are no specific workarounds to mitigate this vulnerability other than applying the patch. Users are advised to monitor their systems for any suspicious activity and limit access to unprivileged users who may exploit the vulnerability.
Conclusion
The CVE-2018-12893 vulnerability in the Xen hypervisor poses a significant risk of Denial of Service attacks on x86 systems. It is crucial for users to update to the patched version to mitigate this risk. Regular monitoring and access control are recommended until the update can be implemented.
See every vulnerability recorded for xen →
FAQ
CVE-2018-12893 is a vulnerability in the Xen hypervisor that can lead to a Denial of Service due to improper handling of debug exceptions by paravirtual guests.
Only x86 systems running vulnerable versions of the Xen hypervisor are affected. ARM systems are not vulnerable.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for CVE-2018-12893 is 6.5, indicating a medium severity level.
If you cannot update the package right away, ensure to limit access to unprivileged users and monitor your systems for any unusual behavior until the update can be applied.
References
Related vulnerabilities
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