Denial of Service and Privilege Escalation in Xen
Summary
CVE-2017-15590: An issue was discovered in Xen through 4.9.x allowing x86 guest OS users to cause a denial of service (hypervisor crash) or possibly gain privileges because MSI mapping was mishandled. Affects xen versions < 4.9.0-r6. Fixed in 4.9.0-r6. How to fix ↓
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Background
Xen is an open-source hypervisor that provides virtualization capabilities for x86 systems. It allows multiple guest operating systems to run on a single host machine, enabling efficient resource utilization. However, a vulnerability has been discovered in Xen that can lead to a denial of service (DoS) attack or potential privilege escalation for x86 guest OS users. This vulnerability arises due to mishandling of MSI mapping.
Vulnerability Detail
The vulnerability, identified as CVE-2017-15590, allows malicious x86 guest OS users to exploit the MSI mapping mishandling in Xen. By exploiting this vulnerability, an attacker can cause a hypervisor crash, resulting in a denial of service. Additionally, there is a possibility of privilege escalation, which could allow the attacker to gain elevated privileges within the virtualized environment. The severity of this vulnerability is rated as CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H with a score of 8.8.
How To Fix
Minimum fixed version
4.9.0-r6
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
There is no specific workaround mentioned for this vulnerability. However, it is advised to apply the recommended fix by updating the Xen package to the latest version.
Conclusion
In conclusion, the vulnerability in Xen allows x86 guest OS users to cause a denial of service or potentially gain elevated privileges. It is crucial to update the Xen package to the latest version to mitigate this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
See every vulnerability recorded for xen →
FAQ
Xen is an open-source hypervisor that provides virtualization capabilities for x86 systems. It allows multiple guest operating systems to run on a single host machine.
This vulnerability can lead to a denial of service (DoS) attack, causing a hypervisor crash. It also has the potential for privilege escalation, allowing attackers to gain elevated privileges within the virtualized environment.
To fix this vulnerability, update the Xen package to version 4.9.0-r6 or later. Regularly updating the Xen package is essential to ensure the latest security patches are applied.
There is no specific workaround mentioned for this vulnerability. It is recommended to apply the recommended fix by updating the Xen package.
The severity of this vulnerability is rated as CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H with a score of 8.8.
References
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