Critical Denial of Service Vulnerability in Xen Package
Summary
ALPINE-CVE-2020-29040: An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error. Affects xen versions < 4.12.4-r0. Fixed in 4.12.4-r0. How to fix ↓
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Background
Xen is a popular open-source hypervisor that enables the creation and management of virtual machines. It is widely used for server virtualization, allowing multiple operating systems to run concurrently on a single physical machine. The Xen package is known for its performance, scalability, and support for various guest operating systems. However, it has been found to be vulnerable to a specific issue that can lead to severe consequences for users running x86 HVM guest operating systems.
Vulnerability Detail
An issue was discovered in Xen through version 4.14.x, allowing x86 HVM guest OS users to cause a denial of service (stack corruption), lead to data leaks, or potentially gain elevated privileges due to an off-by-one error. This vulnerability stems from an incorrect fix for CVE-2020-27671, which means that the underlying problem was not adequately addressed, leaving systems exposed to exploitation. The CVSS score for this vulnerability is 8.8, indicating a high severity level.
How To Fix
Minimum fixed version
4.12.4-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, users may consider isolating affected guest operating systems or limiting their access to sensitive resources until the package can be updated. However, this does not eliminate the vulnerability and is not a permanent solution.
Conclusion
The vulnerability in the Xen package poses significant risks to users running x86 HVM guest operating systems, including potential denial of service and data leaks. It is crucial to update to the patched versions as soon as possible to mitigate these risks. Users are encouraged to utilize tools like Vulert to monitor their applications for vulnerabilities.
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FAQ
The vulnerability is an off-by-one error that can lead to stack corruption, data leaks, or privilege escalation for x86 HVM guest OS users.
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 of this vulnerability is 8.8, indicating a high severity level.
If immediate updates are not possible, consider isolating affected guest OS or limiting their access to sensitive resources as a temporary workaround.
You can visit Vulert at https://vulert.com, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file.
References
Related vulnerabilities
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