Critical Out-of-Bounds Access Vulnerability in Xen Package
Summary
ALPINE-CVE-2020-14364: An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0. Affects xen versions < 4.12.3-r3. Fixed in 4.12.3-r3. How to fix ↓
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Background
The Xen package is an open-source hypervisor that allows multiple operating systems to run on a single physical machine. It is widely used for virtualization in cloud computing and server environments. The package provides features such as isolation, resource management, and performance optimization. However, it is susceptible to vulnerabilities that can compromise the security and stability of the host system.
Vulnerability Detail
An out-of-bounds read/write access flaw was discovered in the USB emulator of QEMU, affecting versions prior to 5.2.0. This vulnerability arises when processing USB packets from a guest, specifically when the 'setup_len' exceeds the allocated 'data_buf[4096]'. This flaw can lead to a denial of service by crashing the QEMU process or potentially allow arbitrary code execution with the privileges of the QEMU process on the host, posing significant security risks.
How To Fix
Minimum fixed version
4.12.3-r3
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, consider disabling USB emulation in the QEMU configuration to mitigate the risk of exploitation until the package can be updated. This can be done by modifying the QEMU command line options or configuration files to exclude USB devices.
Conclusion
The out-of-bounds access vulnerability in the Xen package poses significant risks to systems running QEMU. It is crucial to update the package to the latest patched version to mitigate these risks. Additionally, utilizing tools like Vulert can help in monitoring for such vulnerabilities effectively.
See every vulnerability recorded for xen →
FAQ
The CVSS score of this vulnerability is 5.0, indicating a medium severity level.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Exploitation of this vulnerability can lead to denial of service or arbitrary code execution, compromising the security of the host system.
Yes, upgrade to version 4.12.3-r3 for Alpine v3.10, 4.13.1-r3 for Alpine v3.11 and v3.12, or 4.13.1-r5 for Alpine v3.13 and later versions.
Vulert is a tool that monitors and alerts in real-time for open-source vulnerabilities in software using just a manifest file like package-lock.json.
References
Related vulnerabilities
Recent vulnerabilities recorded for xen.
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