Sensitive Information Disclosure in Xen Package: CVE-2016-9932
Summary
ALPINE-CVE-2016-9932: CMPXCHG8B emulation in Xen 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a "supposedly-ignored" operand size prefix. Affects xen versions < 4.7.1-r3. Fixed in 4.7.1-r3. How to fix ↓
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Background
The Xen package is a popular open-source hypervisor that allows multiple operating systems to run concurrently on a single physical machine. It is widely used in cloud computing and virtualization environments due to its efficiency and flexibility. However, certain versions of Xen are vulnerable to a security issue that can lead to unauthorized access to sensitive information from the host memory.
Vulnerability Detail
CMPXCHG8B emulation in Xen versions 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a 'supposedly-ignored' operand size prefix. This vulnerability can be exploited by malicious users within the guest operating system, potentially leading to data breaches and unauthorized access to critical information.
How To Fix
Minimum fixed version
4.7.1-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 workaround, consider isolating sensitive workloads from untrusted guest operating systems or implementing strict access controls to limit the exposure of sensitive data.
Conclusion
CVE-2016-9932 represents a significant security risk for users of the Xen hypervisor, particularly in environments where sensitive data is processed. It is crucial to update to the patched version to mitigate this vulnerability and protect sensitive information.
See every vulnerability recorded for xen →
FAQ
CVE-2016-9932 is a vulnerability in the Xen hypervisor that allows local users of HVM guest operating systems to access sensitive information from the host's memory.
Xen versions 3.3.x through 4.7.x are affected by this vulnerability.
Exploitation of this vulnerability could lead to unauthorized access to sensitive information, potentially resulting in data breaches.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring signup.
The CVSS score for CVE-2016-9932 is 3.3, indicating a moderate level of severity.
References
Related vulnerabilities
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