Race Condition Vulnerability in libvirt: Stack Use-After-Free Flaw
Summary
DEBIAN-CVE-2024-4418: A race condition leading to a stack use-after-free flaw was found in libvirt. Affects libvirt versions < 10.3.0-1. Fixed in 10.3.0-1. How to fix ↓
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Background
libvirt is an open-source API, daemon, and management tool for managing platform virtualization. It provides a consistent and stable interface for managing various virtualization technologies, including KVM, QEMU, and Xen. The package is widely used in cloud computing and virtualization environments. However, a recent vulnerability has been identified that could potentially allow unauthorized access to the virtproxyd daemon, compromising the security of systems using libvirt.
Vulnerability Detail
A race condition leading to a stack use-after-free flaw was discovered in libvirt. This issue arises from a faulty assumption in the virNetClientIOEventLoop() method, where a pointer to a stack-allocated virNetClientIOEventData structure is used in the virNetClientIOEventFD callback while the stack frame is concurrently being freed. This vulnerability allows a local, unprivileged user to access virtproxyd without authentication, potentially escaping their limited access rights. Remote users would still need to authenticate to access the service.
How To Fix
Minimum fixed version
10.3.0-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libvirtTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider restricting access to the virtproxyd daemon by implementing stricter access controls or disabling it until the package can be updated. This can be done by modifying the configuration files associated with libvirt to limit user permissions.
Conclusion
The identified race condition vulnerability in libvirt poses a significant risk by allowing unauthorized access to the virtproxyd daemon. It is crucial for users to update to the patched version 10.3.0-1 to secure their systems. Additionally, utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
The vulnerability is a race condition that leads to a stack use-after-free flaw, potentially allowing unauthorized access to the virtproxyd daemon.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.
If exploited, this vulnerability could allow local, unprivileged users to access sensitive services without authentication, leading to possible data breaches or unauthorized actions.
Yes, the vulnerability has been addressed in the libvirt package version 10.3.0-1. Updating to this version will fix the issue.
If an immediate update is not possible, implement stricter access controls on the virtproxyd daemon or disable it temporarily to mitigate risks.
References
Related vulnerabilities
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