Fluid up to 0.8.5 fluid-csi authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in Fluid up to 0.8.5. This affects an unknown function of the component fluid-csi. Such manipulation leads to authorization. This vulnerability is documented as CVE-2023-30840. The attack needs to be performed locally. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Fluid up to 0.8.5 and classified as problematic. Affected by this issue is an unknown functionality of the component fluid-csi. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Fluid is an open source Kubernetes-native distributed dataset orchestrator and accelerator for data-intensive applications. Starting in version 0.7.0 and prior to version 0.8.6, if a malicious user gains control of a Kubernetes node running fluid csi pod (controlled by the `csi-nodeplugin-fluid` node-daemonset), they can leverage the fluid-csi service account to modify specs of all the nodes in the cluster. However, since this service account lacks `list node` permissions, the attacker may need to use other techniques to identify vulnerable nodes. Once the attacker identifies and modifies the node specs, they can manipulate system-level-privileged components to access all secrets in the cluster or execute pods on other nodes. This allows them to elevate privileges beyond the compromised node and potentially gain full privileged access to the whole cluster. To exploit this vulnerability, the attacker can make all other nodes unschedulable (for example, patch node with taints) and wait for system-critical components with high privilege to appear on the compromised node. However, this attack requires two prerequisites: a compromised node and identifying all vulnerable nodes through other means. Version 0.8.6 contains a patch for this issue. As a workaround, delete the `csi-nodeplugin-fluid` daemonset in `fluid-system` namespace and avoid using CSI mode to mount FUSE file systems. Alternatively, using sidecar mode to mount FUSE file systems is recommended.

The weakness was released 05/08/2023 as GHSA-93xx-cvmc-9w3v. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-30840 since 04/18/2023. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.8.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 77c8110a3d1ec077ae2bce6bd88d296505db1550 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Fluid

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5

License

• open-source

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• 🔍
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CPE 2.2info

• 🔍
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Once again VulDB remains the best source for vulnerability data.

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