CVE-2023-30840 – On a compromised node, the fluid-csi service account can be used to modify node specs

https://notcve.org/view.php?id=CVE-2023-30840

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. • https://github.com/fluid-cloudnative/fluid/commit/77c8110a3d1ec077ae2bce6bd88d296505db1550 https://github.com/fluid-cloudnative/fluid/commit/91c05c32db131997b5ca065e869c9918a125c149 https://github.com/fluid-cloudnative/fluid/releases/tag/v0.8.6 https://github.com/fluid-cloudnative/fluid/security/advisories/GHSA-93xx-cvmc-9w3v • CWE-863: Incorrect Authorization •