title: Symlink Exchange Can Allow Host Filesystem Access
description: A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.
problem types: CWE-20: Improper Input Validation
affected:
{
product: Kubernetes
vendor: Kubernetes
versions:
lessThanOrEqual: 1.19.14, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.20.10, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.21.4, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.22.1, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.8
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]