GoogleOSV:GHSA-34JX-WX69-9X8VSymlink Attack in kubectl cp
EPSS
Percentile
47.8%
The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.
References
www.openwall.com/lists/oss-security/2019/06/21/1
www.openwall.com/lists/oss-security/2019/08/05/5
www.securityfocus.com/bid/107652
access.redhat.com/errata/RHBA-2019:0619
access.redhat.com/errata/RHBA-2019:0620
access.redhat.com/errata/RHBA-2019:0636
github.com/kubernetes/kubernetes/commit/47063891dd782835170f500a83f37cc98c3c1013
github.com/kubernetes/kubernetes/pull/75037
lists.fedoraproject.org/archives/list/[email protected]/message/BPV2RE5RMOGUVP5WJMXKQJZUBBLAFZPZ
lists.fedoraproject.org/archives/list/[email protected]/message/QZB7E3DOZ5WDG46XAIU6K32CXHXPXB2F
nvd.nist.gov/vuln/detail/CVE-2019-1002101
www.twistlock.com/labs-blog/disclosing-directory-traversal-vulnerability-kubernetes-copy-cve-2019-1002101
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