CVE-2019-1002101

Description

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.

Product status

Credits

Ariel Zelivansky of Twistlock

References

https://github.com/kubernetes/kubernetes/pull/75037

http://www.securityfocus.com/bid/107652 (107652) vdb-entry

https://access.redhat.com/errata/RHBA-2019:0620 (RHBA-2019:0620) vendor-advisory

https://access.redhat.com/errata/RHBA-2019:0619 (RHBA-2019:0619) vendor-advisory

https://access.redhat.com/errata/RHBA-2019:0636 (RHBA-2019:0636) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPV2RE5RMOGUVP5WJMXKQJZUBBLAFZPZ/ (FEDORA-2019-bf800b1c04) vendor-advisory

http://www.openwall.com/lists/oss-security/2019/06/21/1 ([oss-security] 20190620 [ANNOUNCE] Incomplete fixes for CVE-2019-1002101, kubectl cp potential directory traversal - CVE-2019-11246) mailing-list

http://www.openwall.com/lists/oss-security/2019/08/05/5 ([oss-security] 20190805 Kubernetes v1.13.9, v1.14.5, v1.15.2 released to address CVE-2019-11247, CVE-2019-11249) mailing-list

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QZB7E3DOZ5WDG46XAIU6K32CXHXPXB2F/ (FEDORA-2019-2b8ef08c95) vendor-advisory

https://www.twistlock.com/labs-blog/disclosing-directory-traversal-vulnerability-kubernetes-copy-cve-2019-1002101/

cve.org CVE-2019-1002101

nvd.nist.gov CVE-2019-1002101

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