CVE-2019-1002101 – kubectl cp path traversal

https://notcve.org/view.php?id=CVE-2019-1002101

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. • https://github.com/brompwnie/CVE-2019-1002101-Helpers http://www.openwall.com/lists/oss-security/2019/06/21/1 http://www.openwall.com/lists/oss-security/2019/08/05/5 http://www.securityfocus.com/bid/107652 https://access.redhat.com/errata/RHBA-2019:0619 https://access.redhat.com/errata/RHBA-2019:0620 https://access.redhat.com/errata/RHBA-2019:0636 https://access.redhat.com/security/cve/cve-2019-1002101 https://github.com/kubernetes/kubernetes/pull/75037 https:/&#x • CWE-59: Improper Link Resolution Before File Access ('Link Following') •