A vulnerability classified as critical was found in Kubernetes up to 1.1-1.12/1.13.10/1.14.6/1.15.3 (Virtualization Software). Affected by this vulnerability is some unknown processing of the component kubectl cp Command. The manipulation with an unknown input leads to a symlink vulnerability. The CWE definition for the vulnerability is CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Kubernetes kubectl cp command in versions 1.1-1.12, and versions prior to 1.13.11, 1.14.7, and 1.15.4 allows a combination of two symlinks provided by tar output of a malicious container to place a file outside of the destination directory specified in the kubectl cp invocation. This could be used to allow an attacker to place a nefarious file using a symlink, outside of the destination tree.

The weakness was disclosed 02/03/2020 (Website). The advisory is shared at groups.google.com. This vulnerability is known as CVE-2019-11251 since 04/17/2019. The exploitation appears to be difficult. The attack can be launched remotely. Required for exploitation is a single authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.13.11, 1.14.7 or 1.15.4 eliminates this vulnerability.

Productinfo

Type

• Virtualization Software

Name

• Kubernetes

Version

• 1.1-1.0
• 1.1-1.1
• 1.1-1.2
• 1.1-1.3
• 1.1-1.4
• 1.1-1.5
• 1.1-1.6
• 1.1-1.7
• 1.1-1.8
• 1.1-1.9
• 1.1-1.10
• 1.1-1.11
• 1.1-1.12
• 1.13.0
• 1.13.1
• 1.13.2
• 1.13.3
• 1.13.4
• 1.13.5
• 1.13.6
• 1.13.7
• 1.13.8
• 1.13.9
• 1.13.10
• 1.14.0
• 1.14.1
• 1.14.2
• 1.14.3
• 1.14.4
• 1.14.5
• 1.14.6
• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3

License

• open-source

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