Link Following Affecting kubeadm package, versions <0:1.12.10-1.0.10.el7


Severity

Recommended
high

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.05% (20th percentile)

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  • Snyk ID SNYK-ORACLE7-KUBEADM-2547618
  • published 10 Apr 2022
  • disclosed 3 Feb 2020

How to fix?

Upgrade Oracle:7 kubeadm to version 0:1.12.10-1.0.10.el7 or higher.
This issue was patched in ELSA-2019-4816.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kubeadm package and not the kubeadm package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

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.

CVSS Scores

version 3.1
Expand this section

NVD

5.7 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    Required
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    High
  • Availability (A)
    None