Path Traversal in Linuxfoundation Container Network Interface
CVE-2021-20206
An improper limitation of path name flaw was found in containernetworking/cni in versions before 0.8.1. When specifying the plugin to load in the 'type' field in the network configuration, it is possible to use special elements such as "../" separators to reference binaries elsewhere on the system. This flaw allows an attacker to execute other existing binaries other than the cni plugins/types, such as 'reboot'. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.015 (72.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linuxfoundation Container_network_interface
- N/a Containernetworking-cni — versions containernetworking/cni 0.8.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-20206?
- CVE-2021-20206 is a high-severity vulnerability in Linuxfoundation Container Network Interface, classified under Improper Input Validation. CVSS score: 7.2/10. Published 2021-03-26.
- How severe is CVE-2021-20206?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2021-20206 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.