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containernetworking/cni improper limitation of path name

High severity GitHub Reviewed Published Feb 15, 2022 to the GitHub Advisory Database • Updated Oct 2, 2023

Package

gomod github.com/containernetworking/cni (Go)

Affected versions

< 0.8.1

Patched versions

0.8.1

Description

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.

Specific Go Packages Affected

github.com/containernetworking/cni/pkg/invoke

References

Published by the National Vulnerability Database Mar 26, 2021
Reviewed May 18, 2021
Published to the GitHub Advisory Database Feb 15, 2022
Last updated Oct 2, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.123%
(48th percentile)

Weaknesses

CVE ID

CVE-2021-20206

GHSA ID

GHSA-xjqr-g762-pxwp

Source code

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