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Rancher Recreates Default User With Known Password Despite Deletion

Critical severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Jun 10, 2024

Package

gomod github.com/rancher/rancher (Go)

Affected versions

>= 2.0.0, <= 2.0.13
>= 2.1.0, <= 2.1.8
>= 2.2.0, < 2.2.2

Patched versions

2.2.2

Description

An issue was discovered that affects the following versions of Rancher: v2.0.0 through v2.0.13, v2.1.0 through v2.1.8, and v2.2.0 through 2.2.1. When Rancher starts for the first time, it creates a default admin user with a well-known password. After initial setup, the Rancher administrator may choose to delete this default admin user. If Rancher is restarted, the default admin user will be recreated with the well-known default password. An attacker could exploit this by logging in with the default admin credentials. This can be mitigated by deactivating the default admin user rather than completing deleting them.

References

Published by the National Vulnerability Database Jul 30, 2019
Published to the GitHub Advisory Database May 24, 2022
Reviewed Apr 24, 2024
Last updated Jun 10, 2024

Severity

Critical

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
None
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.341%
(72nd percentile)

Weaknesses

CVE ID

CVE-2019-11202

GHSA ID

GHSA-xh8x-j8h3-m5ph

Source code

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