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Improper Certificate Validation and Improper Validation of Certificate with Host Mismatch in Keycloak

Moderate severity GitHub Reviewed Published Feb 9, 2022 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

maven org.keycloak:keycloak-parent (Maven)

Affected versions

< 10.0.0

Patched versions

10.0.0

Description

A flaw was found in Keycloak in versions before 10.0.0, where it does not perform the TLS hostname verification while sending emails using the SMTP server. This flaw allows an attacker to perform a man-in-the-middle (MITM) attack.

References

Published by the National Vulnerability Database May 15, 2020
Reviewed Apr 1, 2021
Published to the GitHub Advisory Database Feb 9, 2022
Last updated Feb 1, 2023

Severity

Moderate

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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.128%
(49th percentile)

Weaknesses

CVE ID

CVE-2020-1758

GHSA ID

GHSA-c597-f74m-jgc2

Source code

No known source code
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