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Temporary Directory Hijacking Vulnerability in Keycloak

High severity GitHub Reviewed Published Mar 18, 2022 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

maven org.keycloak:keycloak-core (Maven)

Affected versions

< 13.0.0

Patched versions

13.0.0

Description

A flaw was found in keycloak. Directories can be created prior to the Java process creating them in the temporary directory, but with wider user permissions, allowing the attacker to have access to the contents that keycloak stores in this directory. The highest threat from this vulnerability is to data confidentiality and integrity.

References

Published by the National Vulnerability Database May 12, 2021
Reviewed May 17, 2021
Published to the GitHub Advisory Database Mar 18, 2022
Last updated Feb 1, 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

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

EPSS score

0.044%
(14th percentile)

Weaknesses

CVE ID

CVE-2021-20202

GHSA ID

GHSA-6xp6-fmc8-pmmr

Source code

No known source code

Credits

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