A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-14655 from the MITRE CVE dictionary dictionary and NIST NVD.
| CVSS3 Base Score | 4.6 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | None |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Single Sign-On 7.1 for RHEL 7 Server (rh-sso7-keycloak) | RHSA-2018:3593 | 2018-11-13 |
| Red Hat Single Sign-On 7.2 | RHSA-2018:3595 | 2018-11-13 |
| Red Hat Single Sign-On 7.1 for RHEL 6 Server (rh-sso7-keycloak) | RHSA-2018:3592 | 2018-11-13 |
| Platform | Package | State |
|---|---|---|
| Red Hat Single Sign-On 7 | keycloak | Affected |
| Red Hat Mobile Application Platform On-Premise 4 | keycloak | Under investigation |
| Red Hat JBoss Fuse 7 | keycloak | Under investigation |
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