CVE-2023-6927: keycloak-core Open Redirect Vulnerability
MODERATECVE-2023-6927 is a MODERATE (CVSS 4.6) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting keycloak-core libraries in the Maven ecosystem. The issue involves open redirect via "form_post.jwt" jarm response mode. Remediation is available by upgrading affected packages to version 23.0.4.
CVE-2023-6927 at a Glance
Security Impact
CVSS: 4.6
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N).
How to Fix CVE-2023-6927
To remediate this vulnerability, upgrade all affected keycloak-core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.keycloak</groupId>
<artifactId>keycloak-core</artifactId>
<version>23.0.4</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.keycloakHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2023-6927, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.keycloakAnalyze the terminal output to locate any version of keycloak-core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 23.0.4), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.keycloak command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In keycloak-core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2023-6927 Affected keycloak-core Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-core
|
Maven |
< 23.0.4
|
23.0.4
|
References
Frequently Asked Questions
What is CVE-2023-6927?
Which keycloak-core versions are affected?
What version fixes CVE-2023-6927?
Is keycloak-core affected?
What is the CVSS score of CVE-2023-6927?
What CWE is associated with CVE-2023-6927?
How can I check Maven dependencies for CVE-2023-6927?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9vm7-v8wj-3fqw",
"modified" : "2024-12-26T15:09:05Z",
"published" : "2024-01-23T14:43:50Z",
"aliases" : [ "CVE-2023-6927" ],
"summary" : "keycloak-core: open redirect via \"form_post.jwt\" JARM response mode",
"details" : "An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode \"form_post.jwt\". It is observed that changing the response_mode parameter in the original proof of concept from \"form_post\" to \"form_post.jwt\" can bypass the security patch implemented to address CVE-2023-6134.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "23.0.4"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-9vm7-v8wj-3fqw"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6927"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0094"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0095"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0096"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0097"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0098"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0100"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2024:0101"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2023-6927"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2255027"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-601" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2024-01-23T14:43:50Z",
"nvd_published_at" : null
}
}