CVE-2021-26715: Openid connect server Openid-connect-server Vulnerability

HIGH
Advisory Identifier: GHSA-792r-mh2q-p8qp
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CVSS 9.1
CWE-918
Published
Advisory Summary

CVE-2021-26715 is a HIGH (CVSS 9.1) openid-connect-server vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Openid connect server libraries in the Maven ecosystem. The issue involves openid-connect-server. Remediation is available in the latest vendor maintenance releases.

CVE-2021-26715 at a Glance

CVE Identifier CVE-2021-26715
GHSA Identifier GHSA-792r-mh2q-p8qp
Severity HIGH
CVSS v3.1 Base Score 9.1
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Openid connect server
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2021-26715

To remediate this vulnerability, upgrade all affected Openid connect server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.mitre:openid-connect-server fixed: Latest secure release 
<dependency>
    <groupId>org.mitre</groupId>
    <artifactId>openid-connect-server</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.mitre

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-26715, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.mitre

Analyze the terminal output to locate any version of Openid connect server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.mitre 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Openid connect server, 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

The OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Server Side Request Forgery (SSRF) vulnerability. The vulnerability arises due to unsafe usage of the logo_uri parameter in the Dynamic Client Registration request. An unauthenticated attacker can make a HTTP request from the vulnerable server to any address in the internal network and obtain its response (which might, for example, have a JavaScript payload for resultant XSS). The issue can be exploited to bypass network boundaries, obtain sensitive data, or attack other hosts in the internal network.

CVE-2021-26715 Affected Openid connect server Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.mitre:openid-connect-server
maven/org.mitre/openid-connect-server
Maven
≤ 1.3.3

References

NVD — CVE-2021-26715 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26715
Openid connect server Source Repository REPOSITORY
https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/releases
portswigger.net/research/hidden-oau... WEB
https://portswigger.net/research/hidden-oauth-attack-vectors

Frequently Asked Questions

What is CVE-2021-26715?
CVE-2021-26715 is a security vulnerability in Openid connect server involving openid-connect-server under CWE-918: Server-Side Request Forgery (SSRF).
Which Openid connect server versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.mitre:openid-connect-server.
What version fixes CVE-2021-26715?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is openid-connect-server affected?
Yes, org.mitre:openid-connect-server is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2021-26715?
CVE-2021-26715 has a CVSS v3.1 base score of 9.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2021-26715?
CVE-2021-26715 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Maven dependencies for CVE-2021-26715?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.mitre'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-792r-mh2q-p8qp",
  "modified" : "2021-03-31T23:22:17Z",
  "published" : "2021-05-13T22:30:52Z",
  "aliases" : [ "CVE-2021-26715" ],
  "summary" : "Server Side Request Forgery (SSRF) in org.mitre:openid-connect-server",
  "details" : "The OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Server Side Request Forgery (SSRF) vulnerability. The vulnerability arises due to unsafe usage of the logo_uri parameter in the Dynamic Client Registration request. An unauthenticated attacker can make a HTTP request from the vulnerable server to any address in the internal network and obtain its response (which might, for example, have a JavaScript payload for resultant XSS). The issue can be exploited to bypass network boundaries, obtain sensitive data, or attack other hosts in the internal network.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.mitre:openid-connect-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26715"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/releases"
  }, {
    "type" : "WEB",
    "url" : "https://portswigger.net/research/hidden-oauth-attack-vectors"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-26T18:51:24Z",
    "nvd_published_at" : "2021-03-25T09:15:00Z"
  }
}