CVE-2021-40822: Gs main GeoServer Allows SSRF Vulnerability

HIGH
Advisory Identifier: GHSA-rr33-j5p5-ppf8
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CVSS 7.5
CWE-918
Published
Advisory Summary

CVE-2021-40822 is a HIGH (CVSS 7.5) geoserver allows ssrf vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Gs main libraries in the Maven ecosystem. The issue involves geoserver allows ssrf via the option for setting a proxy host. Remediation is available in the latest vendor maintenance releases.

CVE-2021-40822 at a Glance

CVE Identifier CVE-2021-40822
GHSA Identifier GHSA-rr33-j5p5-ppf8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Gs main
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/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 None (I:N)
Availability None (A:N)

How to Fix CVE-2021-40822

To remediate this vulnerability, upgrade all affected Gs main 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.geoserver:gs-main fixed: Latest secure release 
<dependency>
    <groupId>org.geoserver</groupId>
    <artifactId>gs-main</artifactId>
    <version>Latest secure release</version>
</dependency>
org.geoserver:gs-main fixed: Latest secure release 
<dependency>
    <groupId>org.geoserver</groupId>
    <artifactId>gs-main</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.geoserver

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-40822, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.geoserver

Analyze the terminal output to locate any version of Gs main 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.geoserver 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 Gs main, 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

GeoServer through 2.18.5 and 2.19.x through 2.19.2 allows SSRF via the option for setting a proxy host.

CVE-2021-40822 Affected Gs main Versions

2 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.geoserver:gs-main
maven/org.geoserver/gs-main
Maven
≤ 2.18.5
org.geoserver:gs-main
maven/org.geoserver/gs-main
Maven
≥ 2.19.0
≤ 2.19.2

References

NVD — CVE-2021-40822 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-40822
Gs main Source Repository REPOSITORY
https://github.com/geoserver/geoserver
Gs main Source Repository REPOSITORY
https://github.com/geoserver/geoserver/compare/2.19.2...2.19.3
Gs main Source Repository REPOSITORY
https://github.com/geoserver/geoserver/releases
osgeo-org.atlassian.net/browse/geos-10229 WEB
https://osgeo-org.atlassian.net/browse/GEOS-10229
osgeo-org.atlassian.net/browse/geos-10229 WEB
https://osgeo-org.atlassian.net/browse/GEOS-10229?focusedCommentId=83508

Frequently Asked Questions

What is CVE-2021-40822?
CVE-2021-40822 is a security vulnerability in Gs main involving GeoServer allows SSRF via the option for setting a proxy host under CWE-918: Server-Side Request Forgery (SSRF).
Which Gs main versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.geoserver:gs-main.
What version fixes CVE-2021-40822?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is gs-main affected?
Yes, org.geoserver:gs-main 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-2021-40822?
CVE-2021-40822 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-40822?
CVE-2021-40822 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-2021-40822?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.geoserver'. 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-rr33-j5p5-ppf8",
  "modified" : "2022-05-18T19:10:33Z",
  "published" : "2022-05-03T00:00:44Z",
  "aliases" : [ "CVE-2021-40822" ],
  "summary" : "GeoServer allows SSRF via the option for setting a proxy host",
  "details" : "GeoServer through 2.18.5 and 2.19.x through 2.19.2 allows SSRF via the option for setting a proxy host.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.geoserver:gs-main"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.18.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.geoserver:gs-main"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.19.0"
      }, {
        "last_affected" : "2.19.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-40822"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/geoserver/geoserver"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/geoserver/geoserver/compare/2.19.2...2.19.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/geoserver/geoserver/releases"
  }, {
    "type" : "WEB",
    "url" : "https://osgeo-org.atlassian.net/browse/GEOS-10229"
  }, {
    "type" : "WEB",
    "url" : "https://osgeo-org.atlassian.net/browse/GEOS-10229?focusedCommentId=83508"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-05-18T19:10:33Z",
    "nvd_published_at" : "2022-05-02T00:15:00Z"
  }
}