CVE-2021-21675: Requests CSRF Vulnerabilities Vulnerability

MODERATE
Advisory Identifier: GHSA-5frh-wx6v-8m2r
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CVSS 6.5
CWE-352
Published
Advisory Summary

CVE-2021-21675 is a MODERATE (CVSS 6.5) csrf vulnerabilities vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Requests libraries in the Maven ecosystem. The issue involves csrf vulnerabilities in jenkins requests-plugin plugin. Remediation is available by upgrading affected packages to version 2.2.13.

CVE-2021-21675 at a Glance

CVE Identifier CVE-2021-21675
GHSA Identifier GHSA-5frh-wx6v-8m2r
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Requests
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:R/S:U/C:N/I:H/A:N).

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

How to Fix CVE-2021-21675

To remediate this vulnerability, upgrade all affected Requests 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.jenkins-ci.plugins:requests fixed: 2.2.13 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>requests</artifactId>
    <version>2.2.13</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.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-21675, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Requests in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.13), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Requests, 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

Jenkins requests-plugin Plugin 2.2.12 and earlier does not require POST requests to request and apply changes, resulting in cross-site request forgery (CSRF) vulnerabilities. These vulnerabilities allow attackers to create requests and/or have administrators apply pending requests, like renaming or deleting jobs, deleting builds, etc. Jenkins requests-plugin Plugin 2.2.13 requires POST requests for the affected HTTP endpoints. This was partially fixed in requests-plugin Plugin 2.2.8 to require POST requests for some of the affected HTTP endpoints, but the endpoint allowing administrators to apply pending requests remained unprotected until 2.2.13.

CVE-2021-21675 Affected Requests Versions

1 component(s)
Fixed Versions:
2.2.13
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:requests
maven/org.jenkins-ci.plugins/requests
Maven
< 2.2.13
2.2.13

References

NVD — CVE-2021-21675 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21675
Requests Source Repository REPOSITORY
https://github.com/jenkinsci/requests-plugin
Requests Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2136%20(1)
Requests Security Information SECURITY
http://www.openwall.com/lists/oss-security/2021/06/30/1

Frequently Asked Questions

What is CVE-2021-21675?
CVE-2021-21675 is a security vulnerability in Requests involving CSRF vulnerabilities in Jenkins requests-plugin Plugin under CWE-352: Cross-Site Request Forgery (CSRF).
Which Requests versions are affected?
Affected versions include releases prior to 2.2.13 across affected packages: org.jenkins-ci.plugins:requests.
What version fixes CVE-2021-21675?
Upgrading to 2.2.13 (or the latest patched release for your respective branch) resolves the vulnerability.
Is requests affected?
Yes, org.jenkins-ci.plugins:requests is affected in releases prior to 2.2.13. Upgrade your dependency to 2.2.13 or later.
What is the CVSS score of CVE-2021-21675?
CVE-2021-21675 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2021-21675?
CVE-2021-21675 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Maven dependencies for CVE-2021-21675?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. 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-5frh-wx6v-8m2r",
  "modified" : "2023-10-27T15:34:45Z",
  "published" : "2022-05-24T19:06:36Z",
  "aliases" : [ "CVE-2021-21675" ],
  "summary" : "CSRF vulnerabilities in Jenkins requests-plugin Plugin",
  "details" : "Jenkins requests-plugin Plugin 2.2.12 and earlier does not require POST requests to request and apply changes, resulting in cross-site request forgery (CSRF) vulnerabilities.\n\nThese vulnerabilities allow attackers to create requests and/or have administrators apply pending requests, like renaming or deleting jobs, deleting builds, etc.\n\nJenkins requests-plugin Plugin 2.2.13 requires POST requests for the affected HTTP endpoints. This was partially fixed in requests-plugin Plugin 2.2.8 to require POST requests for some of the affected HTTP endpoints, but the endpoint allowing administrators to apply pending requests remained unprotected until 2.2.13.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:requests"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.13"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.2.12"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21675"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/requests-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2136%20(1)"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/06/30/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-16T15:17:26Z",
    "nvd_published_at" : "2021-06-30T17:15:00Z"
  }
}