CVE-2021-25976: Piranha Cross-Site Request Forgery Vulnerability

HIGH
Advisory Identifier: GHSA-ppq7-88c7-q879
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CVSS 8.1
CWE-352
Published
Advisory Summary

CVE-2021-25976 is a HIGH (CVSS 8.1) cross-site request forgery vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Piranha libraries in the NuGet ecosystem. The issue involves cross-site request forgery in piranhacms. Remediation is available by upgrading affected packages to version 10.0-alpha1.

CVE-2021-25976 at a Glance

CVE Identifier CVE-2021-25976
GHSA Identifier GHSA-ppq7-88c7-q879
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Piranha
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

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 High (A:H)

How to Fix CVE-2021-25976

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

Piranha fixed: 10.0-alpha1 
Upgrade Piranha to 10.0-alpha1
Verify Direct and Transitive Dependencies

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

inspect dependencies for Piranha

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-25976, inspect your project dependencies for Piranha:

inspect dependencies for Piranha

Analyze the terminal output to locate any version of Piranha in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.0-alpha1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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 Piranha, 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

In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.

CVE-2021-25976 Affected Piranha Versions

1 component(s)
Fixed Versions:
10.0-alpha1
Product / Package Ecosystem Affected Versions Fixed Version
Piranha
nuget/Piranha
NuGet
≥ 4.0.0-alpha1
< 10.0-alpha1
10.0-alpha1

References

NVD — CVE-2021-25976 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25976
Security Fix Commit FIX COMMIT
https://github.com/PiranhaCMS/piranha.core/commit/e42abacdd0dd880ce9cf6607efcc24646ac82eda
Piranha Source Repository REPOSITORY
https://github.com/PiranhaCMS/piranha.core
www.whitesourcesoftware.com/vulnerability-datab... WEB
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25976

Frequently Asked Questions

What is CVE-2021-25976?
CVE-2021-25976 is a security vulnerability in Piranha involving Cross-Site Request Forgery in PiranhaCMS under CWE-352: Cross-Site Request Forgery (CSRF).
Which Piranha versions are affected?
Affected versions include releases prior to 10.0-alpha1 across affected packages: Piranha.
What version fixes CVE-2021-25976?
Upgrading to 10.0-alpha1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Piranha affected?
Yes, Piranha is affected in releases prior to 10.0-alpha1. Upgrade your dependency to 10.0-alpha1 or later.
What is the CVSS score of CVE-2021-25976?
CVE-2021-25976 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2021-25976?
CVE-2021-25976 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 NuGet dependencies for CVE-2021-25976?
Run the dependency tree command: 'inspect dependencies for Piranha'. 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-ppq7-88c7-q879",
  "modified" : "2021-11-17T22:34:48Z",
  "published" : "2021-11-17T23:42:40Z",
  "aliases" : [ "CVE-2021-25976" ],
  "summary" : "Cross-Site Request Forgery in PiranhaCMS",
  "details" : "In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Piranha"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-alpha1"
      }, {
        "fixed" : "10.0-alpha1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 9.2.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-25976"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PiranhaCMS/piranha.core/commit/e42abacdd0dd880ce9cf6607efcc24646ac82eda"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/PiranhaCMS/piranha.core"
  }, {
    "type" : "WEB",
    "url" : "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25976"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-17T22:34:48Z",
    "nvd_published_at" : "2021-11-16T09:15:00Z"
  }
}