CVE-2020-21516: Feehi/cms FeehiCMS Has An Arbitrary File Vulnerability

CRITICAL
Advisory Identifier: GHSA-jj62-mc3m-j769
Share
CVSS 9.8
CWE-434
Published
Advisory Summary

CVE-2020-21516 is a CRITICAL (CVSS 9.8) feehicms has an arbitrary file vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Feehi/cms libraries in the Packagist ecosystem. The issue involves feehicms has an arbitrary file upload vulnerability. Remediation is available by upgrading affected packages to version 2.0.8.1.

CVE-2020-21516 at a Glance

CVE Identifier CVE-2020-21516
GHSA Identifier GHSA-jj62-mc3m-j769
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Feehi/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H).

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 High (A:H)

How to Fix CVE-2020-21516

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

feehi/cms fixed: 2.0.8.1 
Upgrade feehi/cms to 2.0.8.1
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 feehi/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-21516, inspect your project dependencies for Feehi/cms:

inspect dependencies for feehi/cms

Analyze the terminal output to locate any version of Feehi/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.8.1), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Feehi/cms, 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

There is an arbitrary file upload vulnerability in FeehiCMS 2.0.8.1 at the head image upload, that allows attackers to execute relevant PHP code.

CVE-2020-21516 Affected Feehi/cms Versions

1 component(s)
Fixed Versions:
2.0.8.1
Product / Package Ecosystem Affected Versions Fixed Version
feehi/cms
 Packagist
< 2.0.8.1
2.0.8.1

References

NVD — CVE-2020-21516 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-21516
Feehi/cms Source Repository REPOSITORY
https://github.com/liufee/cms/issues/46
Security Fix Commit FIX COMMIT
https://github.com/liufee/cms/commit/ecbfb0ca77874ead5b6e79b96a5e1f94e67475a9
Feehi/cms Source Repository REPOSITORY
https://github.com/liufee/cms
Feehi/cms Release RELEASE
https://github.com/liufee/cms/releases/tag/2.0.8.1

Frequently Asked Questions

What is CVE-2020-21516?
CVE-2020-21516 is a security vulnerability in Feehi/cms involving FeehiCMS has an arbitrary file upload vulnerability under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Feehi/cms versions are affected?
Affected versions include releases prior to 2.0.8.1 across affected packages: feehi/cms.
What version fixes CVE-2020-21516?
Upgrading to 2.0.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is feehi/cms affected?
Yes, feehi/cms is affected in releases prior to 2.0.8.1. Upgrade your dependency to 2.0.8.1 or later.
What is the CVSS score of CVE-2020-21516?
CVE-2020-21516 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-21516?
CVE-2020-21516 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Packagist dependencies for CVE-2020-21516?
Run the dependency tree command: 'inspect dependencies for feehi/cms'. 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-jj62-mc3m-j769",
  "modified" : "2022-09-15T03:30:14Z",
  "published" : "2022-09-07T00:01:50Z",
  "aliases" : [ "CVE-2020-21516" ],
  "summary" : "FeehiCMS has an arbitrary file upload vulnerability",
  "details" : "There is an arbitrary file upload vulnerability in FeehiCMS 2.0.8.1 at the head image upload, that allows attackers to execute relevant PHP code.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "feehi/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-21516"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/liufee/cms/issues/46"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/liufee/cms/commit/ecbfb0ca77874ead5b6e79b96a5e1f94e67475a9"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/liufee/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/liufee/cms/releases/tag/2.0.8.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-09-15T03:30:14Z",
    "nvd_published_at" : "2022-09-06T19:15:00Z"
  }
}