CVE-2020-11476: Concrete5/concrete5 Unrestricted Uploads Vulnerability

HIGH
Advisory Identifier: GHSA-hf9p-9r39-r2h3
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CVSS 7.2
CWE-434
Published
Advisory Summary

CVE-2020-11476 is a HIGH (CVSS 7.2) unrestricted uploads vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Concrete5/concrete5 libraries in the Packagist ecosystem. The issue involves unrestricted uploads in concrete5. Remediation is available by upgrading affected packages to version 8.5.3.

CVE-2020-11476 at a Glance

CVE Identifier CVE-2020-11476
GHSA Identifier GHSA-hf9p-9r39-r2h3
Severity HIGH
CVSS v3.1 Base Score 7.2
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Concrete5/concrete5
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.2

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2020-11476

To remediate this vulnerability, upgrade all affected Concrete5/concrete5 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

concrete5/concrete5 fixed: 8.5.3 
Upgrade concrete5/concrete5 to 8.5.3
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 concrete5/concrete5

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-11476, inspect your project dependencies for Concrete5/concrete5:

inspect dependencies for concrete5/concrete5

Analyze the terminal output to locate any version of Concrete5/concrete5 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.5.3), 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 Concrete5/concrete5, 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

Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.

CVE-2020-11476 Affected Concrete5/concrete5 Versions

1 component(s)
Fixed Versions:
8.5.3
Product / Package Ecosystem Affected Versions Fixed Version
concrete5/concrete5
 Packagist
< 8.5.3
8.5.3

References

NVD — CVE-2020-11476 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-11476
Concrete5/concrete5 Source Repository REPOSITORY
https://github.com/concrete5/concrete5/pull/8713
Security Fix Commit FIX COMMIT
https://github.com/concretecms/concretecms/commit/d296f4ba4f6ad94b199c21c1b16f0d185adab343
Concrete5/concrete5 Source Repository REPOSITORY
https://github.com/concrete5/concrete5
Concrete5/concrete5 Release RELEASE
https://github.com/concrete5/concrete5/releases/tag/8.5.3
Concrete5/concrete5 Security Information SECURITY
https://herolab.usd.de/security-advisories/usd-2020-0041

Frequently Asked Questions

What is CVE-2020-11476?
CVE-2020-11476 is a security vulnerability in Concrete5/concrete5 involving Unrestricted Uploads in Concrete5 under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Concrete5/concrete5 versions are affected?
Affected versions include releases prior to 8.5.3 across affected packages: concrete5/concrete5.
What version fixes CVE-2020-11476?
Upgrading to 8.5.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is concrete5/concrete5 affected?
Yes, concrete5/concrete5 is affected in releases prior to 8.5.3. Upgrade your dependency to 8.5.3 or later.
What is the CVSS score of CVE-2020-11476?
CVE-2020-11476 has a CVSS v3.1 base score of 7.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-11476?
CVE-2020-11476 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-2020-11476?
Run the dependency tree command: 'inspect dependencies for concrete5/concrete5'. 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-hf9p-9r39-r2h3",
  "modified" : "2021-11-02T18:39:03Z",
  "published" : "2021-11-03T17:29:29Z",
  "aliases" : [ "CVE-2020-11476" ],
  "summary" : "Unrestricted Uploads in Concrete5",
  "details" : "Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "concrete5/concrete5"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.5.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-11476"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/concrete5/concrete5/pull/8713"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/concretecms/concretecms/commit/d296f4ba4f6ad94b199c21c1b16f0d185adab343"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/concrete5/concrete5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/concrete5/concrete5/releases/tag/8.5.3"
  }, {
    "type" : "WEB",
    "url" : "https://herolab.usd.de/security-advisories/usd-2020-0041"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-02T18:39:03Z",
    "nvd_published_at" : "2020-07-28T21:15:00Z"
  }
}