CVE-2020-5187: DotNetNuke.Core Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-4qf5-7xc2-wqpg
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CVSS 8.8
CWE-22
Published
Advisory Summary

CVE-2020-5187 is a HIGH (CVSS 8.8) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting DotNetNuke.Core libraries in the NuGet ecosystem. The issue involves dnn path traversal via zip slip. Remediation is available by upgrading affected packages to version 9.5.0.

CVE-2020-5187 at a Glance

CVE Identifier CVE-2020-5187
GHSA Identifier GHSA-4qf5-7xc2-wqpg
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product DotNetNuke.Core
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-5187

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

DotNetNuke.Core fixed: 9.5.0 
Upgrade DotNetNuke.Core to 9.5.0
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 DotNetNuke.Core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-5187, inspect your project dependencies for DotNetNuke.Core:

inspect dependencies for DotNetNuke.Core

Analyze the terminal output to locate any version of DotNetNuke.Core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.5.0), 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In DotNetNuke.Core, 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

DNN (formerly DotNetNuke) through 9.4.4 allows Path Traversal via unsafe handling of zip files

CVE-2020-5187 Affected DotNetNuke.Core Versions

1 component(s)
Fixed Versions:
9.5.0
Product / Package Ecosystem Affected Versions Fixed Version
DotNetNuke.Core
nuget/DotNetNuke.Core
NuGet
< 9.5.0
9.5.0

References

NVD — CVE-2020-5187 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-5187
DotNetNuke.Core Source Repository REPOSITORY
https://github.com/dnnsoftware/Dnn.Platform/releases
medium.com/@sajjadpourali/dnn-... WEB
https://medium.com/@SajjadPourali/dnn-dotnetnuke-cms-not-as-secure-as-you-think-e8516f789175
DotNetNuke.Core Security Information SECURITY
http://packetstormsecurity.com/files/156489/DotNetNuke-CMS-9.4.4-Zip-Directory-Traversal.html

Frequently Asked Questions

What is CVE-2020-5187?
CVE-2020-5187 is a security vulnerability in DotNetNuke.Core involving DNN Path Traversal via Zip Slip under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which DotNetNuke.Core versions are affected?
Affected versions include releases prior to 9.5.0 across affected packages: DotNetNuke.Core.
What version fixes CVE-2020-5187?
Upgrading to 9.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is DotNetNuke.Core affected?
Yes, DotNetNuke.Core is affected in releases prior to 9.5.0. Upgrade your dependency to 9.5.0 or later.
What is the CVSS score of CVE-2020-5187?
CVE-2020-5187 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-5187?
CVE-2020-5187 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check NuGet dependencies for CVE-2020-5187?
Run the dependency tree command: 'inspect dependencies for DotNetNuke.Core'. 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-4qf5-7xc2-wqpg",
  "modified" : "2023-07-13T17:06:07Z",
  "published" : "2022-05-24T17:09:34Z",
  "aliases" : [ "CVE-2020-5187" ],
  "summary" : "DNN Path Traversal via Zip Slip",
  "details" : "DNN (formerly DotNetNuke) through 9.4.4 allows Path Traversal via unsafe handling of zip files",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "DotNetNuke.Core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "9.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-5187"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dnnsoftware/Dnn.Platform/releases"
  }, {
    "type" : "WEB",
    "url" : "https://medium.com/@SajjadPourali/dnn-dotnetnuke-cms-not-as-secure-as-you-think-e8516f789175"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/156489/DotNetNuke-CMS-9.4.4-Zip-Directory-Traversal.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-13T17:06:07Z",
    "nvd_published_at" : "2020-02-24T15:15:00Z"
  }
}