CVE-2021-23415: ElFinder.AspNet Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-pjxv-w3qj-j8m3
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2021-23415 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting ElFinder.AspNet libraries in the NuGet ecosystem. The issue involves directory traversal in elfinder.aspnet. Remediation is available by upgrading affected packages to version 1.1.1.

CVE-2021-23415 at a Glance

CVE Identifier CVE-2021-23415
GHSA Identifier GHSA-pjxv-w3qj-j8m3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product ElFinder.AspNet
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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 None (I:N)
Availability None (A:N)

How to Fix CVE-2021-23415

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

elFinder.AspNet fixed: 1.1.1 
Upgrade elFinder.AspNet to 1.1.1
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 elFinder.AspNet

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-23415, inspect your project dependencies for ElFinder.AspNet:

inspect dependencies for elFinder.AspNet

Analyze the terminal output to locate any version of ElFinder.AspNet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.1.1), 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-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 ElFinder.AspNet, 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

This affects the package elFinder.AspNet before 1.1.1. The user-controlled file name is not properly sanitized before it is used to create a file system path.

CVE-2021-23415 Affected ElFinder.AspNet Versions

1 component(s)
Fixed Versions:
1.1.1
Product / Package Ecosystem Affected Versions Fixed Version
elFinder.AspNet
nuget/elFinder.AspNet
NuGet
< 1.1.1
1.1.1

References

NVD — CVE-2021-23415 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23415
Security Fix Commit FIX COMMIT
https://github.com/mguinness/elFinder.AspNet/commit/675049b39284a9e84f0915c71d688da8ebc7d720
ElFinder.AspNet Source Repository REPOSITORY
https://github.com/mguinness/elFinder.AspNet
snyk.io/vuln/snyk-dotnet-el... WEB
https://snyk.io/vuln/SNYK-DOTNET-ELFINDERASPNET-1315153

Frequently Asked Questions

What is CVE-2021-23415?
CVE-2021-23415 is a security vulnerability in ElFinder.AspNet involving Directory Traversal in elFinder.AspNet under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which ElFinder.AspNet versions are affected?
Affected versions include releases prior to 1.1.1 across affected packages: elFinder.AspNet.
What version fixes CVE-2021-23415?
Upgrading to 1.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is elFinder.AspNet affected?
Yes, elFinder.AspNet is affected in releases prior to 1.1.1. Upgrade your dependency to 1.1.1 or later.
What is the CVSS score of CVE-2021-23415?
CVE-2021-23415 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-23415?
CVE-2021-23415 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-2021-23415?
Run the dependency tree command: 'inspect dependencies for elFinder.AspNet'. 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-pjxv-w3qj-j8m3",
  "modified" : "2021-08-31T21:00:58Z",
  "published" : "2021-08-09T20:42:13Z",
  "aliases" : [ "CVE-2021-23415" ],
  "summary" : "Directory Traversal in elFinder.AspNet",
  "details" : "This affects the package elFinder.AspNet before 1.1.1.\n The user-controlled file name is not properly sanitized before it is used to create a file system path.\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "elFinder.AspNet"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23415"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mguinness/elFinder.AspNet/commit/675049b39284a9e84f0915c71d688da8ebc7d720"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mguinness/elFinder.AspNet"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-DOTNET-ELFINDERASPNET-1315153"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-02T18:41:18Z",
    "nvd_published_at" : "2021-07-28T16:15:00Z"
  }
}