CVE-2020-7682: Marked tree Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-xr8h-53xr-jhcm
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2020-7682 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Marked tree libraries in the npm ecosystem. The issue involves path traversal in marked-tree. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7682 at a Glance

CVE Identifier CVE-2020-7682
GHSA Identifier GHSA-xr8h-53xr-jhcm
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 Marked tree
Package Ecosystem npm
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-2020-7682

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

marked-tree fixed: Latest secure release 
npm install marked-tree@Latest secure release
Verify Direct and Transitive Dependencies

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

npm ls marked-tree

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7682, inspect your project dependencies using npm:

npm ls marked-tree

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

Note: The npm ls marked-tree command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

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 Marked tree, 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 all versions up to and including version 0.8.1 of package marked-tree. There is no path sanitization in the path provided at fs.readFile in index.js.

CVE-2020-7682 Affected Marked tree Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
marked-tree
npm/marked-tree
npm
≤ 0.8.1

References

NVD — CVE-2020-7682 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7682
snyk.io/vuln/snyk-js-marked... WEB
https://snyk.io/vuln/SNYK-JS-MARKEDTREE-590121

Frequently Asked Questions

What is CVE-2020-7682?
CVE-2020-7682 is a security vulnerability in Marked tree involving Path Traversal in marked-tree under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Marked tree versions are affected?
Affected versions include releases prior to current release patches across affected packages: marked-tree.
What version fixes CVE-2020-7682?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is marked-tree affected?
Yes, marked-tree is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-7682?
CVE-2020-7682 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-2020-7682?
CVE-2020-7682 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 npm dependencies for CVE-2020-7682?
Run the dependency tree command: 'npm ls marked-tree'. 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-xr8h-53xr-jhcm",
  "modified" : "2021-05-06T18:59:36Z",
  "published" : "2021-05-07T16:06:43Z",
  "aliases" : [ "CVE-2020-7682" ],
  "summary" : "Path Traversal in marked-tree",
  "details" : "This affects all versions up to and including version 0.8.1 of package marked-tree. There is no path sanitization in the path provided at fs.readFile in index.js.",
  "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" : "npm",
      "name" : "marked-tree"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7682"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-MARKEDTREE-590121"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-06T18:59:36Z",
    "nvd_published_at" : "2020-07-25T09:15:00Z"
  }
}