CVE-2023-3348: Wrangler Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-8c93-4hch-xgxp
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CVSS 5.7
CWE-22
Published
Advisory Summary

CVE-2023-3348 is a MODERATE (CVSS 5.7) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Wrangler libraries in the npm ecosystem. The issue involves cloudflare wrangler directory traversal vulnerability. Remediation is available by upgrading affected packages to version 2.20.1.

CVE-2023-3348 at a Glance

CVE Identifier CVE-2023-3348
GHSA Identifier GHSA-8c93-4hch-xgxp
Severity MODERATE
CVSS v3.1 Base Score 5.7
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Wrangler
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.7

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

Attack Vector Adjacent (AV:A)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2023-3348

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

wrangler fixed: 2.20.1 
npm install wrangler@2.20.1
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 wrangler

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2023-3348, inspect your project dependencies using npm:

npm ls wrangler

Analyze the terminal output to locate any version of Wrangler in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.20.1), your application is affected.

Note: The npm ls wrangler 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 Wrangler, 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

### Impact The Wrangler command line tool (<=wrangler@3.1.0 or <=wrangler@2.20.1) was affected by a directory traversal vulnerability when running a local development server for Pages (wrangler pages dev command). This vulnerability enabled an attacker in the same network as the victim to connect to the local development server and access the victim's files present outside of the directory for the development server. ### Patches Wrangler2: Upgrade to v2.20.1 or higher. Wrangler3: Upgrade to v3.1.1 or higher. ### References [Workers SDK on Github](https://github.com/cloudflare/workers-sdk) [Wrangler docs](https://developers.cloudflare.com/workers/wrangler/) [CVE-2023-3348](https://www.cve.org/CVERecord?id=CVE-2023-3348)

CVE-2023-3348 Affected Wrangler Versions

1 component(s)
Fixed Versions:
2.20.1
Product / Package Ecosystem Affected Versions Fixed Version
wrangler
npm/wrangler
npm
< 2.20.1
2.20.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-8c93-4hch-xgxp
NVD — CVE-2023-3348 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-3348
Wrangler Source Repository REPOSITORY
https://github.com/cloudflare/workers-sdk/pull/3498
Security Fix Commit FIX COMMIT
https://github.com/cloudflare/workers-sdk/commit/fddffdf0c23d2ca56f2139a2c6bc278052594cba
developers.cloudflare.com/workers/wrangler WEB
https://developers.cloudflare.com/workers/wrangler
Wrangler Source Repository REPOSITORY
https://github.com/cloudflare/workers-sdk
Wrangler Release RELEASE
https://github.com/cloudflare/workers-sdk/releases/tag/wrangler%403.1.1

Frequently Asked Questions

What is CVE-2023-3348?
CVE-2023-3348 is a security vulnerability in Wrangler involving Cloudflare Wrangler directory traversal vulnerability under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Wrangler versions are affected?
Affected versions include releases prior to 2.20.1 across affected packages: wrangler.
What version fixes CVE-2023-3348?
Upgrading to 2.20.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is wrangler affected?
Yes, wrangler is affected in releases prior to 2.20.1. Upgrade your dependency to 2.20.1 or later.
What is the CVSS score of CVE-2023-3348?
CVE-2023-3348 has a CVSS v3.1 base score of 5.7 (MODERATE) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2023-3348?
CVE-2023-3348 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-2023-3348?
Run the dependency tree command: 'npm ls wrangler'. 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-8c93-4hch-xgxp",
  "modified" : "2023-08-31T16:43:19Z",
  "published" : "2023-08-03T16:34:31Z",
  "aliases" : [ "CVE-2023-3348" ],
  "summary" : "Cloudflare Wrangler directory traversal vulnerability",
  "details" : "### Impact \nThe Wrangler command line tool (<=wrangler@3.1.0 or <=wrangler@2.20.1) was affected by a directory traversal vulnerability when running a local development server for Pages (wrangler pages dev command). This vulnerability enabled an attacker in the same network as the victim to connect to the local development server and access the victim's files present outside of the directory for the development server.\n\n### Patches\nWrangler2: Upgrade to v2.20.1 or higher.\nWrangler3: Upgrade to v3.1.1 or higher.\n\n### References\n[Workers SDK on Github](https://github.com/cloudflare/workers-sdk)\n[Wrangler docs](https://developers.cloudflare.com/workers/wrangler/)\n[CVE-2023-3348](https://www.cve.org/CVERecord?id=CVE-2023-3348)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "wrangler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.20.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-8c93-4hch-xgxp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-3348"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/workers-sdk/pull/3498"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/workers-sdk/commit/fddffdf0c23d2ca56f2139a2c6bc278052594cba"
  }, {
    "type" : "WEB",
    "url" : "https://developers.cloudflare.com/workers/wrangler"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cloudflare/workers-sdk"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/workers-sdk/releases/tag/wrangler%403.1.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-08-03T16:34:31Z",
    "nvd_published_at" : "2023-08-03T15:15:30Z"
  }
}