CVE-2020-7653: Snyk broker Arbitrary File Read Vulnerability

MODERATE
Advisory Identifier: GHSA-4vj3-f849-5r48
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CVSS 6.5
CWE-59
Published
Advisory Summary

CVE-2020-7653 is a MODERATE (CVSS 6.5) arbitrary file read vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Snyk broker libraries in the npm ecosystem. The issue involves arbitrary file read in snyk broker. Remediation is available by upgrading affected packages to version 4.80.0.

CVE-2020-7653 at a Glance

CVE Identifier CVE-2020-7653
GHSA Identifier GHSA-4vj3-f849-5r48
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Snyk broker
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:N/A:N).

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

How to Fix CVE-2020-7653

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

snyk-broker fixed: 4.80.0 
npm install snyk-broker@4.80.0
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 snyk-broker

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7653, inspect your project dependencies using npm:

npm ls snyk-broker

Analyze the terminal output to locate any version of Snyk broker in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.80.0), your application is affected.

Note: The npm ls snyk-broker 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-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In Snyk broker, 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

All versions of snyk-broker before 4.80.0 are vulnerable to Arbitrary File Read. It allows arbitrary file reads for users with access to Snyk's internal network by creating symlinks to match whitelisted paths.

CVE-2020-7653 Affected Snyk broker Versions

1 component(s)
Fixed Versions:
4.80.0
Product / Package Ecosystem Affected Versions Fixed Version
snyk-broker
npm/snyk-broker
npm
< 4.80.0
4.80.0

References

NVD — CVE-2020-7653 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7653
snyk.io/vuln/snyk-js-snykbr... WEB
https://snyk.io/vuln/SNYK-JS-SNYKBROKER-570612
Snyk broker Security Information SECURITY
https://updates.snyk.io/snyk-broker-security-fixes-152338

Frequently Asked Questions

What is CVE-2020-7653?
CVE-2020-7653 is a security vulnerability in Snyk broker involving Arbitrary File Read in Snyk Broker under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Snyk broker versions are affected?
Affected versions include releases prior to 4.80.0 across affected packages: snyk-broker.
What version fixes CVE-2020-7653?
Upgrading to 4.80.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is snyk-broker affected?
Yes, snyk-broker is affected in releases prior to 4.80.0. Upgrade your dependency to 4.80.0 or later.
What is the CVSS score of CVE-2020-7653?
CVE-2020-7653 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2020-7653?
CVE-2020-7653 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check npm dependencies for CVE-2020-7653?
Run the dependency tree command: 'npm ls snyk-broker'. 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-4vj3-f849-5r48",
  "modified" : "2021-07-29T17:23:47Z",
  "published" : "2020-06-03T22:02:21Z",
  "aliases" : [ "CVE-2020-7653" ],
  "summary" : "Arbitrary File Read in Snyk Broker",
  "details" : "All versions of snyk-broker before 4.80.0 are vulnerable to Arbitrary File Read. It allows arbitrary file reads for users with access to Snyk's internal network by creating symlinks to match whitelisted paths.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "snyk-broker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.80.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7653"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-SNYKBROKER-570612"
  }, {
    "type" : "WEB",
    "url" : "https://updates.snyk.io/snyk-broker-security-fixes-152338"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-59" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-01T19:42:29Z",
    "nvd_published_at" : "2020-05-29T21:15:00Z"
  }
}