CVE-2020-7740: Node pdf generator Server-Side Request Forgery Vulnerability

HIGH
Advisory Identifier: GHSA-hcq6-h8v2-r5wm
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CVSS 8.2
CWE-20 CWE-918
Published
Advisory Summary

CVE-2020-7740 is a HIGH (CVSS 8.2) server-side request forgery vulnerability (CWE-20: Improper Input Validation) affecting Node pdf generator libraries in the npm ecosystem. The issue involves server-side request forgery in node-pdf-generator. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7740 at a Glance

CVE Identifier CVE-2020-7740
GHSA Identifier GHSA-hcq6-h8v2-r5wm
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-20: Improper Input Validation
Affected Product Node pdf generator
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:L/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 Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-7740

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

node-pdf-generator fixed: Latest secure release 
npm install node-pdf-generator@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 node-pdf-generator

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7740, inspect your project dependencies using npm:

npm ls node-pdf-generator

Analyze the terminal output to locate any version of Node pdf generator 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 node-pdf-generator 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Node pdf generator, 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 of package node-pdf-generator up to and including 0.0.6. Due to lack of user input validation and sanitization done to the content given to node-pdf-generator, it is possible for an attacker to craft a url that will be passed to an external server allowing an SSRF attack.

CVE-2020-7740 Affected Node pdf generator Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
node-pdf-generator
npm/node-pdf-generator
npm
≤ 0.0.6

References

NVD — CVE-2020-7740 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7740
Node pdf generator Source Repository REPOSITORY
https://github.com/darrenhaken/node-pdf-generator/blob/master/index.js%23L29
snyk.io/vuln/snyk-js-nodepd... WEB
https://snyk.io/vuln/SNYK-JS-NODEPDFGENERATOR-609636

Frequently Asked Questions

What is CVE-2020-7740?
CVE-2020-7740 is a security vulnerability in Node pdf generator involving Server-Side Request Forgery in node-pdf-generator under CWE-20: Improper Input Validation.
Which Node pdf generator versions are affected?
Affected versions include releases prior to current release patches across affected packages: node-pdf-generator.
What version fixes CVE-2020-7740?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is node-pdf-generator affected?
Yes, node-pdf-generator 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-2020-7740?
CVE-2020-7740 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2020-7740?
CVE-2020-7740 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check npm dependencies for CVE-2020-7740?
Run the dependency tree command: 'npm ls node-pdf-generator'. 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-hcq6-h8v2-r5wm",
  "modified" : "2021-04-21T20:52:05Z",
  "published" : "2021-05-10T18:38:34Z",
  "aliases" : [ "CVE-2020-7740" ],
  "summary" : "Server-Side Request Forgery in node-pdf-generator",
  "details" : "This affects all versions of package node-pdf-generator up to and including 0.0.6. Due to lack of user input validation and sanitization done to the content given to node-pdf-generator, it is possible for an attacker to craft a url that will be passed to an external server allowing an SSRF attack.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "node-pdf-generator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.0.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7740"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/darrenhaken/node-pdf-generator/blob/master/index.js%23L29"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-NODEPDFGENERATOR-609636"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-21T20:52:05Z",
    "nvd_published_at" : "2020-10-06T18:15:00Z"
  }
}