CVE-2020-7679: Casperjs Improperly Controlled Modification Of Dynamically-Determined Vulnerability

HIGH
Advisory Identifier: GHSA-vrr3-5r3v-7xfw
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CVSS 7.3
CWE-1321 CWE-915
Published
Advisory Summary

CVE-2020-7679 is a HIGH (CVSS 7.3) improperly controlled modification of dynamically-determined vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Casperjs libraries in the npm ecosystem. The issue involves improperly controlled modification of dynamically-determined object attributes in casperjs. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7679 at a Glance

CVE Identifier CVE-2020-7679
GHSA Identifier GHSA-vrr3-5r3v-7xfw
Severity HIGH
CVSS v3.1 Base Score 7.3
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Casperjs
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.3

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:L/I:L/A:L).

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 Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2020-7679

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

casperjs fixed: Latest secure release 
npm install casperjs@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 casperjs

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7679, inspect your project dependencies using npm:

npm ls casperjs

Analyze the terminal output to locate any version of Casperjs 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 casperjs 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-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Casperjs, 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

### Overview casperjs is a navigation scripting & testing utility for PhantomJS and SlimerJS. Affected versions of this package are vulnerable to Prototype Pollution via the mergeObjects utility function. ### PoC ```js var payload = JSON.parse('{"__proto__": {"a": "pwned"}}'); mergeObjects({}, payload); console.log({}.a); // prints "pwned" ```

CVE-2020-7679 Affected Casperjs Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
casperjs
npm/casperjs
npm
≤ 1.1.4

References

NVD — CVE-2020-7679 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7679
Casperjs Source Repository REPOSITORY
https://github.com/casperjs/casperjs
Casperjs Source Repository REPOSITORY
https://github.com/casperjs/casperjs/blob/master/modules/utils.js%23L680
snyk.io/vuln/snyk-java-orgw... WEB
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-572804
snyk.io/vuln/snyk-js-casper... WEB
https://snyk.io/vuln/SNYK-JS-CASPERJS-572803

Frequently Asked Questions

What is CVE-2020-7679?
CVE-2020-7679 is a security vulnerability in Casperjs involving Improperly Controlled Modification of Dynamically-Determined Object Attributes in casperjs under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Casperjs versions are affected?
Affected versions include releases prior to current release patches across affected packages: casperjs.
What version fixes CVE-2020-7679?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is casperjs affected?
Yes, casperjs 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-2020-7679?
CVE-2020-7679 has a CVSS v3.1 base score of 7.3 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2020-7679?
CVE-2020-7679 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for CVE-2020-7679?
Run the dependency tree command: 'npm ls casperjs'. 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-vrr3-5r3v-7xfw",
  "modified" : "2023-09-13T19:52:14Z",
  "published" : "2021-05-17T21:00:52Z",
  "aliases" : [ "CVE-2020-7679" ],
  "summary" : "Improperly Controlled Modification of Dynamically-Determined Object Attributes in casperjs",
  "details" : "### Overview\ncasperjs is a navigation scripting & testing utility for PhantomJS and SlimerJS.\n\nAffected versions of this package are vulnerable to Prototype Pollution via the mergeObjects utility function.\n\n### PoC\n```js\nvar payload = JSON.parse('{\"__proto__\": {\"a\": \"pwned\"}}');\nmergeObjects({}, payload);\nconsole.log({}.a); // prints \"pwned\"\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "casperjs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7679"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/casperjs/casperjs"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/casperjs/casperjs/blob/master/modules/utils.js%23L680"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-572804"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-CASPERJS-572803"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321", "CWE-915" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-11T22:26:54Z",
    "nvd_published_at" : "2020-06-19T11:15:00Z"
  }
}