CVE-2020-35889: Crayon Memory Safety Violation Vulnerability

HIGH
Advisory Identifier: GHSA-m833-jv95-mfjh
Share
CVSS 8.1
CWE-367
Published
Advisory Summary

CVE-2020-35889 is a HIGH (CVSS 8.1) memory safety violation vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting Crayon libraries in the crates.io ecosystem. The issue involves memory safety violation in crayon. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35889 at a Glance

CVE Identifier CVE-2020-35889
GHSA Identifier GHSA-m833-jv95-mfjh
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Product Crayon
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2020-35889

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

crayon fixed: Latest secure release 
Upgrade crayon to 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: 

inspect dependencies for crayon

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35889, inspect your project dependencies for Crayon:

inspect dependencies for crayon

Analyze the terminal output to locate any version of Crayon 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: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where the product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. In Crayon, 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

An issue was discovered in the crayon crate through 2020-08-31 for Rust. A TOCTOU issue has a resultant memory safety violation via HandleLike.

CVE-2020-35889 Affected Crayon Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
crayon
 crates.io
≤ 0.7.1

References

NVD — CVE-2020-35889 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35889
Crayon Source Repository REPOSITORY
https://github.com/shawnscode/crayon/issues/87
Crayon Source Repository REPOSITORY
https://github.com/shawnscode/crayon
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0037.html

Frequently Asked Questions

What is CVE-2020-35889?
CVE-2020-35889 is a security vulnerability in Crayon involving Memory safety violation in crayon under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition.
Which Crayon versions are affected?
Affected versions include releases prior to current release patches across affected packages: crayon.
What version fixes CVE-2020-35889?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is crayon affected?
Yes, crayon 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-2020-35889?
CVE-2020-35889 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-35889?
CVE-2020-35889 is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.).
How can I check crates.io dependencies for CVE-2020-35889?
Run the dependency tree command: 'inspect dependencies for crayon'. 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-m833-jv95-mfjh",
  "modified" : "2021-08-19T20:56:31Z",
  "published" : "2021-08-25T20:48:50Z",
  "aliases" : [ "CVE-2020-35889" ],
  "summary" : "Memory safety violation in crayon",
  "details" : "An issue was discovered in the crayon crate through 2020-08-31 for Rust. A TOCTOU issue has a resultant memory safety violation via HandleLike.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "crayon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.7.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35889"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/shawnscode/crayon/issues/87"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/shawnscode/crayon"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0037.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T20:56:31Z",
    "nvd_published_at" : null
  }
}