CVE-2020-6638: Grin Grin Insufficient Validation Vulnerability

HIGH
Advisory Identifier: GHSA-7w6p-rwhg-7h3g
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2020-6638 is a HIGH (CVSS 7.5) grin insufficient validation vulnerability (CWE-20: Improper Input Validation) affecting Grin libraries in the crates.io ecosystem. The issue involves grin insufficient validation. Remediation is available by upgrading affected packages to version 3.0.0.

CVE-2020-6638 at a Glance

CVE Identifier CVE-2020-6638
GHSA Identifier GHSA-7w6p-rwhg-7h3g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Grin
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-6638

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

grin fixed: 3.0.0 
Upgrade grin to 3.0.0
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 grin

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-6638, inspect your project dependencies for Grin:

inspect dependencies for grin

Analyze the terminal output to locate any version of Grin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.0), 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-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 Grin, 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

Grin through 2.1.1 has Insufficient Validation.

CVE-2020-6638 Affected Grin Versions

1 component(s)
Fixed Versions:
3.0.0
Product / Package Ecosystem Affected Versions Fixed Version
grin
 crates.io
< 3.0.0
3.0.0

References

NVD — CVE-2020-6638 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-6638
Grin Source Repository REPOSITORY
https://github.com/mimblewimble/grin-security/blob/master/CVEs/CVE-2020-6638.md
Grin Source Repository REPOSITORY
https://github.com/mimblewimble/grin/compare/v2.1.1...v3.0.0

Frequently Asked Questions

What is CVE-2020-6638?
CVE-2020-6638 is a security vulnerability in Grin involving Grin Insufficient Validation under CWE-20: Improper Input Validation.
Which Grin versions are affected?
Affected versions include releases prior to 3.0.0 across affected packages: grin.
What version fixes CVE-2020-6638?
Upgrading to 3.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is grin affected?
Yes, grin is affected in releases prior to 3.0.0. Upgrade your dependency to 3.0.0 or later.
What is the CVSS score of CVE-2020-6638?
CVE-2020-6638 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-6638?
CVE-2020-6638 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 crates.io dependencies for CVE-2020-6638?
Run the dependency tree command: 'inspect dependencies for grin'. 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-7w6p-rwhg-7h3g",
  "modified" : "2024-02-01T21:24:14Z",
  "published" : "2022-05-24T17:07:02Z",
  "aliases" : [ "CVE-2020-6638" ],
  "summary" : "Grin Insufficient Validation",
  "details" : "Grin through 2.1.1 has Insufficient Validation.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "grin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-6638"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mimblewimble/grin-security/blob/master/CVEs/CVE-2020-6638.md"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mimblewimble/grin/compare/v2.1.1...v3.0.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-01T21:24:14Z",
    "nvd_published_at" : "2020-01-21T20:15:00Z"
  }
}