CVE-2020-36456: Toolshed Data Races Vulnerability

HIGH
Advisory Identifier: GHSA-2r6q-6c8c-g762
Share
CVSS 8.1
CWE-362 CWE-77
Published
Advisory Summary

CVE-2020-36456 is a HIGH (CVSS 8.1) data races vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Toolshed libraries in the crates.io ecosystem. The issue involves data races in toolshed. Remediation is available in the latest vendor maintenance releases.

CVE-2020-36456 at a Glance

CVE Identifier CVE-2020-36456
GHSA Identifier GHSA-2r6q-6c8c-g762
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Toolshed
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-2020-36456

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

toolshed fixed: Latest secure release 
Upgrade toolshed 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 toolshed

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36456, inspect your project dependencies for Toolshed:

inspect dependencies for toolshed

Analyze the terminal output to locate any version of Toolshed 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Toolshed, 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 toolshed crate through 2020-11-15 for Rust. In CopyCell<T>, the Send trait lacks bounds on the contained type.

CVE-2020-36456 Affected Toolshed Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
toolshed
 crates.io
≤ 0.8.1

References

NVD — CVE-2020-36456 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36456
Toolshed Source Repository REPOSITORY
https://github.com/ratel-rust/toolshed/issues/12
Toolshed Source Repository REPOSITORY
https://github.com/ratel-rust/toolshed
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0136.html

Frequently Asked Questions

What is CVE-2020-36456?
CVE-2020-36456 is a security vulnerability in Toolshed involving Data races in toolshed under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Toolshed versions are affected?
Affected versions include releases prior to current release patches across affected packages: toolshed.
What version fixes CVE-2020-36456?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is toolshed affected?
Yes, toolshed 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-2020-36456?
CVE-2020-36456 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-2020-36456?
CVE-2020-36456 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check crates.io dependencies for CVE-2020-36456?
Run the dependency tree command: 'inspect dependencies for toolshed'. 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-2r6q-6c8c-g762",
  "modified" : "2021-08-18T20:21:02Z",
  "published" : "2021-08-25T20:58:03Z",
  "aliases" : [ "CVE-2020-36456" ],
  "summary" : "Data races in toolshed",
  "details" : "An issue was discovered in the toolshed crate through 2020-11-15 for Rust. In CopyCell<T>, the Send trait lacks bounds on the contained type.",
  "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" : "toolshed"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36456"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ratel-rust/toolshed/issues/12"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ratel-rust/toolshed"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0136.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362", "CWE-77" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-18T20:20:49Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}