CVE-2020-36208: Conquer once Data Races Vulnerability

HIGH
Advisory Identifier: GHSA-3jc5-5hc5-33gj
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CVSS 7.8
CWE-662 CWE-787
Published
Advisory Summary

CVE-2020-36208 is a HIGH (CVSS 7.8) data races vulnerability (CWE-662: Improper Synchronization) affecting Conquer once libraries in the crates.io ecosystem. The issue involves data races in conquer-once. Remediation is available by upgrading affected packages to version 0.3.2.

CVE-2020-36208 at a Glance

CVE Identifier CVE-2020-36208
GHSA Identifier GHSA-3jc5-5hc5-33gj
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-662: Improper Synchronization
Affected Product Conquer once
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-36208

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

conquer-once fixed: 0.3.2 
Upgrade conquer-once to 0.3.2
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 conquer-once

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36208, inspect your project dependencies for Conquer once:

inspect dependencies for conquer-once

Analyze the terminal output to locate any version of Conquer once in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.2), 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-662: Improper Synchronization, where the product utilizes multiple threads, processes, components, or systems to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes. In Conquer once, 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

Affected versions of conquer-once implements Sync for its OnceCell type without restricting it to Sendable types. This allows non-Send but Sync types such as MutexGuard to be sent across threads leading to undefined behavior and memory corruption in concurrent programs. The issue was fixed by adding a Send constraint to OnceCell.

CVE-2020-36208 Affected Conquer once Versions

1 component(s)
Fixed Versions:
0.3.2
Product / Package Ecosystem Affected Versions Fixed Version
conquer-once
 crates.io
< 0.3.2
0.3.2

References

NVD — CVE-2020-36208 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36208
Conquer once Source Repository REPOSITORY
https://github.com/oliver-giersch/conquer-once/issues/3
Conquer once Source Repository REPOSITORY
https://github.com/oliver-giersch/conquer-once
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0101.html

Frequently Asked Questions

What is CVE-2020-36208?
CVE-2020-36208 is a security vulnerability in Conquer once involving Data races in conquer-once under CWE-662: Improper Synchronization.
Which Conquer once versions are affected?
Affected versions include releases prior to 0.3.2 across affected packages: conquer-once.
What version fixes CVE-2020-36208?
Upgrading to 0.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is conquer-once affected?
Yes, conquer-once is affected in releases prior to 0.3.2. Upgrade your dependency to 0.3.2 or later.
What is the CVSS score of CVE-2020-36208?
CVE-2020-36208 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-36208?
CVE-2020-36208 is classified under CWE-662: Improper Synchronization (The product utilizes multiple threads, processes, components, or systems to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes.).
How can I check crates.io dependencies for CVE-2020-36208?
Run the dependency tree command: 'inspect dependencies for conquer-once'. 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-3jc5-5hc5-33gj",
  "modified" : "2023-06-13T17:00:10Z",
  "published" : "2021-08-25T20:50:49Z",
  "aliases" : [ "CVE-2020-36208" ],
  "summary" : "Data races in conquer-once",
  "details" : "Affected versions of conquer-once implements Sync for its OnceCell type without restricting it to Sendable types.\n\nThis allows non-Send but Sync types such as MutexGuard to be sent across threads leading to undefined behavior and memory corruption in concurrent programs.\n\nThe issue was fixed by adding a Send constraint to OnceCell.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "conquer-once"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36208"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/oliver-giersch/conquer-once/issues/3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/oliver-giersch/conquer-once"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0101.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-662", "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T18:51:18Z",
    "nvd_published_at" : null
  }
}