CVE-2020-36215: Hashconsing Data Races Vulnerability

HIGH
Advisory Identifier: GHSA-rw2c-c256-3r53
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CVSS 7.5
CWE-662 CWE-787
Published
Advisory Summary

CVE-2020-36215 is a HIGH (CVSS 7.5) data races vulnerability (CWE-662: Improper Synchronization) affecting Hashconsing libraries in the crates.io ecosystem. The issue involves data races in hashconsing. Remediation is available by upgrading affected packages to version 1.1.0.

CVE-2020-36215 at a Glance

CVE Identifier CVE-2020-36215
GHSA Identifier GHSA-rw2c-c256-3r53
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-662: Improper Synchronization
Affected Product Hashconsing
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-2020-36215

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

hashconsing fixed: 1.1.0 
Upgrade hashconsing to 1.1.0
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 hashconsing

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36215, inspect your project dependencies for Hashconsing:

inspect dependencies for hashconsing

Analyze the terminal output to locate any version of Hashconsing in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.1.0), 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-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 Hashconsing, 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 hashconsing implements Send/Sync for its HConsed type without restricting it to Sendable types and Syncable types. This allows non-Sync types such as Cell to be shared across threads leading to undefined behavior and memory corruption in concurrent programs.

CVE-2020-36215 Affected Hashconsing Versions

1 component(s)
Fixed Versions:
1.1.0
Product / Package Ecosystem Affected Versions Fixed Version
hashconsing
 crates.io
< 1.1.0
1.1.0

References

NVD — CVE-2020-36215 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36215
Hashconsing Source Repository REPOSITORY
https://github.com/AdrienChampion/hashconsing/issues/1
Hashconsing Source Repository REPOSITORY
https://github.com/AdrienChampion/hashconsing
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0107.html

Frequently Asked Questions

What is CVE-2020-36215?
CVE-2020-36215 is a security vulnerability in Hashconsing involving Data races in hashconsing under CWE-662: Improper Synchronization.
Which Hashconsing versions are affected?
Affected versions include releases prior to 1.1.0 across affected packages: hashconsing.
What version fixes CVE-2020-36215?
Upgrading to 1.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hashconsing affected?
Yes, hashconsing is affected in releases prior to 1.1.0. Upgrade your dependency to 1.1.0 or later.
What is the CVSS score of CVE-2020-36215?
CVE-2020-36215 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-2020-36215?
CVE-2020-36215 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-2020-36215?
Run the dependency tree command: 'inspect dependencies for hashconsing'. 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-rw2c-c256-3r53",
  "modified" : "2023-06-13T18:08:34Z",
  "published" : "2021-08-25T20:51:52Z",
  "aliases" : [ "CVE-2020-36215" ],
  "summary" : "Data races in hashconsing",
  "details" : "Affected versions of hashconsing implements Send/Sync for its HConsed type without restricting it to Sendable types and Syncable types. This allows non-Sync types such as Cell to be shared across threads leading to undefined behavior and memory corruption in concurrent programs.",
  "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" : "hashconsing"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36215"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AdrienChampion/hashconsing/issues/1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/AdrienChampion/hashconsing"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0107.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-662", "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T18:47:26Z",
    "nvd_published_at" : "2021-01-26T18:15:00Z"
  }
}