CVE-2020-35928: Concread Data Races Vulnerability

MODERATE
Advisory Identifier: GHSA-4xj5-vv9x-63jp
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CVSS 4.7
CWE-362
Published
Advisory Summary

CVE-2020-35928 is a MODERATE (CVSS 4.7) data races vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Concread libraries in the crates.io ecosystem. The issue involves data races in concread. Remediation is available by upgrading affected packages to version 0.2.6.

CVE-2020-35928 at a Glance

CVE Identifier CVE-2020-35928
GHSA Identifier GHSA-4xj5-vv9x-63jp
Severity MODERATE
CVSS v3.1 Base Score 4.7
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Concread
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 4.7

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

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
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-2020-35928

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

concread fixed: 0.2.6 
Upgrade concread to 0.2.6
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 concread

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35928, inspect your project dependencies for Concread:

inspect dependencies for concread

Analyze the terminal output to locate any version of Concread in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.2.6), 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 Concread, 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 concread crate before 0.2.6 for Rust. Attackers can cause an ARCache<K,V> data race by sending types that do not implement Send/Sync.

CVE-2020-35928 Affected Concread Versions

1 component(s)
Fixed Versions:
0.2.6
Product / Package Ecosystem Affected Versions Fixed Version
concread
 crates.io
< 0.2.6
0.2.6

References

NVD — CVE-2020-35928 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35928
Concread Source Repository REPOSITORY
https://github.com/kanidm/concread/issues/48
Concread Source Repository REPOSITORY
https://github.com/kanidm/concread
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0092.html

Frequently Asked Questions

What is CVE-2020-35928?
CVE-2020-35928 is a security vulnerability in Concread involving Data races in concread under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Concread versions are affected?
Affected versions include releases prior to 0.2.6 across affected packages: concread.
What version fixes CVE-2020-35928?
Upgrading to 0.2.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is concread affected?
Yes, concread is affected in releases prior to 0.2.6. Upgrade your dependency to 0.2.6 or later.
What is the CVSS score of CVE-2020-35928?
CVE-2020-35928 has a CVSS v3.1 base score of 4.7 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-35928?
CVE-2020-35928 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-2020-35928?
Run the dependency tree command: 'inspect dependencies for concread'. 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-4xj5-vv9x-63jp",
  "modified" : "2021-08-19T18:56:22Z",
  "published" : "2021-08-25T20:50:22Z",
  "aliases" : [ "CVE-2020-35928" ],
  "summary" : "Data races in concread",
  "details" : "An issue was discovered in the concread crate before 0.2.6 for Rust. Attackers can cause an ARCache<K,V> data race by sending types that do not implement Send/Sync.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "concread"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35928"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kanidm/concread/issues/48"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kanidm/concread"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0092.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T18:56:11Z",
    "nvd_published_at" : null
  }
}