CVE-2020-36444: Async coap Data Races Vulnerability

HIGH
Advisory Identifier: GHSA-9j8q-m9x5-9g6j
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CVSS 8.1
CWE-362 CWE-119
Published
Advisory Summary

CVE-2020-36444 is a HIGH (CVSS 8.1) data races vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Async coap libraries in the crates.io ecosystem. The issue involves data races in async-coap. Remediation is available in the latest vendor maintenance releases.

CVE-2020-36444 at a Glance

CVE Identifier CVE-2020-36444
GHSA Identifier GHSA-9j8q-m9x5-9g6j
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 Async coap
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-2020-36444

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

async-coap fixed: Latest secure release 
Upgrade async-coap 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 async-coap

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36444, inspect your project dependencies for Async coap:

inspect dependencies for async-coap

Analyze the terminal output to locate any version of Async coap 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 Async coap, 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 async-coap crate through 2020-12-08 for Rust. Affected versions of this crate implement Send/Sync for `ArcGuard<RC, T>` with no trait bounds on `RC`. This allows users to send `RC: !Send` to other threads and also allows users to concurrently access `Rc: !Sync` from multiple threads. This can result in memory corruption from data race or other undefined behavior caused by sending `T: !Send` to other threads (e.g. dropping `MutexGuard<T>` in another thread that didn't lock its mutex).

CVE-2020-36444 Affected Async coap Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
async-coap
 crates.io
≤ 0.1.0

References

NVD — CVE-2020-36444 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36444
Async coap Source Repository REPOSITORY
https://github.com/google/rust-async-coap/issues/33
Async coap Source Repository REPOSITORY
https://github.com/google/rust-async-coap
raw.githubusercontent.com/rustsec/advisory-db... WEB
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/async-coap/RUSTSEC-2020-0124.md
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0124.html

Frequently Asked Questions

What is CVE-2020-36444?
CVE-2020-36444 is a security vulnerability in Async coap involving Data races in async-coap under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Async coap versions are affected?
Affected versions include releases prior to current release patches across affected packages: async-coap.
What version fixes CVE-2020-36444?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is async-coap affected?
Yes, async-coap 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-2020-36444?
CVE-2020-36444 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-2020-36444?
CVE-2020-36444 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-2020-36444?
Run the dependency tree command: 'inspect dependencies for async-coap'. 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-9j8q-m9x5-9g6j",
  "modified" : "2021-08-24T18:52:16Z",
  "published" : "2021-08-25T20:59:11Z",
  "aliases" : [ "CVE-2020-36444" ],
  "summary" : "Data races in async-coap",
  "details" : "An issue was discovered in the async-coap crate through 2020-12-08 for Rust. \nAffected versions of this crate implement Send/Sync for `ArcGuard<RC, T>` with no trait bounds on `RC`. This allows users to send `RC: !Send` to other threads and also allows users to concurrently access `Rc: !Sync` from multiple threads.\n\nThis can result in memory corruption from data race or other undefined behavior caused by sending `T: !Send` to other threads (e.g. dropping `MutexGuard<T>` in another thread that didn't lock its mutex).\n",
  "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" : "async-coap"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36444"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/google/rust-async-coap/issues/33"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/google/rust-async-coap"
  }, {
    "type" : "WEB",
    "url" : "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/async-coap/RUSTSEC-2020-0124.md"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0124.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-119", "CWE-362" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-09T21:45:44Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}