CVE-2020-36433: Chunky Unaligned Memory Allocation Vulnerability

HIGH
Advisory Identifier: GHSA-qg24-8xj4-gj2h
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CVSS 7.5
CWE-758
Published
Advisory Summary

CVE-2020-36433 is a HIGH (CVSS 7.5) unaligned memory allocation vulnerability (CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior) affecting Chunky libraries in the crates.io ecosystem. The issue involves unaligned memory allocation in chunky. Remediation is available in the latest vendor maintenance releases.

CVE-2020-36433 at a Glance

CVE Identifier CVE-2020-36433
GHSA Identifier GHSA-qg24-8xj4-gj2h
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Affected Product Chunky
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:H/A:N).

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 High (I:H)
Availability None (A:N)

How to Fix CVE-2020-36433

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

chunky fixed: Latest secure release 
Upgrade chunky 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 chunky

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36433, inspect your project dependencies for Chunky:

inspect dependencies for chunky

Analyze the terminal output to locate any version of Chunky 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-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior, where the product uses an api function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity. In Chunky, 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 chunky crate through 2020-08-25 for Rust. The Chunk API does not honor an alignment requirement.

CVE-2020-36433 Affected Chunky Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
chunky
 crates.io
≤ 0.3.7

References

NVD — CVE-2020-36433 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36433
Chunky Source Repository REPOSITORY
https://github.com/aeplay/chunky/issues/2
Chunky Source Repository REPOSITORY
https://github.com/aeplay/chunky
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0035.html

Frequently Asked Questions

What is CVE-2020-36433?
CVE-2020-36433 is a security vulnerability in Chunky involving Unaligned memory allocation in chunky under CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior.
Which Chunky versions are affected?
Affected versions include releases prior to current release patches across affected packages: chunky.
What version fixes CVE-2020-36433?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is chunky affected?
Yes, chunky 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-2020-36433?
CVE-2020-36433 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:H/A:N.
What CWE is associated with CVE-2020-36433?
CVE-2020-36433 is classified under CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior (The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.).
How can I check crates.io dependencies for CVE-2020-36433?
Run the dependency tree command: 'inspect dependencies for chunky'. 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-qg24-8xj4-gj2h",
  "modified" : "2021-08-18T20:17:28Z",
  "published" : "2021-08-25T20:58:13Z",
  "aliases" : [ "CVE-2020-36433" ],
  "summary" : "Unaligned memory allocation in chunky",
  "details" : "An issue was discovered in the chunky crate through 2020-08-25 for Rust. The Chunk API does not honor an alignment requirement.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "chunky"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.3.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36433"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aeplay/chunky/issues/2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/aeplay/chunky"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0035.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-758" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-18T20:17:28Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}