CVE-2020-25796: Sized chunks Unaligned References Vulnerability

HIGH
Advisory Identifier: GHSA-fqpx-cq8x-9wp4
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CVSS 7.5
CWE-129
Published
Advisory Summary

CVE-2020-25796 is a HIGH (CVSS 7.5) unaligned references vulnerability (CWE-129: Improper Validation of Array Index) affecting Sized chunks libraries in the crates.io ecosystem. The issue involves unaligned references in sized-chunks. Remediation is available by upgrading affected packages to version 0.6.3.

CVE-2020-25796 at a Glance

CVE Identifier CVE-2020-25796
GHSA Identifier GHSA-fqpx-cq8x-9wp4
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-129: Improper Validation of Array Index
Affected Product Sized chunks
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-2020-25796

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

sized-chunks fixed: 0.6.3 
Upgrade sized-chunks to 0.6.3
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 sized-chunks

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-25796, inspect your project dependencies for Sized chunks:

inspect dependencies for sized-chunks

Analyze the terminal output to locate any version of Sized chunks in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.3), 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-129: Improper Validation of Array Index, where the product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. In Sized chunks, 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 sized-chunks crate through 0.6.2 for Rust. In the InlineArray implementation, an unaligned reference may be generated for a type that has a large alignment requirement.

CVE-2020-25796 Affected Sized chunks Versions

1 component(s)
Fixed Versions:
0.6.3
Product / Package Ecosystem Affected Versions Fixed Version
sized-chunks
 crates.io
< 0.6.3
0.6.3

References

NVD — CVE-2020-25796 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25796
Sized chunks Source Repository REPOSITORY
https://github.com/bodil/sized-chunks/issues/11
Sized chunks Source Repository REPOSITORY
https://github.com/bodil/sized-chunks
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0041.html

Frequently Asked Questions

What is CVE-2020-25796?
CVE-2020-25796 is a security vulnerability in Sized chunks involving Unaligned references in sized-chunks under CWE-129: Improper Validation of Array Index.
Which Sized chunks versions are affected?
Affected versions include releases prior to 0.6.3 across affected packages: sized-chunks.
What version fixes CVE-2020-25796?
Upgrading to 0.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sized-chunks affected?
Yes, sized-chunks is affected in releases prior to 0.6.3. Upgrade your dependency to 0.6.3 or later.
What is the CVSS score of CVE-2020-25796?
CVE-2020-25796 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-2020-25796?
CVE-2020-25796 is classified under CWE-129: Improper Validation of Array Index (The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.).
How can I check crates.io dependencies for CVE-2020-25796?
Run the dependency tree command: 'inspect dependencies for sized-chunks'. 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-fqpx-cq8x-9wp4",
  "modified" : "2021-08-19T21:20:35Z",
  "published" : "2021-08-25T20:46:03Z",
  "aliases" : [ "CVE-2020-25796" ],
  "summary" : "Unaligned references in sized-chunks",
  "details" : "An issue was discovered in the sized-chunks crate through 0.6.2 for Rust. In the InlineArray implementation, an unaligned reference may be generated for a type that has a large alignment requirement.",
  "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" : "sized-chunks"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25796"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bodil/sized-chunks/issues/11"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/bodil/sized-chunks"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0041.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-129" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:20:35Z",
    "nvd_published_at" : null
  }
}