CVE-2019-16143: Blake2 Algorithms Compute Incorrect Results Vulnerability

CRITICAL
Advisory Identifier: GHSA-4x25-pvhw-5224
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CVSS 9.8
CWE-327
Published
Advisory Summary

CVE-2019-16143 is a CRITICAL (CVSS 9.8) algorithms compute incorrect results vulnerability (CWE-327: Use of a Broken or Risky Cryptographic Algorithm) affecting Blake2 libraries in the crates.io ecosystem. The issue involves algorithms compute incorrect results in blake2. Remediation is available by upgrading affected packages to version 0.8.1.

CVE-2019-16143 at a Glance

CVE Identifier CVE-2019-16143
GHSA Identifier GHSA-4x25-pvhw-5224
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-327: Use of a Broken or Risky Cryptographic Algorithm
Affected Product Blake2
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-16143

To remediate this vulnerability, upgrade all affected Blake2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

blake2 fixed: 0.8.1 
Upgrade blake2 to 0.8.1
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 blake2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-16143, inspect your project dependencies for Blake2:

inspect dependencies for blake2

Analyze the terminal output to locate any version of Blake2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.8.1), 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-327: Use of a Broken or Risky Cryptographic Algorithm, where the product uses a broken or risky cryptographic algorithm or protocol. In Blake2, 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 blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.

CVE-2019-16143 Affected Blake2 Versions

1 component(s)
Fixed Versions:
0.8.1
Product / Package Ecosystem Affected Versions Fixed Version
blake2
 crates.io
< 0.8.1
0.8.1

References

NVD — CVE-2019-16143 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-16143
Blake2 Source Repository REPOSITORY
https://github.com/RustCrypto/MACs/issues/19
Blake2 Source Repository REPOSITORY
https://github.com/RustCrypto/hashes/tree/master/blake2
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2019-0019.html

Frequently Asked Questions

What is CVE-2019-16143?
CVE-2019-16143 is a security vulnerability in Blake2 involving Algorithms compute incorrect results in blake2 under CWE-327: Use of a Broken or Risky Cryptographic Algorithm.
Which Blake2 versions are affected?
Affected versions include releases prior to 0.8.1 across affected packages: blake2.
What version fixes CVE-2019-16143?
Upgrading to 0.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is blake2 affected?
Yes, blake2 is affected in releases prior to 0.8.1. Upgrade your dependency to 0.8.1 or later.
What is the CVSS score of CVE-2019-16143?
CVE-2019-16143 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-16143?
CVE-2019-16143 is classified under CWE-327: Use of a Broken or Risky Cryptographic Algorithm (The product uses a broken or risky cryptographic algorithm or protocol.).
How can I check crates.io dependencies for CVE-2019-16143?
Run the dependency tree command: 'inspect dependencies for blake2'. 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-4x25-pvhw-5224",
  "modified" : "2023-06-13T16:41:15Z",
  "published" : "2021-08-25T20:44:20Z",
  "aliases" : [ "CVE-2019-16143" ],
  "summary" : "Algorithms compute incorrect results in blake2",
  "details" : "An issue was discovered in the blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "blake2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-16143"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/RustCrypto/MACs/issues/19"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/RustCrypto/hashes/tree/master/blake2"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2019-0019.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-327" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:22:54Z",
    "nvd_published_at" : "2019-09-09T12:15:00Z"
  }
}