CVE-2020-1026: Msrcrypto Incorrect Calculation Vulnerability

HIGH
Advisory Identifier: GHSA-9x9j-836w-8f55
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CVSS 9.8
CWE-682
Published
Advisory Summary

CVE-2020-1026 is a HIGH (CVSS 9.8) incorrect calculation vulnerability (CWE-682: Incorrect Calculation) affecting Msrcrypto libraries in the npm ecosystem. The issue involves incorrect calculation in the msr javascript cryptography library. Remediation is available by upgrading affected packages to version 1.5.8.

CVE-2020-1026 at a Glance

CVE Identifier CVE-2020-1026
GHSA Identifier GHSA-9x9j-836w-8f55
Severity HIGH
CVSS v3.1 Base Score 9.8
CWE Classification CWE-682: Incorrect Calculation
Affected Product Msrcrypto
Package Ecosystem npm
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-2020-1026

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

msrcrypto fixed: 1.5.8 
npm install msrcrypto@1.5.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls msrcrypto

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-1026, inspect your project dependencies using npm:

npm ls msrcrypto

Analyze the terminal output to locate any version of Msrcrypto in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.8), your application is affected.

Note: The npm ls msrcrypto command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-682: Incorrect Calculation, where the product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. In Msrcrypto, 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

A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library's Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a server's private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid.The security update addresses the vulnerability by fixing the bugs disclosed in the ECC implementation, aka `MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability`.

CVE-2020-1026 Affected Msrcrypto Versions

1 component(s)
Fixed Versions:
1.5.8
Product / Package Ecosystem Affected Versions Fixed Version
msrcrypto
npm/msrcrypto
npm
< 1.5.8
1.5.8

References

NVD — CVE-2020-1026 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1026
Msrcrypto Security Information SECURITY
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026

Frequently Asked Questions

What is CVE-2020-1026?
CVE-2020-1026 is a security vulnerability in Msrcrypto involving Incorrect Calculation in the MSR JavaScript Cryptography Library under CWE-682: Incorrect Calculation.
Which Msrcrypto versions are affected?
Affected versions include releases prior to 1.5.8 across affected packages: msrcrypto.
What version fixes CVE-2020-1026?
Upgrading to 1.5.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is msrcrypto affected?
Yes, msrcrypto is affected in releases prior to 1.5.8. Upgrade your dependency to 1.5.8 or later.
What is the CVSS score of CVE-2020-1026?
CVE-2020-1026 has a CVSS v3.1 base score of 9.8 (HIGH) 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-2020-1026?
CVE-2020-1026 is classified under CWE-682: Incorrect Calculation (The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.).
How can I check npm dependencies for CVE-2020-1026?
Run the dependency tree command: 'npm ls msrcrypto'. 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-9x9j-836w-8f55",
  "modified" : "2021-10-20T22:19:13Z",
  "published" : "2022-01-06T19:44:01Z",
  "aliases" : [ "CVE-2020-1026" ],
  "summary" : "Incorrect Calculation in the MSR JavaScript Cryptography Library",
  "details" : "A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library's Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a server's private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid.The security update addresses the vulnerability by fixing the bugs disclosed in the ECC implementation, aka `MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability`.",
  "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" : "npm",
      "name" : "msrcrypto"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-1026"
  }, {
    "type" : "WEB",
    "url" : "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-682" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T19:19:10Z",
    "nvd_published_at" : "2020-04-15T15:15:00Z"
  }
}