CVE-2020-9690: Magento/community edition Magento Observable Timing Discrepancy Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-xgp9-j48h-jjf9
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CVSS 4.2
CWE-203
Published
Advisory Summary

CVE-2020-9690 is a MODERATE (CVSS 4.2) magento observable timing discrepancy vulnerability vulnerability (CWE-203: Observable Discrepancy) affecting Magento/community edition libraries in the Packagist ecosystem. The issue involves magento observable timing discrepancy vulnerability. Remediation is available by upgrading affected packages to version 2.3.5-p2.

CVE-2020-9690 at a Glance

CVE Identifier CVE-2020-9690
GHSA Identifier GHSA-xgp9-j48h-jjf9
Severity MODERATE
CVSS v3.1 Base Score 4.2
CWE Classification CWE-203: Observable Discrepancy
Affected Product Magento/community edition
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.2

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2020-9690

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

magento/community-edition fixed: 2.3.5-p2 
Upgrade magento/community-edition to 2.3.5-p2
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 magento/community-edition

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-9690, inspect your project dependencies for Magento/community edition:

inspect dependencies for magento/community-edition

Analyze the terminal output to locate any version of Magento/community edition in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.5-p2), 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-203: Observable Discrepancy, where the product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor. In Magento/community edition, 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

Magento versions 2.3.5-p1 and earlier, and 2.3.5-p1 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.

CVE-2020-9690 Affected Magento/community edition Versions

1 component(s)
Fixed Versions:
2.3.5-p2
Product / Package Ecosystem Affected Versions Fixed Version
magento/community-edition
 Packagist
< 2.3.5-p2
2.3.5-p2

References

NVD — CVE-2020-9690 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-9690
Security Fix Commit FIX COMMIT
https://github.com/magento/magento2/commit/9436781734e47c83e96977fa770d255217680d5e
Magento/community edition Source Repository REPOSITORY
https://github.com/magento/magento2
Magento/community edition Security Information SECURITY
https://helpx.adobe.com/security/products/magento/apsb20-47.html

Frequently Asked Questions

What is CVE-2020-9690?
CVE-2020-9690 is a security vulnerability in Magento/community edition involving Magento observable timing discrepancy vulnerability under CWE-203: Observable Discrepancy.
Which Magento/community edition versions are affected?
Affected versions include releases prior to 2.3.5-p2 across affected packages: magento/community-edition.
What version fixes CVE-2020-9690?
Upgrading to 2.3.5-p2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is magento/community-edition affected?
Yes, magento/community-edition is affected in releases prior to 2.3.5-p2. Upgrade your dependency to 2.3.5-p2 or later.
What is the CVSS score of CVE-2020-9690?
CVE-2020-9690 has a CVSS v3.1 base score of 4.2 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2020-9690?
CVE-2020-9690 is classified under CWE-203: Observable Discrepancy (The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.).
How can I check Packagist dependencies for CVE-2020-9690?
Run the dependency tree command: 'inspect dependencies for magento/community-edition'. 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-xgp9-j48h-jjf9",
  "modified" : "2024-01-11T17:45:10Z",
  "published" : "2022-05-24T17:24:41Z",
  "aliases" : [ "CVE-2020-9690" ],
  "summary" : "Magento observable timing discrepancy vulnerability",
  "details" : "Magento versions 2.3.5-p1 and earlier, and 2.3.5-p1 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/community-edition"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.5-p2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-9690"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/magento/magento2/commit/9436781734e47c83e96977fa770d255217680d5e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/magento/magento2"
  }, {
    "type" : "WEB",
    "url" : "https://helpx.adobe.com/security/products/magento/apsb20-47.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-203" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-11T17:45:10Z",
    "nvd_published_at" : "2020-07-29T13:15:00Z"
  }
}