CVE-2020-9588: Magento/community edition Magento Signature Verification Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-j2r4-2cr6-h3r3
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CVSS 7.2
CWE-203
Published
Advisory Summary

CVE-2020-9588 is a HIGH (CVSS 7.2) magento signature verification bypass vulnerability (CWE-203: Observable Discrepancy) affecting Magento/community edition libraries in the Packagist ecosystem. The issue involves magento signature verification bypass. Remediation is available by upgrading affected packages to version 2.3.4-p2, 1.9.4.5.

CVE-2020-9588 at a Glance

CVE Identifier CVE-2020-9588
GHSA Identifier GHSA-j2r4-2cr6-h3r3
Severity HIGH
CVSS v3.1 Base Score 7.2
CWE Classification CWE-203: Observable Discrepancy
Affected Product Magento/community edition
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.2

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2020-9588

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: 2.3.4-p2 
Upgrade magento/community-edition to 2.3.4-p2
magento/core fixed: 1.9.4.5 
Upgrade magento/core to 1.9.4.5
magento/project-community-edition fixed: Latest secure release 
Upgrade magento/project-community-edition 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 magento/community-edition

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-9588, 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 2.3.4-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 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.

CVE-2020-9588 Affected Magento/community edition Versions

3 component(s)
Fixed Versions:
2.3.4-p21.9.4.5
Product / Package Ecosystem Affected Versions Fixed Version
magento/community-edition
 Packagist
< 2.3.4-p2
2.3.4-p2
magento/core
 Packagist
< 1.9.4.5
1.9.4.5
magento/project-community-edition
 Packagist
≤ 2.0.2

References

NVD — CVE-2020-9588 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-9588
Magento/community edition Security Information SECURITY
https://helpx.adobe.com/security/products/magento/apsb20-22.html

Frequently Asked Questions

What is CVE-2020-9588?
CVE-2020-9588 is a security vulnerability in Magento/community edition involving Magento Signature verification bypass under CWE-203: Observable Discrepancy.
Which Magento/community edition versions are affected?
Affected versions include releases prior to 2.3.4-p2, 1.9.4.5 across affected packages: magento/community-edition, magento/core, magento/project-community-edition.
What version fixes CVE-2020-9588?
Upgrading to 2.3.4-p2, 1.9.4.5 (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 2.3.4-p2. Upgrade your dependency to 2.3.4-p2 or later.
Is magento/core affected?
Yes, magento/core is affected in releases prior to 1.9.4.5. Upgrade your dependency to 1.9.4.5 or later.
What is the CVSS score of CVE-2020-9588?
CVE-2020-9588 has a CVSS v3.1 base score of 7.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-9588?
CVE-2020-9588 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-2020-9588?
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-j2r4-2cr6-h3r3",
  "modified" : "2025-02-10T20:30:10Z",
  "published" : "2022-05-24T17:21:49Z",
  "aliases" : [ "CVE-2020-9588" ],
  "summary" : "Magento Signature verification bypass",
  "details" : "Magento versions 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 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:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/community-edition"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.4-p2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.4.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/project-community-edition"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-9588"
  }, {
    "type" : "WEB",
    "url" : "https://helpx.adobe.com/security/products/magento/apsb20-22.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-203" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-10T23:18:37Z",
    "nvd_published_at" : "2020-06-26T21:15:00Z"
  }
}