CVE-2021-20682: Baserproject/basercms OS Command Injection Vulnerability

HIGH
Advisory Identifier: GHSA-g39q-f4rm-85x4
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CVSS 7.2
CWE-78
Published
Advisory Summary

CVE-2021-20682 is a HIGH (CVSS 7.2) os command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Baserproject/basercms libraries in the Packagist ecosystem. The issue involves os command injection in basercms. Remediation is available by upgrading affected packages to version 4.4.5.

CVE-2021-20682 at a Glance

CVE Identifier CVE-2021-20682
GHSA Identifier GHSA-g39q-f4rm-85x4
Severity HIGH
CVSS v3.1 Base Score 7.2
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Baserproject/basercms
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-2021-20682

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

baserproject/basercms fixed: 4.4.5 
Upgrade baserproject/basercms to 4.4.5
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 baserproject/basercms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-20682, inspect your project dependencies for Baserproject/basercms:

inspect dependencies for baserproject/basercms

Analyze the terminal output to locate any version of Baserproject/basercms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.4.5), 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Baserproject/basercms, 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

baserCMS versions prior to 4.4.5 allows a remote attacker with an administrative privilege to execute arbitrary OS commands via upload of malicious plugins.

CVE-2021-20682 Affected Baserproject/basercms Versions

1 component(s)
Fixed Versions:
4.4.5
Product / Package Ecosystem Affected Versions Fixed Version
baserproject/basercms
 Packagist
< 4.4.5
4.4.5

References

NVD — CVE-2021-20682 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20682
Baserproject/basercms Security Information SECURITY
https://basercms.net/security/JVN64869876
jvn.jp/en/jp/jvn64869876/i... WEB
https://jvn.jp/en/jp/JVN64869876/index.html

Frequently Asked Questions

What is CVE-2021-20682?
CVE-2021-20682 is a security vulnerability in Baserproject/basercms involving OS Command Injection in baserCMS under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Baserproject/basercms versions are affected?
Affected versions include releases prior to 4.4.5 across affected packages: baserproject/basercms.
What version fixes CVE-2021-20682?
Upgrading to 4.4.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is baserproject/basercms affected?
Yes, baserproject/basercms is affected in releases prior to 4.4.5. Upgrade your dependency to 4.4.5 or later.
What is the CVSS score of CVE-2021-20682?
CVE-2021-20682 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-2021-20682?
CVE-2021-20682 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2021-20682?
Run the dependency tree command: 'inspect dependencies for baserproject/basercms'. 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-g39q-f4rm-85x4",
  "modified" : "2023-07-06T18:14:13Z",
  "published" : "2021-06-08T20:10:37Z",
  "aliases" : [ "CVE-2021-20682" ],
  "summary" : "OS Command Injection in baserCMS",
  "details" : "baserCMS versions prior to 4.4.5 allows a remote attacker with an administrative privilege to execute arbitrary OS commands via upload of malicious plugins.",
  "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" : "baserproject/basercms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.4.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-20682"
  }, {
    "type" : "WEB",
    "url" : "https://basercms.net/security/JVN64869876"
  }, {
    "type" : "WEB",
    "url" : "https://jvn.jp/en/jp/JVN64869876/index.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-29T22:37:23Z",
    "nvd_published_at" : "2021-03-26T09:15:00Z"
  }
}