CVE-2021-41824: Craftcms/cms CSV Injection Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-h7vq-5qgw-jwwq
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CVSS 8.8
CWE-1236
Published
Advisory Summary

CVE-2021-41824 is a HIGH (CVSS 8.8) csv injection vulnerability vulnerability (CWE-1236: Improper Neutralization of Formula Elements in a CSV File) affecting Craftcms/cms libraries in the Packagist ecosystem. The issue involves csv injection vulnerability. Remediation is available by upgrading affected packages to version 3.7.14.

CVE-2021-41824 at a Glance

CVE Identifier CVE-2021-41824
GHSA Identifier GHSA-h7vq-5qgw-jwwq
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-1236: Improper Neutralization of Formula Elements in a CSV File
Affected Product Craftcms/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-41824

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

craftcms/cms fixed: 3.7.14 
Upgrade craftcms/cms to 3.7.14
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 craftcms/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-41824, inspect your project dependencies for Craftcms/cms:

inspect dependencies for craftcms/cms

Analyze the terminal output to locate any version of Craftcms/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.7.14), 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-1236: Improper Neutralization of Formula Elements in a CSV File, where the product saves user-provided information into a comma-separated value (csv) file, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as a command when the file is opened by a spreadsheet product. In Craftcms/cms, 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

### Impact In some circumstances, it was possible to export data in CSV format that could trigger a payload in old versions of Excel. If you are accepting user input from untrusted sources and will be exporting that data in CSV format from element index pages and there is a chance users will open that on old versions of Excel, then you should update. ### Patches This has been patched in Craft 3.7.14. ### References * https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#3714---2021-09-28 * https://twitter.com/craftcmsupdates/status/1442928690145366018 ### For more information If you have any questions or comments about this advisory, email us at support@craftcms.com ---------- Credits: BAE Systems AI Vulnerability Research Team – Azrul Ikhwan Zulkifli

CVE-2021-41824 Affected Craftcms/cms Versions

1 component(s)
Fixed Versions:
3.7.14
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
≥ 3.4.0
< 3.7.14
3.7.14

References

GitHub Advisory / Wiki ADVISORY
https://github.com/craftcms/cms/security/advisories/GHSA-h7vq-5qgw-jwwq
NVD — CVE-2021-41824 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41824
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/c9cb2225f1b908fb1e8401d401219228634b26b2
Craftcms/cms Source Repository REPOSITORY
https://github.com/craftcms/cms
Craftcms/cms Source Repository REPOSITORY
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#3714---2021-09-28
twitter.com/craftcmsupdates/sta... WEB
https://twitter.com/craftcmsupdates/status/1442928690145366018

Frequently Asked Questions

What is CVE-2021-41824?
CVE-2021-41824 is a security vulnerability in Craftcms/cms involving CSV Injection Vulnerability under CWE-1236: Improper Neutralization of Formula Elements in a CSV File.
Which Craftcms/cms versions are affected?
Affected versions include releases prior to 3.7.14 across affected packages: craftcms/cms.
What version fixes CVE-2021-41824?
Upgrading to 3.7.14 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftcms/cms affected?
Yes, craftcms/cms is affected in releases prior to 3.7.14. Upgrade your dependency to 3.7.14 or later.
What is the CVSS score of CVE-2021-41824?
CVE-2021-41824 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-41824?
CVE-2021-41824 is classified under CWE-1236: Improper Neutralization of Formula Elements in a CSV File (The product saves user-provided information into a Comma-Separated Value (CSV) file, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as a command when the file is opened by a spreadsheet product.).
How can I check Packagist dependencies for CVE-2021-41824?
Run the dependency tree command: 'inspect dependencies for craftcms/cms'. 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-h7vq-5qgw-jwwq",
  "modified" : "2021-10-18T19:11:00Z",
  "published" : "2021-10-18T19:04:16Z",
  "aliases" : [ "CVE-2021-41824" ],
  "summary" : "CSV Injection Vulnerability",
  "details" : "### Impact\nIn some circumstances, it was possible to export data in CSV format that could trigger a payload in old versions of Excel.\n\nIf you are accepting user input from untrusted sources and will be exporting that data in CSV format from element index pages and there is a chance users will open that on old versions of Excel, then you should update.\n\n### Patches\nThis has been patched in Craft 3.7.14.\n\n### References\n* https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#3714---2021-09-28\n* https://twitter.com/craftcmsupdates/status/1442928690145366018\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at support@craftcms.com\n\n----------\n\nCredits: BAE Systems AI Vulnerability Research Team – Azrul Ikhwan Zulkifli",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.4.0"
      }, {
        "fixed" : "3.7.14"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-h7vq-5qgw-jwwq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41824"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/c9cb2225f1b908fb1e8401d401219228634b26b2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#3714---2021-09-28"
  }, {
    "type" : "WEB",
    "url" : "https://twitter.com/craftcmsupdates/status/1442928690145366018"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1236" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-15T17:36:16Z",
    "nvd_published_at" : "2021-09-30T00:15:00Z"
  }
}