CVE-2021-32693: Symfony/security http Authentication Granted To All Firewalls Vulnerability

MODERATE
Advisory Identifier: GHSA-rfcf-m67m-jcrq
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CVSS 6.8
CWE-287
Published
Advisory Summary

CVE-2021-32693 is a MODERATE (CVSS 6.8) authentication granted to all firewalls vulnerability (CWE-287: Improper Authentication) affecting Symfony/security http libraries in the Packagist ecosystem. The issue involves authentication granted to all firewalls instead of just one. Remediation is available by upgrading affected packages to version 5.3.2.

CVE-2021-32693 at a Glance

CVE Identifier CVE-2021-32693
GHSA Identifier GHSA-rfcf-m67m-jcrq
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-287: Improper Authentication
Affected Product Symfony/security http
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.8

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

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

How to Fix CVE-2021-32693

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

symfony/security-http fixed: 5.3.2 
Upgrade symfony/security-http to 5.3.2
symfony/symfony fixed: 5.3.2 
Upgrade symfony/symfony to 5.3.2
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 symfony/security-http

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-32693, inspect your project dependencies for Symfony/security http:

inspect dependencies for symfony/security-http

Analyze the terminal output to locate any version of Symfony/security http in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.3.2), 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-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Symfony/security http, 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

Description ----------- When an application defines multiple firewalls, the authenticated token delivered by one of the firewalls is available to all other firewalls. This can be abused when the application defines different providers for different parts of an application. In such a situation, a user authenticated on one part of the application is considered authenticated on the whole application. Resolution ---------- We now ensure that the authenticated token is only available for the firewall that generates it. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/3084764ad82f29dbb025df19978b9cbc3ab34728) for branch 5.3. Credits ------- I would like to thank Bogdan, gndk, Paweł Warchoł, Warxcell, and Adrien Lamotte for reporting the issue and Wouter J for fixing the issue.

CVE-2021-32693 Affected Symfony/security http Versions

2 component(s)
Fixed Versions:
5.3.2
Product / Package Ecosystem Affected Versions Fixed Version
symfony/security-http
 Packagist
≥ 5.3.0
< 5.3.2
5.3.2
symfony/symfony
 Packagist
≥ 5.3.0
< 5.3.2
5.3.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/symfony/symfony/security/advisories/GHSA-rfcf-m67m-jcrq
NVD — CVE-2021-32693 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32693
Security Fix Commit FIX COMMIT
https://github.com/symfony/security-http/commit/6bf4c31219773a558b019ee12e54572174ff8129
Security Fix Commit FIX COMMIT
https://github.com/symfony/symfony/commit/3084764ad82f29dbb025df19978b9cbc3ab34728
Symfony/security http Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-32693.yaml
Symfony/security http Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-32693.yaml
Symfony/security http Source Repository REPOSITORY
https://github.com/symfony/security-http
symfony.com/blog/cve-2021-32693... WEB
https://symfony.com/blog/cve-2021-32693-authentication-granted-to-all-firewalls-instead-of-just-one
symfony.com/cve-2021-32693 WEB
https://symfony.com/cve-2021-32693

Frequently Asked Questions

What is CVE-2021-32693?
CVE-2021-32693 is a security vulnerability in Symfony/security http involving Authentication granted to all firewalls instead of just one under CWE-287: Improper Authentication.
Which Symfony/security http versions are affected?
Affected versions include releases prior to 5.3.2 across affected packages: symfony/security-http, symfony/symfony.
What version fixes CVE-2021-32693?
Upgrading to 5.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is symfony/security-http affected?
Yes, symfony/security-http is affected in releases prior to 5.3.2. Upgrade your dependency to 5.3.2 or later.
Is symfony/symfony affected?
Yes, symfony/symfony is affected in releases prior to 5.3.2. Upgrade your dependency to 5.3.2 or later.
What is the CVSS score of CVE-2021-32693?
CVE-2021-32693 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2021-32693?
CVE-2021-32693 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Packagist dependencies for CVE-2021-32693?
Run the dependency tree command: 'inspect dependencies for symfony/security-http'. 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-rfcf-m67m-jcrq",
  "modified" : "2024-02-05T11:13:38Z",
  "published" : "2021-06-21T17:03:44Z",
  "aliases" : [ "CVE-2021-32693" ],
  "summary" : "Authentication granted to all firewalls instead of just one",
  "details" : "Description\n-----------\n\nWhen an application defines multiple firewalls, the authenticated token delivered by one of the firewalls is available to all other firewalls. This can be abused when the application defines different providers for different parts of an application. In such a situation, a user authenticated on one part of the application is considered authenticated on the whole application.\n\nResolution\n----------\n\nWe now ensure that the authenticated token is only available for the firewall that generates it.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/3084764ad82f29dbb025df19978b9cbc3ab34728) for branch 5.3.\n\nCredits\n-------\n\nI would like to thank Bogdan, gndk, Paweł Warchoł, Warxcell, and Adrien Lamotte for reporting the issue and Wouter J for fixing the issue.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/security-http"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.3.0"
      }, {
        "fixed" : "5.3.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.3.0"
      }, {
        "fixed" : "5.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/security/advisories/GHSA-rfcf-m67m-jcrq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32693"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/security-http/commit/6bf4c31219773a558b019ee12e54572174ff8129"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/commit/3084764ad82f29dbb025df19978b9cbc3ab34728"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-32693.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-32693.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/symfony/security-http"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/blog/cve-2021-32693-authentication-granted-to-all-firewalls-instead-of-just-one"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2021-32693"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-06-18T20:33:08Z",
    "nvd_published_at" : "2021-06-17T23:15:00Z"
  }
}