CVE-2019-10909: Symfony/symfony Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-g996-q5r8-w7g2
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2019-10909 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Symfony/symfony libraries in the Packagist ecosystem. The issue involves symfony cross-site scripting (xss) vulnerability. Remediation is available by upgrading affected packages to version 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7, 8.5.15, 8.6.15.

CVE-2019-10909 at a Glance

CVE Identifier CVE-2019-10909
GHSA Identifier GHSA-g996-q5r8-w7g2
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Symfony/symfony
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

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

How to Fix CVE-2019-10909

To remediate this vulnerability, upgrade all affected Symfony/symfony 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/symfony fixed: 2.7.51 
Upgrade symfony/symfony to 2.7.51
symfony/symfony fixed: 2.8.50 
Upgrade symfony/symfony to 2.8.50
symfony/symfony fixed: 3.4.26 
Upgrade symfony/symfony to 3.4.26
symfony/symfony fixed: 4.1.12 
Upgrade symfony/symfony to 4.1.12
symfony/symfony fixed: 4.2.7 
Upgrade symfony/symfony to 4.2.7
symfony/framework-bundle fixed: 2.7.51 
Upgrade symfony/framework-bundle to 2.7.51
symfony/framework-bundle fixed: 2.8.50 
Upgrade symfony/framework-bundle to 2.8.50
symfony/framework-bundle fixed: 3.4.26 
Upgrade symfony/framework-bundle to 3.4.26
symfony/framework-bundle fixed: 4.1.12 
Upgrade symfony/framework-bundle to 4.1.12
symfony/framework-bundle fixed: 4.2.7 
Upgrade symfony/framework-bundle to 4.2.7
drupal/core fixed: 8.5.15 
Upgrade drupal/core to 8.5.15
drupal/core fixed: 8.6.15 
Upgrade drupal/core to 8.6.15
drupal/drupal fixed: 8.5.15 
Upgrade drupal/drupal to 8.5.15
drupal/drupal fixed: 8.6.15 
Upgrade drupal/drupal to 8.6.15
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/symfony

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-10909, inspect your project dependencies for Symfony/symfony:

inspect dependencies for symfony/symfony

Analyze the terminal output to locate any version of Symfony/symfony in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.7.51), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Symfony/symfony, 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

In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, validation messages are not escaped, which can lead to XSS when user input is included. This is related to symfony/framework-bundle.

CVE-2019-10909 Affected Symfony/symfony Versions

14 component(s)
Fixed Versions:
2.7.512.8.503.4.264.1.124.2.78.5.158.6.15
Product / Package Ecosystem Affected Versions Fixed Version
symfony/symfony
 Packagist
≥ 2.7.0
< 2.7.51
2.7.51
symfony/symfony
 Packagist
≥ 2.8.0
< 2.8.50
2.8.50
symfony/symfony
 Packagist
≥ 3.0.0
< 3.4.26
3.4.26
symfony/symfony
 Packagist
≥ 4.0.0
< 4.1.12
4.1.12
symfony/symfony
 Packagist
≥ 4.2.0
< 4.2.7
4.2.7
symfony/framework-bundle
 Packagist
≥ 2.7.0
< 2.7.51
2.7.51
symfony/framework-bundle
 Packagist
≥ 2.8.0
< 2.8.50
2.8.50
symfony/framework-bundle
 Packagist
≥ 3.0.0
< 3.4.26
3.4.26
symfony/framework-bundle
 Packagist
≥ 4.0.0
< 4.1.12
4.1.12
symfony/framework-bundle
 Packagist
≥ 4.2.0
< 4.2.7
4.2.7
drupal/core
 Packagist
≥ 8.0.0
< 8.5.15
8.5.15
drupal/core
 Packagist
≥ 8.6.0
< 8.6.15
8.6.15
drupal/drupal
 Packagist
≥ 8.0.0
< 8.5.15
8.5.15
drupal/drupal
 Packagist
≥ 8.6.0
< 8.6.15
8.6.15

References

NVD — CVE-2019-10909 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-10909
Security Fix Commit FIX COMMIT
https://github.com/symfony/symfony/commit/ab4d05358c3d0dd1a36fc8c306829f68e3dd84e2
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2019-10909.yaml
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2019-10909.yaml
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/framework-bundle/CVE-2019-10909.yaml
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-10909.yaml
symfony.com/blog/cve-2019-10909... WEB
https://symfony.com/blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine
symfony.com/cve-2019-10909 WEB
https://symfony.com/cve-2019-10909
www.drupal.org/sa-core-2019-005 WEB
https://www.drupal.org/sa-core-2019-005
Symfony/symfony Security Information SECURITY
https://www.synology.com/security/advisory/Synology_SA_19_19

Frequently Asked Questions

What is CVE-2019-10909?
CVE-2019-10909 is a security vulnerability in Symfony/symfony involving Symfony Cross-site Scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Symfony/symfony versions are affected?
Affected versions include releases prior to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7, 8.5.15, 8.6.15 across affected packages: symfony/symfony, symfony/framework-bundle, drupal/core, drupal/drupal.
What version fixes CVE-2019-10909?
Upgrading to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7, 8.5.15, 8.6.15 (or the latest patched release for your respective branch) resolves the vulnerability.
Is symfony/symfony affected?
Yes, symfony/symfony is affected in releases prior to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7. Upgrade your dependency to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7 or later.
Is symfony/framework-bundle affected?
Yes, symfony/framework-bundle is affected in releases prior to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7. Upgrade your dependency to 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7 or later.
What is the CVSS score of CVE-2019-10909?
CVE-2019-10909 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2019-10909?
CVE-2019-10909 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2019-10909?
Run the dependency tree command: 'inspect dependencies for symfony/symfony'. 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-g996-q5r8-w7g2",
  "modified" : "2024-02-14T15:22:38Z",
  "published" : "2019-11-12T23:00:53Z",
  "aliases" : [ "CVE-2019-10909" ],
  "summary" : "Symfony Cross-site Scripting (XSS) vulnerability",
  "details" : "In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, validation messages are not escaped, which can lead to XSS when user input is included. This is related to symfony/framework-bundle.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-10909"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/commit/ab4d05358c3d0dd1a36fc8c306829f68e3dd84e2"
  }, {
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    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2019-10909.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2019-10909.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/framework-bundle/CVE-2019-10909.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-10909.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2019-10909"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2019-005"
  }, {
    "type" : "WEB",
    "url" : "https://www.synology.com/security/advisory/Synology_SA_19_19"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-11-12T16:48:32Z",
    "nvd_published_at" : "2019-05-16T22:29:00Z"
  }
}